We provide hydrogen practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on hydrogen skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of hydrogen Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Hydrogen peroxide is obtained by the electrolysis of: A. water B. sulphuric acid C. hydrochloric acid D. fused sodium peroxide |
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| 2 | Which of the following is/are true regarding hydrogen economy? This question has multiple correct options A. Hydrogen economy refers to technique of using dihydrogen in an efficient way. B. Dihydrogen is transproted and stored in the form of liquid or gas. C. Dihydrogen is ecofriendly and releases more energy than petrol. D. Hydrogen economy refers to the transmission of this energy in the form of dihydrogen. |
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| 3 | Hydrogen finds a place in VII A group of periodic table because A. it is a light element B. ( H- ) atom has only one electron in its valence shell C. it forms hydride of the type ( N a H ) D. it has 7 isotopes |
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| 4 | Water in its pure form is a: A. good conductor of heat B. bad conductor of electricity c. good conductor of electricity D. none of these |
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| 5 | Hydrogen peroxide acts both as an oxidising and as a reducing agent, depending upon the nature of the reacting species. In which of the following cases ( H_{2} O_{2} ) acts as a reducing agent in acid medium? A. ( M n O_{4} ) B. ( C r_{2} O_{7}^{2} ) ( mathbf{c} cdot S O_{3}^{2} ) D. ( K I ) |
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| 6 | Hydrogen is a good reducing agent What do you understand by the above statement? | 11 |
| 7 | Acid when reacts with metal release hydrogen gas but there is one acid which when reacts with metal does not release hydrogen except for two metals. Prove this statement. |
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| 8 | A small amount of ( M n O_{2} ) is added to ( H_{2} O ) taken in a test tube (a) Suggest an experiment to identify the gas liberated. (b) Write the chemical equation of the reaction taking place. (c) What is the role of ( M n O_{2} ) in this chemical reaction? |
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| 9 | What do you understand by electron rich compounds of hydrogen. |
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| 10 | Tritium contains A .4 B. 3 ( c cdot 2 ) D. |
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| 11 | The half reaction which correctly represents the change that takes place in the reaction between ( H_{2} O_{2} ) and alkaline potassium ferricyanide is? A ( cdot H_{2} O_{2}+2 H^{+}+2 e^{-} rightarrow 2 H_{2} O ) в. ( H_{2} O_{2} rightarrow 2 H^{-}+O_{2}+2 e^{-} ) c. ( H_{2} O_{2} rightarrow 2 H^{-}+O_{2}+2 H_{2} O+2 e^{-} ) D. ( H_{2} O_{2}+2 e^{-} rightarrow 2 O H ) |
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| 12 | Which of the following process is not used in the concentration of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) ? A. Distillation under reduced pressure B. Evaporation on a water bath c. Fractional crystallization D. Sublimation |
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| 13 | Hydrogen peroxide molecules are: A. monoatomic and form ( X_{2}^{2-} ) ions B. diatomic and form ( X^{-} ) ions C . diatomic and form ( H O_{2}^{-} ) ions D. monoatomic and form ( X^{-} ) ions |
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| 14 | Q6. Complete the following reactions. (1) H (8) + Mnog(s) (ii) CO(g) + H,(g) Catalyst (iii) CHg(8) + 3H,0(8) Catalyst heat (iv) Zn(s) + NaOH(aq) |
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| 15 | The energy stored in water formed from ice is: This question has multiple correct options A. Latent heat of fusion of ice B. ( 80 c a l^{-1} ) c. Latent heat of boiling D. Latent heat of fusion of water |
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| 16 | Permanent hardness of water cannot be removed by: A. washing soda method. B. permutit method c. ion exchange method. D. boiling |
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| 17 | Hydrogen can be produced by: This question has multiple correct options A . electrolysis of water B. distillation of air C . steam methane reforming process D. evaporation of water |
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| 18 | Duo 25 Q16. Arrange the following: (i) CaH, BeH, and TiH, in order of increasing electrical conductance. (1) LIH, NaH and CsH in order of increasing ionic character. (iii) H-H, D-D and F-F in order of increasing bond dissociation enthalpy. (iv) NaH, MgH, and H,O in order of increasing reducing property. |
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| 19 | The product(s) formed when ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) reacts with disodium hydrogen phosphate is: A ( cdot P_{2} O_{5} cdot N a_{3} P O_{4} ) в. ( N a_{2} H P O_{4} . H_{2} O_{2} ) c. ( operatorname{NaH}_{2} P O_{4}, H_{2} O ) D. ( N a_{2} H P O_{4} cdot H_{2} O ) |
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| 20 | Which of the following given element has one electron, one proton and no neutron? ( mathbf{A} cdot H ) в. ( L ) i c. ( C l ) D. ( H ) |
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| 21 | Hydrogen is present in the air in traces but in sun and stars to a maximum. Explain. |
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| 22 | Under the same conditions of pressure and temperature, which property is the same for ( boldsymbol{H}_{2} ) and ( boldsymbol{D}_{2} ? ) A. rate of reaction with other substances B. average kinetic energy per mole c. most probable velocity D. maximum density |
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| 23 | ( H_{2} O_{2} ) restores the colour of old lead paintings, blackened by the action of ( H_{2} S ) gas by: A . converting ( P b O_{2} ) to ( P b ) B. by oxidising ( P b S ) to ( P b S O_{4} ) C. converting ( P b C O_{3} ) to ( P b ) D. oxidising ( P b S O_{3} ) to ( P b S O_{4} ) |
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| 24 | Heavy water is used as a: A. fuel in engines B. semiconductor c. moderator in nuclear reactors D. insulator in steam engines |
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| 25 | Heavy water is used in atomic reactor as: A. coolant B. moderator c. both coolant and moderator D. neither coolant nor moderator |
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| 26 | Which of the following have peroxy linkages? This question has multiple correct options A. ( H_{2} T i O_{4} ) в. ( O s O_{4} ) c. ( K_{2} C r_{2} O_{7} ) D. ( C r O_{5} ) |
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| 27 | Radioactive elements emit ( alpha, beta ) and ( gamma ) rays are characterized by their halflives. The radioactive isotope of hydrogen is: A. protium B. deuterium c. tritium D. hydronium |
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| 28 | Heavy water is not used for drinking because: A. it is poisonous B. it is costly c. its physiological action is different from ordinary water D. its chemical properties different from ordinary water |
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| 29 | Which of the following can not be oxidised by ( H_{2} O_{2} ? ) A. Pbs в. к।+нс c. ( N a_{2} S O_{3} ) D. ( O_{3} ) |
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| 30 | Assertion Permanent hardness of water can be removed by using washing soda Reason Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form |
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| 31 | The molecular formula of heavy water is: A ( cdot D_{3} O ) в. ( D_{2} ), c. ( D O ) D. ( D O_{2} ) |
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| 32 | Which of the following is a universal solvent? A. water B. alcohol c. acetic acid D. both A and |
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| 33 | What is the physical state of water at ( mathbf{0}^{circ} boldsymbol{C} ? ) |
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| 34 | ( H_{2} O_{2} ) can be obtained when following react with ( H_{2} S O_{4} ) except with: A ( cdot P b O_{2} ) в. ( B a O_{2} ) c. ( N a_{2} O_{2} ) D. ( K O_{2} ) |
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| 35 | Heavy water ( left(D_{2} Oright) ) freezes at ( ? ) A . ( -3.8^{0} mathrm{C} ) B . ( 3.8^{circ} mathrm{C} ) ( c cdot 0^{0} C ) D. ( 38^{circ} mathrm{C} ) |
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| 36 | One litre of a sample of hard water contains ( 55.5 mathrm{mg} ) of ( mathrm{CaCl}_{2} ) and ( 4.75 mathrm{mg} ) of ( M g C l_{2} . ) The total harness in terms of ppm of ( C a C O_{3} ) is : ( A cdot 9 ) ppm B. 10 ppm c. 20 ppm D. none of these |
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| 37 | Q. 46 Give reasons why hydrogen resembles alkali metals? | 11 |
| 38 | Q5. Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process? |
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| 39 | Hydrogen is the element on the earth. A. most abundant B. heaviest c. lightest D. none of these |
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| 40 | Hydrogen gas is prepared in the laboratory by reacting dilute ( H C l ) with granulated zinc. Following reaction takes place: ( Z n+2 H C l rightarrow Z n C l_{2}+H_{2} ) What would be the volume of hydrogen gas is liberated at STP when 32.65 g of zinc reacts with ( boldsymbol{H} boldsymbol{C l} ) ? A . ( 10.03 mathrm{L} ) B. 11.35 L c. ( 11.57 mathrm{L} ) D. 9.53 L |
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| 41 | ( H C l ) is added to the following oxides, which one would give ( H_{2} O_{2} ? ) ( mathbf{A} cdot B a O_{2} ) в. ( M n O_{2} ) ( mathbf{c} cdot P b O_{2} ) D. ( N O_{2} ) |
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| 42 | Excess of ( K I ) and dil. ( H_{2} S O_{4}, ) were ( operatorname{mixed} operatorname{in} 50 mathrm{ml} H_{2} O_{2} . ) The ( I_{2} ) liberated required ( 20 mathrm{ml} ) of ( 0.1 mathrm{N} mathrm{Na}_{2} mathrm{S}_{2} mathrm{O}_{3} ). Find out the strength of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) in ( boldsymbol{g} / boldsymbol{l} boldsymbol{i} boldsymbol{t}^{-1} ) ? A. ( 0.17 g / )lit B. ( 0.34 g / )lit c. ( 0.68 g / l i t ) D. ( 1.36 g / l i t ) |
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| 43 | Water contains hydrogen and oxygen in the ratio: A . 2: B. 1: ( c cdot 1: 4 ) D. 4: |
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| 44 | Statement 1: Water boils below ( 100^{circ} mathrm{C} ) at high altitudes. Statement 2: Atmospheric pressure varies inversely with altitude. A. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement B. Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1. c. statement 1 is correct but Statement 2 is not correct. D. Statement 1 is not correct but Statement 2 is correct E. Both the Statement 1 and Statement 2 are not correct |
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| 45 | Given below are two reaction of water with sodium and carbon dioxide, what is the nature of water in these reaction? ( (mathrm{i}) 2 N a+2 H_{2} O rightarrow 2 N a O H+H_{2} ) ( (mathrm{ii}) 6 mathrm{CO}_{2}+12 mathrm{H}_{2} mathrm{O} rightarrow mathrm{C}_{6} mathrm{H}_{1} 2_{6}+ ) ( mathbf{6} boldsymbol{H}_{2} boldsymbol{O}+mathbf{6} boldsymbol{O}_{2} ) A . In (ii) water acts as an oxidising agent and in (i) it acts as a reducing agent B. In (i) water acts as an oxidising agent and in (ii) it acts as a reducing agent c. In both (i) and (ii) hydrogen acts as a reducing agent D. In both (i) and (ii) hydrogen acts as an oxidizing agent |
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| 46 | The lightest element in the world is? A. Oxygen B. Helium c. Hydrogen D. Chlorine |
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| 47 | Zeolite used to soften hardness of water is, hydrated: A. Potassium aluminium borate B. Sodium aluminium silicate c. Calcium aluminium borate D. zinc aluminium borate |
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| 48 | What do you understand by (i) electron- deficient, (ii) electron-precise, and (iii) electron-rich compounds of hydrogen? |
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| 49 | Write the name of lightest element | 11 |
| 50 | Hydrogen behaves as a metal: A. at low temperature B. at low pressure c. at high temperature D. at high pressure |
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| 51 | Which of the following substances adsorbs ( boldsymbol{H}_{2} ) gas most strongly? A. Platinum black B. Nickel powder c. Activated charcoal D. silica gel |
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| 52 | The number of isotopes of hydrogen are: ( A cdot 2 ) B. ( c cdot 4 ) D. |
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| 53 | The reaction between ( H_{2} O_{2} ) and ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ) is ( boldsymbol{2} boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}+boldsymbol{3} boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4}+ ) ( mathbf{5} boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{K}_{2} boldsymbol{S} boldsymbol{O}_{4}+boldsymbol{2} boldsymbol{M} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4}+ ) ( 8 H_{2} O+5 O_{2} ) In a reaction excess of ( H_{2} O_{2} ) is added to 0.1 mole of acidified ( K M n O_{4} ) solution. Then the STP volume of ( O_{2} ) liberated is: A . 5.6 B. 6.6 c. ( 11.2 L ) D. 22.4 L |
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| 54 | Assertion Oxy hydrogen blow torch is used for welding. Reason The temperature produced here is above ( 2000^{circ} mathrm{C} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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| 55 | ( boldsymbol{A}+boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{B}+boldsymbol{O}_{2} . ) In this reaction the role of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A. oxidant B. reductant ( c . ) both D. catalyst |
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| 56 | Which is not true for ( _{1} H^{1} ;_{1} H^{2} ;_{1} H^{3} ? ) A. They are isotopes of each other B. They have similar electronic configurations C. They exist in the nature in the ratio of 1: 2: 3 D. Their atomic masses are in the ratio of 1: 2: 3 |
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| 57 | Q. 37 How is heavy water prepared? Compare its physical properties with those of ordinary water. toromnarison of physical |
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| 58 | Hydrogen has the tendency to lose one electron and form ( boldsymbol{H}^{+} . ) In this respect, it resembles: A. alkali metals B. carbon c. alkaline earth metals D. halogens |
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| 59 | Which of the following will give ( boldsymbol{H}_{2} ) gas with dilute ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ? ) A. ( M g ) в. ( Z n ) c. ( C u ) D. ( H g ) |
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| 60 | Water is a mixture. A. True B. False |
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| 61 | 9. Water undergoes self-ionization to a small extent to give (a) H and OH (b) OH and H (c) H2O* and OH (d) none of the above |
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| 62 | Which property of water is used by plants for taking minerals from the soil? I) Water can form aqueous solutions. Il) Water can dissolve a wide variety of substances ( A ) B. I ( c cdot 1,1 ) D. none of the above |
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| 63 | Why is distilled water considered to be the purest form of water? |
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| 64 | Which of the following is not true? A. Ordinary water is electrolysed more rapidly than ( D_{2} O ) B. Reaction between ( H_{2} ) and ( C l_{2} ) is much faster than ( D_{2} ) and ( C l_{2} ) ( mathrm{C} cdot D_{2} mathrm{O} ) freezes at lower temperture than ( mathrm{H}_{2} mathrm{O} ) D. Bond dissociation energy for ( D_{2} ) is greater than ( H_{2} 1 ) |
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| 65 | Assertion Water is tested by using blue cobalt chloride paper. Reason Water turns blue cobalt chloride pink A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 66 | Match the above given table 4. A-3, B-1, C-5, D-2 B. A-1, B-2, C-3, D-4 c. ( A-4, B-1, C-5, D-2 ) D. A-2, B-1, C-3, D-4 |
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| 67 | Heavy water is: ( mathbf{A} cdot H_{2} O ) B. water obtained by repeated distillation ( c cdot D_{2} O ) D. water at ( 4^{circ} mathrm{C} ) |
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| 68 | Q. 33 Give reasons (i) Lakes freeze from top towards bottom. (ii) Ice floats on water. A D it then that of liquid water During severe winter th |
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| 69 | 0.30 Name the classes of hydrides to which H,O, B.Hg and NaH belong. ovelant or molecular budu |
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| 70 | Under what conditions of temperature and pressure, the formation of molecular hydrogen from atomic hydrogen will be favoured most? A. High temperature and high pressure B. Low temperature and low pressure c. High temperature and low pressure D. Low temperature and high pressure |
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| 71 | Hydrogen exists in atomic state in which of the following compounds? A. Metallic hydrides B. Ionic Hydride c. Molecular hydrides D. ( H_{2} O ) |
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| 72 | Hydrogen has high ionization energy than alkali metals because it has: A. ionic bond B. covalent bond c. large size D. small size |
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| 73 | Temporary hardness of water is due to the presence of the nitrates of Ca and Mg. If this is true enter ( 1, ) if false enter 0 |
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| 74 | The correct statements among ( (a) operatorname{to}(d) ) regarding ( mathrm{H}_{2} ) as a fuel are : (a) It produces less pollutant than petrol. (b) A cylinder of compressed dihydrogen weighs ( sim 30 ) times more than a petrol tank producing the same amount of energy. (c) Dihydrogen is stored in tanks of metal alloys like ( N a N i_{5} ) (d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and ( 142 mathrm{kJ} ), respectively ( A ). b and donly B. a, b and conly ( c . ) b, cand donly D. a and c only |
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| 75 | The exhausted permutit used for removing permanent hardness is regenerated by treating ( 10 % ) NaCl solution.
If this is true enter 1 , if false enter 0 . |
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| 76 | Calcium and Magnesium salts like cause hardness of water This question has multiple correct options A. bicarbonates B. chlorides C . sulphates D. phosphates |
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| 77 | Temporary hardness can be removed by mixing water with slaked lime, this process is known as | 11 |
| 78 | In crystalline ( boldsymbol{H}_{2} boldsymbol{O}_{2}, ) the dihedral angle is increased to 100 A. True B. False |
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| 79 | How many neutrons are present in tritium nucleus? A. 0 B. ( c cdot 2 ) ( D ) |
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| 80 | ( D_{2} O ) differ in the following except: A. freezing point B. density c. ionic product of water D. its reaction with sodium |
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| 81 | ( 3.4 mathrm{g} ) of ( H_{2} O_{2} ) decomposes, the weight of oxygen liberated from it is: A ( .1 .6 g ) B . 2.24 g c. ( 1.16 mathrm{g} ) D. ( 3.2 mathrm{g} ) |
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| 82 | Which of the following reactions will not produce any hydrogen gas? A. Reaction between ( F e ) and dil. ( H C l ) B. Reaction between ( Z n ) and conc. ( H_{2} S O_{4} ) C. Reaction between ( Z n ) and ( N a O H ) D. Electrolysis of ( N a C l ) in Nelson’s cell. |
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| 83 | 7. Hydrogen is obtained as a by-product in the (a) electrolysis of water (b) manufacture of caustic soda (c) Bosch process (d) Lane process |
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| 84 | What characteristics do you except from an electron-deficient hydride with respect to its structure and chemical reactions? |
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| 85 | Which of the following act as a stabilizer for the storage of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) ? A . Alkal B. Dust c. urea D. None of these |
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| 86 | Calgon is an industrial name given to A. normal sodium phosphate B. sodium meta-aluminate c. sodium hexametaphosphate D. hydrated sodium aluminium silicate |
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| 87 | Explain fuel-cell in detail. | 11 |
| 88 | How does ( H_{2} O_{2} ) reacts with ( K_{2} C r_{2} O_{7} ) in acidic medium in ether cold conditions? |
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| 89 | Assertion Heavy water is used as amoderator in nuclear reactors. Reason Heavy water is made of an isotope of helium. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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| 90 | AUS. Herstal ligulues are TUNDU Q16. What is the cause of bleaching action of H2O2? T + |
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| 91 | Q. 36 Molecular hydrides are classified as electron deficient, electron precise and electron rich compounds. Explain each type with two examples. |
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| 92 | Neutronless neutral atom is ( A cdot H ) в. не c. Na D. |
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| 93 | 5 Radioactive elements emit a, B and y rays and are characterised by their half-lives. The radioactive isotope of hydrogen is (a) protium (b) deuterium (c) tritium (d) hydronium |
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| 94 | Electrolysis of ( 50 % H_{2} S O_{4} ) produces: A. ( H_{2} S_{2} O_{8} ) at anode B. ( H_{2} ) at anode ( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{5} ) at cathode D. ( H_{2} O_{2} ) at anode |
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| 95 | ( boldsymbol{P b S}+boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{H}_{2} boldsymbol{O}+ldots ldots ) A ( . P b S O_{3} ) в. ( P b S O_{4} ) c. ( P bleft(S O_{4}right)_{2} ) D. ( P bleft(S O_{4}right)_{3} ) |
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| 96 | Assertion: The ( O-O ) bond length in ( H_{2} O_{2} ) is shorter than that of ( O_{2} F_{2} ) Reason: ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is an ionic compound A. If both assertion and reason are true and the reason is a correct explanation of the assertion B. If both assertion and reason are true but reason is not a correct explanation of the assertion c. If the assertion is true but reason is false D. If both the assertion and reason are false E. If the assertion is false but the reason is true |
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| 97 | 2. Hydrogen peroxide is used as (a) an oxidizing agent (c) a bleaching agent (b) a reducing agent (d) all of the above |
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| 98 | Temporary hardness of water is removed in Clark’s process by adding: A. caustic soda B. calgon c. borax D. lime |
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| 99 | Which of the following is the resulting product at anode when electrolysis of a dilute solution of sodium chloride occurs? A. Sodium B. Hydrogen c. Chlorine D. oxygen E . Peroxide |
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| 100 | In all its properties, hydrogen resembles: A. alkali metals only B. halogens only c. both alkali metals and halogens D. neither alkali metals nor halogens |
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| 101 | Elements of which of the following groups do not form hydrides? A. 1,2,3 в. 3,4,5 c. 7,8,9 D. 6,7,8 |
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| 102 | State whether the given statement is true or false: Hydrogen peroxide acts both as an oxidizing and as a reducing agent in alkaline solution towards certain first- row transition metal ions. |
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| 103 | Henry Cavendish discovered hydrogen. A. True B. False |
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| 104 | On electrolysis of NaH, hydrogen is liberated at: A. anode B. cathode c. inert electrode D. none of these |
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| 105 | The name for hydrogen comes from the words which means: A. water fearer B. water former c. gas D. fire former |
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| 106 | The volume strength of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) solution is ( 10 . ) It means: A ( cdot ) at ( operatorname{s.} ). ( . P . ) 10 ( g ) solution of ( H_{2} O_{2} ) gives 10 mL of ( O_{2} ) B. at S.T.P. 1 g equivalent of ( H_{2} O_{2} ) gives ( 10 mathrm{mL} ) of ( O_{2} ) c. at st.P. 10 litre solution of ( H_{2} O_{2} ) gives ( 10 mathrm{mL} ) of ( O_{2} ) D. at S.T.P. 1 mL solution of ( H_{2} O_{2} ) gives ( 10 mathrm{mL} ) of ( O_{2} ) |
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| 107 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) reduces ( boldsymbol{K}_{3}left[boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{6}right] ) in: A. neutral medium B. acidic medium. c. alkaline medium. D. non-polar solution |
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| 108 | . 40 (1) Draw the gas phase and solid phase structure of H202. (ii) H20, is a better oxidising agent than water. Explain. houlor dimensions in the gas phase |
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| 109 | This is known as heavy hydrogen: A. protium B. tritium c. deuterium D. proton |
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| 110 | The nucleus of deuterium, called a deuteron, contains: A. one proton and no neutron B. one proton and one electron c. one proton and one neutron D. one proton and two neutron |
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| 111 | A metal ………. hydrogen in the activity series gives hydrogen with ( ldots ldots . . . ) acid or acid. This question has multiple correct options A . above B. below c. dilute hydrochloric acid D. concentrated hydrochloric E. dilute sulphuric ( F ). none of the above |
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| 112 | Which of the following exists as associated molecules due to hydrogen bonding? This question has multiple correct options A ( cdot N H_{3} ) в. ( H_{2} O ) c. ( H F ) D. ( H C l ) |
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| 113 | Hard water is passed through an ionic exchange resin containing ( -boldsymbol{S O}_{3} boldsymbol{H} ) group. The outcoming water is free of the following ions A ( cdot C l ) в. ( N O_{3} ) c. ( H_{3} O^{+} ) D. ( C a^{+2} ) |
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| 114 | Which gas is liberated when an acid reacts with metal? |
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| 115 | A reaction of hydrogen with which of the following is an example of both reduction and oxidation reactions? A . ( S ) в. ( N_{2} ) ( c cdot O_{2} ) D. ( F_{2} ) |
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| 116 | Why does ( H^{+} ) always get associated with other atoms or molecules? A. lonisation enthalpy of hydrogen resembles that of alkali metals. B. Its reactivity is similar to halogens. c. It resembles both alkali metals and halogens. D. Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist freely |
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| 117 | Permanent hardness of water is due the presence of A. calcium carbonate B. calcium chloride c. calcium bicarbonate D. calcium sulphide |
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| 118 | Heavy water ( left(D_{2} Oright) ) freezes at: ( mathbf{A} cdot 0^{circ} C ) в. ( -3.8^{circ} mathrm{C} ) ( mathbf{c} cdot 0.8^{circ} mathrm{C} ) D. ( 3.82^{circ} mathrm{C} ) |
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| 119 | Heavy water violence is formed on combining deuterium with: A. oxygen B. lithium c. hydrogen D. helium |
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| 120 | Hydrogen burns with: A. smoky flame B. yellow flame c. blue flame D. pale yellow flame |
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| 121 | The melting point of most of the solid substances increases with an increase in pressure. However ice melts at a temperature lower than its usual melting points when pressure is increased. This is because: A. the density of ice is lesser than ( H_{2} O ) B. pressure generates heats c. the chemical bonds break under pressure D. ice is not a true solid |
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| 122 | Separation of ( H_{2} O ) and ( D_{2} O ) by fractional distillation is possible because ( D_{2} O ) has: A . higher density than that of ( H_{2} O ) B. higher boiling point than that of ( H_{2} O ) C. higher freezing point than that of ( H_{2} O ) D. lower dielectric constant than that of ( H_{2} O ) |
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| 123 | ( boldsymbol{H}^{+}, boldsymbol{D}^{+}, boldsymbol{a} boldsymbol{n} boldsymbol{d} boldsymbol{T}^{+} ) differ in: A. number of electrons B. number of neutrons c. number of proton D. all are correct |
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| 124 | The ion exchange resin which remove metal ions from hard water consist of giant organic molecule containing: A. – Cl group в. ( – ) COOH group c. ( -O H ) group D. ( -N H_{2} ) group |
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| 125 | is present in traces in air. A. Nitrogen B. Oxygen c. Hydrogen D. None of these |
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| 126 | Temporary hardness of water can be removed by adding: A . ( N a O H ) в. ( N a_{2} C O_{3} ) ( mathbf{c} cdot C a(O H)_{2} ) D. ( M g C l_{2} ) |
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| 127 | Beneath the surface of the ocean, there is no air available for burning fuel. Which of the following chemicals is used with oil as an underwater fuel? A. Sulphuric acid B. Hydrogen peroxide c. Hydrogen D. Magnesium |
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| 128 | What is the trend of boiling points of hydrides of ( mathrm{N}, mathrm{O}, ) and ( mathrm{F} ) ? A. Due to lower molecular masses ( N H_{3}, H_{2} O ) and HF have lower boiling points than those of the subsequent group member hydrides B. Due to higher electronegativity of ( mathrm{N}, mathrm{O} ) and ( mathrm{F} ) ( N H_{3}, H_{2} O ) and HF show hydrogen bonding and hence higher boiling points than the hydrides of their subsequent group members. C. There is no regular trend in the boiling points of hydrides D. Due to higher oxidation states of ( mathrm{N}, mathrm{O} ) and ( mathrm{F} ), the boiling points of ( N H_{3}, H_{2} O ) and HF are higher than the hydrides of their subsequent group members. |
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| 129 | Which gas sample contains the fewest molecules? A ( cdot 1.00 d m^{3} ) of carbon dioxide at ( 27^{circ} C ) and ( 2.0 k P a ) B. ( 1.00 d m^{3} ) of hydrogen at ( 100^{circ} mathrm{C} ) and ( 2.0 mathrm{kPa} ) C ( cdot 1.00 d m^{3} ) of nitrogen at ( 300^{circ} mathrm{C} ) and ( 4.0 k P a ) D. ( 1.00 d m^{3} ) of oxygen at ( 250^{circ} mathrm{C} ) and ( 3.0 mathrm{kPa} ) |
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| 130 | Which of the following is not a deuterolysis reaction A. ( S O_{3}+D_{2} O rightarrow D_{2} S O_{4} ) в. ( C a C_{2}+2 D_{2} O rightarrow C a(O D)_{2}+C_{2} D_{2} ) c. ( M g_{3} N_{2}+6 D_{2} O rightarrow 3 M g(O D)_{2}+2 N D_{3} ) D. ( A l C l_{3} 3 D_{2} O rightarrow A l(O D)_{3}+3 D C l ) |
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| 131 | Specific heat of water is: A. very low B. medium c. sometimes high and sometimes low D. none of the above |
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| 132 | Q. 27 Which of the following statements is correct? (a) Metallic hydrides are deficient of hydrogen (b) Metallic hydrides conduct heat and electricity (c) lonic hydrides do not conduct electricity in solid state (d) lonic hydrides are very good conductors of electricity in som state |
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| 133 | Consider the following statements. I. Atomic hydrogen is obtained by passing hydrogen through an electric arc. Il. Hydrogen gas will not reduce heated aluminium oxide. III. Finely divided palladium absorbs large volume of hydrogen gas. Which of the above statement(s) is(are) correct: A. I alone B. ॥ alone c. I, Il and III D. II, III E. None of these |
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| 134 | Which of the following is a chemical property of hydrogen? A. It is monoatomic. B. It is less dense than air. c. It is odorless. D. It is colorless E. It combusts in the presence of oxygen |
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| 135 | The melting point of ice on Kelvin scale is: ( A cdot O K ) в. – -273 к с. 273 к D. 373 к |
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| 136 | Which of the following represents calgon? A ( . N a_{2} A l_{2} S i_{2} O_{8} ) в. ( M g_{3}left(P O_{4}right)_{2} ) c. ( N a_{2}left[N a_{4}left(P O_{3}right)_{6}right] ) D. ( N a_{2}left[M g_{2}left(P O_{3}right)_{6}right] ) |
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| 137 | Silver reacts with hydro chloric acid to give A. ( A g C l ) в. ( H_{2} ) c. ( A g H ) D. no reaction |
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| 138 | 26. Water gas is the combination (1) CO and H. (2) CO, and H, (3) CO and H,O (4) CO, and CO |
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| 139 | As oxygen is ( _{–}-_{-}- ) soluble in water air dissolved in water contains a higher percentage of oxygen ( (30-35 %) ) than ordinary air ( (21 %) ) |
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| 140 | toppr Q Type solutıon (C). Lıthıum Is reacted with (B) yielding a solid product (D) which effervescence with water to give a strongly basic solution (E). When ( C O_{2} ) gas is bubbled through the solution (C), a white ppt (F) is formed but this redissolved forming solution (G) when more ( C O_{2} ) is passed. The precipitate (F) effervesced when moistened with conc. ( H C l ) and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at ( 2000^{circ} C ) give (H). Solution (G) contains a salt which: |
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| 141 | The present position of hydrogen in the modern periodic table completely justifiable. A. True B. False |
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| 142 | ( H_{2} O_{2} ) decomposes below its boiling point if it is distilled at ordinary pressure. A. True B. False |
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| 143 | Identify the odd term out and explain. Hydrogen, hydrogen peroxide, carbon dioxide, water vapour | 11 |
| 144 | The ratio of number of electrons, protons and neutrons in tritium is: A. 1: 1: 1 B. 1: 1: 2 c. 2: 1: 1 D. 1: 2: 1 |
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| 145 | For decolourisation of 1 mole of ( K M n O_{4}, ) the moles of ( H_{2} O_{2} ) required is: A ( cdot 1 / 2 ) B. 3/2 ( c cdot 5 / 2 ) D. ( 7 / 2 ) |
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| 146 | Heavy hydrogen is used: A. in filling balloons B. in studying reaction mechanism C. in calculating heat of formation D. as oxidizing agent |
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| 147 | Deuterium is more reactive than Hydrogen. If this is true enter 1 , if false enter 0 . |
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| 148 | Fill in the blanks: Hydrogen reacts with metal oxides to form ………….. and |
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| 149 | Atomic nuclear reactors use heavy water. This is different from ordinary water only to the extent that in place of hydrogen it contains: A. deuterium, a heavier isotope of hydrogen B. nitrogen, which is also a light element c. tritium, an heavier isotope of hydrogen D. a radioactive element |
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| 150 | Assertion Melting and boiling points of ( D_{2} O ) are higher than those of ordinary ( boldsymbol{H}_{2} boldsymbol{O} ) Reason ( D_{2} O ) has lesser degree of association and lower molecular mass than ( boldsymbol{H}_{2} boldsymbol{O} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 151 | The metal that can not displace hydrogen from dil. ( boldsymbol{H} boldsymbol{C l} ) is: ( A . A l ) в. ( F e ) c. ( C u ) D. ( Z n ) |
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| 152 | element has one electron in the outermost shell and attains duplet configuration after accepting one more electron and attains stability. A. Helium B. Hydrogen c. Lithium D. carbon |
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| 153 | In which of the following reactions, ( H_{2} O_{2} ) acts as a reducing reagent? A ( cdot P b O_{2(s)}+H_{2} O_{2(a q)} rightarrow P b O_{(s)}+H_{2} O_{(l)}+O_{2(g)} ) B . ( N a_{2} S O_{3(a q)}+H_{2} O_{2(a q)} rightarrow N a_{2} S O_{4(a q)}+H_{2} O_{(l)} ) ( mathbf{c} cdot 2 K I_{(a q)}+H_{2} O_{2(a q)} rightarrow 2 K O H_{(a q)}+I_{2(s)} ) D. None of these |
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| 154 | Which of the following is not true? A. Ordinary water is electrolysed more rapidly than ( D_{2} O ) B. ( D_{2} O ) freezes at lower temperature than ( H_{2} O ) C. Reaction between ( H_{2} ) and ( C l_{2} ) is much faster than ( D_{2} ) and ( C l_{2} ) D. Bond dissociation energy for ( D_{2} ) is greater than ( H_{2} ) |
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| 155 | Q2. What are interstitial hydrides? Give two examples. | 11 |
| 156 | Water softening by Clark’s process uses: ( mathbf{A} cdot C a H C O_{3} ) в. ( operatorname{NaH} mathrm{CO}_{3} ) ( mathbf{c} cdot N a_{a} C O_{3} ) ( mathbf{D} cdot operatorname{Ca}(O H)_{2} ) |
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| 157 | Which of the hydrated species can exist? I. ( boldsymbol{H}_{mathbf{5}} boldsymbol{O}_{mathbf{2}}^{+} ) II. ( boldsymbol{H}_{3} boldsymbol{O}^{+} ) III. ( boldsymbol{H}_{3} boldsymbol{O}_{2}^{-} ) IV. ( boldsymbol{H}_{7} boldsymbol{O}_{3}^{+} ) Select alternate from. A. Il only B. I and II c. I, II and IV D. I, II, II and IV |
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| 158 | Water exists both as solid and liquid at: A ( cdot 100^{circ} mathrm{C} ) В. ( 50^{circ} ) С c. ( 2.5^{circ} mathrm{C} ) D. ( 0^{circ} mathrm{C} ) E ( .-10^{circ} mathrm{C} ) |
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| 159 | Which of the following statement regarding ( D_{2} O ) is correct? This question has multiple correct options |
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| 160 | In laboratory, ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is prepared by the action of: A ( cdot ) cold ( H_{2} S O_{4} ) and ( B a O_{2} ) B. aqueous alkali on ( N a_{2} O_{2} ) c. ( M n O_{2} ) and cold ( H_{2} S O_{4} ) D. dilute ( H C l ) and ( M n O_{2} ) |
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| 161 | The gas used in the hydrogenation of oils in presence of nickel as a catalyst to give vanaspathi is ( A cdot O_{2} ) в. ( N_{2} ) ( mathrm{c} cdot mathrm{H}_{2} ) D. ( C l_{2} ) |
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| 162 | Hydrogen exhibits: A. electropositive character B. elctronegative character C. Both A and B D. None of the above |
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| 163 | Assertion In atomic form hydrogen consists one proton and one electron. Reason In elemental form hydrogen exists as a diatomic molecule and is called dihydrogen. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 164 | In water-gas shift reaction, hydrogen gas is produced from the reaction of steam with: A. methane B. coke c. carbon monoxide D. carbon dioxide |
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| 165 | Which of the following properties of hydrogen is incorrect? A. Like halogens, hydrogen exists as a diatomic gas B. Like halogens, hydrogen exhibits – 1 oxidation state in its compounds with metals C. Like halogens, hydrogen is liberated at cathode D. The ionization energy of hydrogen is quite close to halogens |
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| 166 | Which of the following easily catalyse the decomposition of ( H_{2} O_{2} ) when stored? (i) Rough surface (ii) sunlight (iii) Dust particles (iv) Metals A. (ii)and (ii) B. (i),(ii) and (iii) c. (ii) and (iii) D. All of these |
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| 167 | Liquid hydrogen is used as a fuel for rocket propulsion. A. True B. False |
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| 168 | Some reasons are given regarding the limited use of ( boldsymbol{H}_{2} ) as fuel: I) Its calorific value is low. Il) Its availability in free state is less. III) It is difficult to store. IV) It is easy to transport. The correct statements are: ( A cdot ) ।, ॥ । and ( | 1 ) B. II, III and IV c. ॥ and III D. I and III |
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| 169 | Complex which is formed during the estimation of hardness of water is: ( mathbf{A} cdotleft[C aleft(S O_{4}right)_{2}right]^{2} ) B ( cdotleft[C aleft(H C O_{3}right)_{6}right]^{4-} ) ( mathbf{c} cdot[C a(E D T A)]^{2} ) D. ( N a_{2}left[C a_{2}left(P O_{3}right)_{6}right. ) |
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| 170 | Water is a good fire extinguisher. But it is not used extinguish electrical fires and oil for? |
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| 171 | The most abundant isotope of hydrogen is: A. tritium B. deuterium c. protium D. para hydrogen |
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| 172 | Which of the following will be decomposed into hydrogen by metals like ( boldsymbol{F e}, boldsymbol{S n}, boldsymbol{N} boldsymbol{i} ? ) A. Cold water B. Boiling water c. Steam D. All of these |
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| 173 | A deuterium is: A. an electron with a positive charge B. a nucleus havng two protons C . a nucleus containing a neutron and two protons D. a nucleus containing a neutron and a proton |
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| 174 | If ( 10 mathrm{ml} ) of ( mathrm{H}_{2} mathrm{O}_{2} ) solution requires ( 25 mathrm{m} ) of ( frac{mathbf{N}}{mathbf{2 0}} mathbf{K M n O}_{4} ) for complete oxidation in acidic medium, then the mass (in g) of available ( O_{2} ) per litre present in the solution is: A . 1 B. 2 ( c .3 ) D. 4 |
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| 175 | Decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is prevented by adding: A. ( N a O H ) в. ( M n O_{2} ) c. acetanilide D. carbon powder |
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| 176 | Which of the following substance is not present in clear water? A ( cdot operatorname{Ca}left(mathrm{HCO}_{3}right)_{2} ) в. ( M g C l_{2} ) ( mathrm{c} cdot mathrm{CaSO}_{4} ) D. ( C a C O_{3} ) |
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| 177 | IUI 0.19 Which of the following statements are not true for you (a) It exists as diatomic molecule (b) It has one electron in the outermost shell (c) It can lose an electron to form a cation which can freely exist (d) It forms a large number of ionic compounds by losing an electron |
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| 178 | ( H_{2} S ) reacts with lead acetate to form a black compound which reacts with ( H_{2} O_{2} ) to form another compound. The colour of this another compound is: ( A cdot ) pink B. black c. yellow D. white |
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| 179 | Regarding the uses of hydrogen I) It is used in the synthesis of ammonia. Il) It is used as reducing agent in the extraction of tungsten. III) It is the source of solar energy. IV) It is the major fuel in nuclear reactors. The correct statements are: ( mathbf{A} cdot ) ।, ॥ and ( | 1 ) B. II and III c. ॥, ॥ा and IV D. All are correct |
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| 180 | ( H_{2} ) is present in the free state in sun and stars. A. True B. False |
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| 181 | What is heavy water? ( mathbf{A} cdot H_{2} O^{18} ) B. ( D_{2} ), ( mathrm{c} cdot mathrm{H}_{2} mathrm{O}^{1} ) D. $$H_{2] |
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| 182 | Assertion Hydrogen is a diatomic molecule. Reason Hydrogen atom has a single electron in its outermost shell. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 183 | Among ( N H_{3}, H_{2} O ) and ( H F, ) which would you expect to have highest magnitude of hydrogen bonding and why? |
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| 184 | Which of the following is an example of condensation? This question has multiple correct options A. Dew forms in the morning B. The mirror in the bathroom during a shower getting foggy C. Water droplets formation on cold water bottle D. Cooling of water in refrigerator |
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| 185 | ( H_{2} O_{2} ) can be obtained when following reacts with ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) except with A ( cdot P b O_{2} ) в. ( B a O_{2} ) c. ( N a_{2} O_{2} ) D. ( operatorname{sr} O_{2} ) |
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| 186 | Hydrogen peroxide is obtained by the electrolysis of A. water B. sulpharic acid c. hydrochoric acid D. fused sodium |
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| 187 | Henry cavendish discovered A. nitrogen B. hydrogen c. oxygen D. none of these |
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| 188 | A hydride is a compound containing hydride ion, ( boldsymbol{H}^{-} ). Predict two elements whose hydrides would contain incomplete octets |
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| 189 | The various types of hydrides and examples of each type are given below. Hydride types Compounds ( (A) ) Electron deficient ( (i) L i H ) ( (B) ) Saline ( (i i) C H_{4} ) ( (C) ) Electron precise ( (i i i) N H_{3} ) ( (D) ) Interstitial ( (i v) B_{2} H_{6} ) ( (boldsymbol{E}) ) Electron rich ( (boldsymbol{v}) boldsymbol{C r} boldsymbol{H} ) Choose the correct matching from the codes given below. A ( cdot(A)-(i i),(B)-(i v),(C)-(v),(D)-(i i i),(E)-(i) ) B. ( (A)-(i v),(B)-(i),(C)-(i i),(D)-(v),(E)-(i i i) ) C. ( (A)-(i v),(B)-(i i i),(C)-(v),(D)-(i i),(E)-(i) ) D. ( (A)-(v),(B)-(i i i),(C)-(i v),(D)-(i i),(E)-(i) ) E ( .(A)-(i v),(B)-(v),(C)-(i),(D)-(i i),(E)-(i i i) ) |
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| 190 | Basic principle of hydrogen economy is: A. transportation of energy in the form of liquid or gaseous dihydrogen B. storage of energy in the form of liquid or gaseous dihydrogen ( c cdot operatorname{both} A ) and ( B ) D. none of the above |
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| 191 | Hydrogen bomb has been prepared by the fusion of: This question has multiple correct options A. Hydrogen B. Deutrium (heavy hydrogen) c. Tritium D. Alpha particles |
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| 192 | Q. 22 Which of the following statements about hydrogen are correct? (a) Hydrogen has three isotopes of which protium is the most common (b) Hydrogen never acts as cation in ionic salts (c) Hydrogen ion, H, exists freely in solution (d) Dihydrogen does not act as a reducing agent |
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| 193 | The properties or physical constants which are lower for hydrogen than that of deuterium are: This question has multiple correct options A. Abundance B. Boiling point c. Latent heat of fusion D. Activation energy |
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| 194 | About ( 88.6 % ) of the universe is made up of : A. Helium B. Oxygen c. Nitrogen D. Hydrogen |
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| 195 | is known as heavy hydrogen. A. Protium B. Deuterium c. Tritium D. Proton |
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| 196 | Distilled water though pure, is not preferred to drink due to its flat insipid taste. A. True B. False |
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| 197 | ( H_{2} O_{2} ) is considered as dibasic acid, as it can form: A. peroxide and super oxides B. hydroperoxides and peroxides c. peroxides and dioxides D. dioxides only |
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| 198 | A student was given ( mathrm{Mg}, mathrm{Zn}, mathrm{Fe} ) and ( mathrm{Cu} ) metals. He puts each of them in dil.HC contained in different test tubes.
Identify which of them will not displace |
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| 199 | Which of the following statements regarding hydrides iis not correct? A. Ionic hydrides are crystalline, non-volatile and nonconducting in solid state B. Electron-deficient hydrides act as Lewis acids or electron acceptors C. Elements of group-13 form electron-deficient hydride D. Elements of group ( 15-17 ) form electron-precise hydrides |
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| 200 | ( D_{2} O ) is used as a moderator in nuclear reactors to slow down the neutrons. If this is true enter 1 , if false enter 0 . |
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| 201 | Among ( boldsymbol{C a} boldsymbol{H}_{2}, boldsymbol{N} boldsymbol{H}_{3}, boldsymbol{N a H} ) and ( boldsymbol{B}_{2} boldsymbol{H}_{6} ) which are covalent hydrides? ( mathbf{A} cdot N H_{3} ) and ( B_{2} H_{6} ) в. ( N a H ) and ( C a H_{2} ) c. ( N a H ) and ( N H_{3} ) D. ( C a H_{2} ) and ( B_{2} H_{6} ) |
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| 202 | Polyphosphates like sodium hexametaphosphate (calgon) are used as water softening agents because they: A. form soluble complexes with anionic species B. precipitate anionic species c. form soluble complexes with cationic species D. precipitate catatonic species |
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| 203 | . 70 How can D,O be prepared from water? Mention the physical properties in which D20 differs from H.O. Give at least three reactions of D0 showing the exchange of hydrogen with deuterium. |
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| 204 | Heavy hydrogen is used: A. in filling balloons B. in studying reaction mechanism C. in calculating heat of formation D. as oxidizing agent |
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| 205 | 255 Q18. Name the phenomenon of adsorption of hydrogen on metal surface. |
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| 206 | In the reaction, ( A g_{2} O+H_{2} O_{2} rightarrow ) ( 2 A g+H_{2} O+O_{2}, ) the ( H_{2} O_{2} ) acts as: A. oxidising agent B. bleaching agent c. acid D. reducing agent |
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| 207 | Hydrogen is mainly found in the combined state like in water and not the free state. A. True B. False |
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| 208 | Hard water is unfit for laundries because: This question has multiple correct options |
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| 209 | A sample of hard water contains 111 ppm of ( C a C l_{2} . ) The degree of hardness of this sample of water is: A. 11 в. 150 c. 100 D. 180 |
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| 210 | Among I-A elements, which element is gas at room temperature? A. Hydrogen B. Lithium c. Sodium D. Potassium |
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| 211 | 9. Hydrides as well as halides of alkaline earth metals tend to polymerize (b) Ca (c) Be (d) Mg (a) Sr |
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| 212 | SLV-3 rockets use A. solid propellants B. liquid propellants C. hybrid propellants D. composite solid propellants ( E ). none of the above |
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| 213 | Write chemical reactions to justify that hydrogen peroxide can function as an oxidising as well as reducing agent | 11 |
| 214 | Which element has neither definite shape nor volume? A. Sodium B. Hydrogen c. lodine D. Lithium |
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| 215 | This is known as heavy hydrogen: A. protium B. tritium c. deuterium D. proton |
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| 216 | The lightest element in the periodic table is A. lithium B. fluorine c. hydrogen D. helium |
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| 217 | 0.51 Write the Lewis structure of hydrogen peroxide. | 11 |
| 218 | In a pressure cooker, the pressure inside increases and hence the boiling point of water decreases thereby food cooks faster. A . True B. False |
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| 219 | The formula of exhausted permutit is A. ( C a A l_{2}, S i_{2} O_{8} . x H_{2} O ) B. ( N a A l_{2}, S i_{2} O_{8} . x H_{2} O ) ( mathrm{c} cdot mathrm{CaB}_{2} mathrm{Si}_{2} mathrm{O}_{8} cdot x mathrm{H}_{2} mathrm{O} ) D. ( K_{2} A l_{2}, S i_{2} O_{8} . . x H_{2} O ) |
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| 220 | Hydrogen acts as an oxidising agent in the reaction with: ( mathbf{A} cdot B r_{2} ) в. ( C a ) c. ( N_{2} ) D. ( S ) |
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| 221 | The metal not present in hard water is: A. ( C a ) в. ( N a ) c. ( M g ) D. ( F e ) |
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| 222 | Which of the following is not a property of hydrogen? A. It is a colourless, odorless gas B. It is highly combustible c. It is highly poisonous gas D. It is lighter than air |
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| 223 | Dihydrogen has: A. two isotopes and no isomers B. three isotopes and two nuclear isomers C. three isotopes and two optical isomers D. two isotopes and two geometrical isomers |
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| 224 | Mark the following statements as true or false (i) Ordinary hydrogen is a mixture of 75 ( % ) ortho and ( 25 % ) para-forms (ii) All the four atoms of moleculle of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) lie in the same plane. (iii) Hydrogen peroxide is neutral like water. (iv) ( H_{2} O_{2} ) can be prepared from ( B a O_{2} ) but not from ( M n O_{2} ) and ( P b O_{2} ) A. ( (i) ) and ( (i v)- ) true ( (i i) ) and ( (i i i)- ) false B. ( (i) ) and ( (i i)- ) true ( (i v) ) and ( (i i i)- ) false C. ( (i i i) ) and ( (i v)- ) true ( (i i) ) and ( (i i)- ) false D. ( (i) ) and ( (i i i)- ) true ( (i i) ) and ( (i v)- ) false |
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| 225 | Which of the following metal reacts with steam to liberate hydrogen? A. Magnesium B. Aluminium c. zinc D. All of the above |
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| 226 | Aluminium reacts with ( boldsymbol{H} boldsymbol{C l} ) to form ( boldsymbol{H}_{2} ) gas, but do not react with ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3}, ) why? A. ( A l ) with ( H N O_{3} ) forms ( A l_{2} O_{3} ) which is passive for further reaction B. ( A l ) with ( H N O_{3} ) forms ( A l_{2} O_{7} ) which is passive for further reaction c. ( A l ) with ( H N O_{3} ) forms ( A l_{2} O_{4} ) which is passive for further reaction D. ( A l ) with ( H N O_{3} ) forms ( A l_{3} O_{2} ) which is passive for further reaction |
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| 227 | Which of the following metals does not produce hydrogen gas when added to acid? A. Potassium B. Gold c. zinc D. Leadd |
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| 228 | Hydrogen loses its electron to form ( boldsymbol{H}^{+} ) in this respect, it resembles: A. halogens B. alkali metalss c. transition element D. alkaline earth metals |
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| 229 | How do you expect the metallic hydrides to be useful for hydrogen storage? Explain. | 11 |
| 230 | When a substance reacts with water and breaks into acids and bases the process is called: A. dialysiss B. solvolysis c. hydrolysis D. dissolution |
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| 231 | A metal which does not react with cold water but reacts with steam to liberate ( H_{2} ) gas is : A. ( N a ) в. ( M g ) c. ( A u ) D. ( F e ) |
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| 232 | Using ( N a_{2} C O_{3}, ) both temporary and permanent hardness can be removed. If this is true enter 1 , if false enter 0 . | 11 |
| 233 | Perhydrol is: ( mathbf{A} cdot 10 % H_{2} O_{2} ) B. ( 30 % mathrm{H}_{2} mathrm{O}_{2} ) ( mathbf{c} cdot 3 % H_{2} O_{2} ) D. ( 100 % mathrm{H}_{2} mathrm{O}_{2} ) |
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| 234 | How did the name ‘hydrogen’ originate? | 11 |
| 235 | Q. 38 Write one chemical reaction for the preparation of D202. | 11 |
| 236 | What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15,19,23 and 44 with dihydrogen? Compare their behaviour towards water | 11 |
| 237 | Which scientist established the elementary character of hydrogen? A. Robert Boyle B. Henry Cavendish c. Lavoiser D. scheele |
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| 238 | ( D_{2} O ) is: A ( . ) product of ( O_{2} ) and ( H_{2} ) B. simple water in which present heavy metal salts C. marine water D. water which form redistillation and condensation |
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| 239 | Neutron is not present in the nucleus of: A . helium B. protium c. tritium D. lithium |
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| 240 | 1 kg of a sample of water contains 222 ( mathrm{mg} ) of ( mathrm{CaCl}_{2} ) and ( 219 mathrm{mg} ) of ( M gleft(H C O_{3}right)_{2} . ) Its permanent hardness and temporary hardness in ppm are respectively: A .200,200 B . 200,150 c. 200,300 D. 150,220 |
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| 241 | Assertion ( H_{2} O_{2} ) under goes dispropontionation on heating. Reason It gives ( H_{2} O ) and ( O_{2} ) on heating. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 242 | Among I-A elements which is the only non-metal? A. Hydrogen B. Lithium c. Sodium D. Potassium |
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| 243 | Ortho-hydrogen and para-hydrogen resembles in which of the following property? A. Thermal conductivity B. Magnetic properties c. chemical properties D. Heat capacity |
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| 244 | Statement-1: Both sodium and hydrogen have outer electronic configuration ( boldsymbol{n} boldsymbol{s}^{1} ) but hydrogen is less reactive than sodium Statement-2: Hydrogen has greater ionisation energy. |
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| 245 | Which of the following is not a disadvantage of using hard water? A. In production of steam in boilers B. Formation of scales in cooking utensils c. In cooking,bathing and washing D. In ion exchanges |
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| 246 | Which of the following reactions shows reducing nature of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ? ) A. ( P b S+4 H_{2} O_{2} rightarrow P b S O_{4}+4 H_{2} O ) B. ( A g_{2} O+H_{2} O_{2} rightarrow 2 A g+H_{2} O+O_{2} ) c. ( 2 H C H O+H_{2} O_{2} rightarrow 2 H C O O H+H_{2} O ) D. ( N a_{2} S O_{3}+H_{2} O_{2} rightarrow N a_{2} S O_{4}+H_{2} O ) |
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| 247 | Q. 16 Which of the following compounds is used for water softening? (a) Ca3(PO4)2 (b) Na3PO4 (c) Na P.018 (d) Na2HPO4 |
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| 248 | Which one of the following property is high in the case of water? A. Surface tension B. Specific heat c. Heat of vaporization and heat of fusion D. All of the above |
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| 249 | Q. 13 Hydrogen peroxide is obtained by the electrolysis of (a) water (b) sulphuric acid (c) hydrochloric acid (d) fused sodium peroxide ition |
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| 250 | In the neighbourhood of your school hard water required for an experiment is not available. Select from the following grous of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard : A. sodium chloride, calcium chloride B. potassium chloride, sodium chloride c. sodium chloride, magnesium chloride D. calcium chloride, magnesium chloride |
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| 251 | ( H_{2} O_{2} ) forms prismatic crystals at: ( mathbf{A} cdot 0^{circ} C ) B . ( 2^{circ} mathrm{C} ) ( c .2 K ) D. ( -1.7^{circ} mathrm{C} ) |
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| 252 | Water released from dams is measured in? A. Feet per second or CFS B. Liters c. cusesc D. Feet |
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| 253 | 3. Water may be softened using (a) sodium aluminium silicate (c) an ion exchange resin (e) all of the above (b) Graham’s salt (d) trisodium phosphate |
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| 254 | The lightest gas on earth is? A. Hydrogen B. Oxygen c. Helium D. Chlorine |
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| 255 | Explain syngas in detail. | 11 |
| 256 | Tritium is obtained by : A. Nuclear reaction B. Passing steam over heated ( C ) c. Action of ( N a O H ) on ( ^{prime} A l^{prime} ) D. Action of ( H_{2} S O_{4} ) on ( ^{prime} Z n^{prime} ) |
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| 257 | Sea water contains ( -ldots-ldots- ) oxygen which is utilized by animals and plants for respiration. |
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| 258 | Mention the isotopes of hydrogen. | 11 |
| 259 | Hydrogen differs from elements of ( boldsymbol{I}- ) ( A ) group as: A. it can form ionic as well as covalent bond B. all are metals c. ( H^{+} ) is unstable in water D. both ( A ) and ( B ) |
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| 260 | The reactions of heavy water are slow. The reason is : A. heavy water is associated. B. heavy water is dissociated. C. heavy water is of higher mass. D. heavy water is of lower mass. |
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| 261 | 49 Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with the chemical equation if required. DOM |
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| 262 | Hydrogen peroxide does not act as: A . a reducing agent B. an oxidising agent C . a dehydrating agent D. a bleaching agent |
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| 263 | Hydrogen peroxide is now generally prepared to industrial scale by the: A . action of ( H_{2} S O_{4} ) on barium peroxide B. action of ( H_{2} S O_{4} ) on sodium peroxide C . electrolysis of ( 50 % mathrm{H}_{2} mathrm{SO}_{4} ) D. burning hydrogen in excess of oxygen |
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| 264 | Which of the following statements are not true for hydrogen? This question has multiple correct options A. It exists as diatomic molecule B. It has one electron in the outermost shell C. It can lose an electron to form a carbon which can freely exist D. It forms a large number of ionic compounds by losing an electron |
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| 265 | If a mole of hydrogen molecule is heated to a high temoerature then which of the following reactions take place? A ( cdot H_{2}(g)+436 k J m o l^{-1} rightarrow H(g)+H(g) ) B . ( 2 H 2(g)+820 k J m o l^{-1} rightarrow 2 H_{2}(g) ) C ( cdot H_{2}(g)+H_{2}(g)+436 k J m o l^{-1} rightarrow H_{(a q)}^{+}+H_{(a q)}^{-} ) D. ( H_{2}(g)+200 k J m o l^{-1} rightarrow H_{(g)}+H_{(g)} ) |
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| 266 | Products formed are: ( mathbf{2} N boldsymbol{a} boldsymbol{B} boldsymbol{H}_{4}+boldsymbol{I}_{2} stackrel{text {Polyether}}{longrightarrow} ) A. ( H I, N a l ) and ( H_{2} ) в. ( B_{2} H_{6}, ) Nal and ( H I ) c. ( B_{2} H_{6}, ) Nal and ( H_{2} ) D. ( H_{3} B O_{3}+H_{2} ) |
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| 267 | Heavy water is used as: A. drinking water B. detergent C. washing water D. a moderator |
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| 268 | Calgon is an artificial zeolite for removing permanent hardness. A. True B. False |
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| 269 | Which of the following statement is correct regarding hydrogen? A. Hydrogen shows +1 and – – – oxidation states B. Hydrogen is never liberated at anode c. Hydrogen has same ionisation enthalpy as that of alkali metals D. Hydrogen has same electronegativity as of halogens |
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| 270 | You provided hard water and soft water is two seperate test tube what do you observe on adding equal quantity of soap soln to each sample of ( H_{2} O ) and shaking them 10 times. |
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| 271 | 5. Calgon, which is used as a water softener, has the formula (a) Na, [Na, (PO3)2) (b) Na, [Na, (PO3). (c) Na, [Na, (PO2)31 (d) Na, [Na, (PO2) |
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| 272 | How will you distinguish :Temporary hard water and permanent hard water? |
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| 273 | Tritium is used as: A. light sources for watches and instruments B. with deuterium, as a fuel for nuclear fusion reactions C . as a radioactive tracer D. all of them |
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| 274 | Pure water has a pleasant taste. A. True B. False |
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| 275 | Non-stoichiometric hydrides are produced by: A. palladium, vanadium B. manganese, lithium c. nitrogen, filorine D. carbon, nockel |
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| 276 | Q. 18 Only one element of ……… forms hydride. (a) group 6 (b) group 7 (c) group 8 (d) group 9 Farmo budride |
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| 277 | The radio active isotope of hydrogen is | 11 |
| 278 | LUULEECE DULCIC254 PM 011 EDOC Q8. What do you understand by (1) Electron-deficient (ii) Electron-precise (iii) Electron-rich compounds of hydrogen? Provide justification with suitable examples. |
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| 279 | Give examples of ionic hydride, molecular hydrides, interstitial hydride, electron precise hydride. |
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| 280 | Which symbol is used for the element hydrogen? A . ( H g ) в. ( H e ) c. ( H ) D. Но E. ( H f ) |
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| 281 | The number of protons, electrons and neutrons respectively in a molecule of heavy water is: A. 10,10,10 в. 8,10,11 c. 10,11,10 D. 11,10,10 |
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| 282 | Hydrogen is not a metal but it has been assigned aplace in the reactivity series of metals.Explain. |
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| 283 | On shaking ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) with acidified potassium dichromate and ether, ethereal layer becomes: A. green B. red c. blue D. brown |
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| 284 | 0.8 Which of the following equations depict the oxidising nature of H202 (a) 2 MnO2 + 6H+ + 5H,022Mn2+ + 8H,0 + 502 (b) 2Fe3+ + 2H+ + H2O 2 Fe2+ + 2H,0 + O2 (c)2 + 2H+ + H202 12 + 2H20 (d) KIO4 + H2O2 -> KIO3 + H2O + O2 |
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| 285 | Burning of hydrogen in air is: A. exothermic reaction B. endothermic reaction c. both exothermic and endothermic D. none of the above |
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| 286 | Hydrogen at the moment of its generation (newly born hydrogen) is generally called: A. protium B. nascent hydrogen c. atomic hydrogen D. heavy hydrogen |
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| 287 | Permutit is the trade name of a mixture of: A. hydrated silicates of ( C a ) and ( M g ) B. hydrated silicates of ( A l ) and ( N a ) C. hydrated aluminates of ( C a ) and ( N a ) D. hydrated aluminates of ( M g ) and ( N a ) |
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| 288 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) exhibits: This question has multiple correct options A. Emulsifying properties B. Hardness Removal properties C . Reducing properties D. Bleaching property |
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| 289 | Heavy water can be used as: A. Neutron moderator B. Production of deuterium C. Tracer compound D. All of above |
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| 290 | Hydrogen differs from elements of ( mathrm{V} |-mathbf{A} ) group as: A. it can gain one electron B. it has one electron in its valence shell C. its electronic configuration is different from other elements D. both ( B ) and ( C ) |
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| 291 | ( 20 mathrm{ml} ) of ( H_{2} O_{2} ) after acidification with ( operatorname{dil} H_{2} S O_{4} . ) required ( 30 mathrm{ml} ) of ( mathrm{N} / 2 ) ( K M n O_{4} ) for complete oxidation Calculate the ( % ) of ( H_{2} O_{2} ) in g/lit. A . 10.75 g/lit B. 11.75 g/lit c. ( 12.75 mathrm{g} / ) lit D. 13.75 g/lit |
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| 292 | When steam in passed over red hot iron, water gas is formed. If this is true enter 1 , if false enter 0 . |
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| 293 | Match the above given table. A. A-3, B-1, C-4, D-5 B. ( A-2, B-3, C-5, D-4 ) c. A-1, B-3, C-4, D-2 D. A-4, B-5, C-3, D-2 |
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| 294 | Metals which liberate hydrogen on treatment with acids must be: A. more electronegative than hydrogen B. less electropositive than hydrogen c. higher compound D. more electropositive than hydrogen |
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| 295 | How many moles of ( H_{2} O_{2} ) are present in 2 litres of ( 6.8 % ) w/v ( H_{2} O_{2} ) solution? |
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| 296 | Give the properties of water responsible for controlling the temperature of our body |
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| 297 | ( H_{2} ) reacts much faster with ( C l_{2} ) then ( D_{2} ) because: A. rate of diffusion of ( H_{2} ) is greater than ( D_{2} ) B. ( H_{2} ) has lower energy of activation than ( D_{2} ) C. both (A) and (B) are correct D. none of the above is correct |
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| 298 | Hydrogen readily combines with these elements? This question has multiple correct options A. Na a B. ( c cdot c a ) D. zn |
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| 299 | Dihydrogen reacts with dioxygen ( O_{2} ) to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer. |
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| 300 | ( ln H_{2} O_{2} ) molecule the 0 – 0 bond length is: A ( .1 .34 AA ) В. 1.48 月 c. ( 1.54 dot{A} ) D. 1.20 à |
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| 301 | If true enter 1 , if false enter 0 . The formula of heavy water is ( boldsymbol{H}_{3} boldsymbol{O}^{+} ) A . |
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| 302 | ( H_{2} ) is more reactive than ( D_{2} ) because: A. ( H_{2} ) is lighter than ( D_{2} ). B. ( H_{2} ) has low bond dissociation energy than ( D_{2} ) ( mathrm{c} cdot mathrm{H}_{2} ) is non radioactive while ( D_{2} ) is radioactive D. ( D_{2} ) has two neutrons. |
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| 303 | Which of the following will react violently with water to form a base? A. Chlorine B. cobalt c. Calcium D. Aluminum E. Potassium |
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| 304 | Which one of the following is reduced by ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) in alkaline medium? A ( cdot F e^{2} ) в. НОС( l ) ( mathbf{c} cdot K M n O_{4} ) D. ( P b S ) E ( . M n^{2+} ) |
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| 305 | The boiling point of water is inversely proportional to the atmospheric pressure. A. True B. False |
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| 306 | The density of water is not same at all temperatures because of its anomalous expansion. The density is maximum at: ( mathbf{A} cdot 0^{circ} C ) B. ( 4^{circ} mathrm{C} ) ( mathbf{c} cdot 40^{circ} C ) D. ( 100^{circ} mathrm{C} ) |
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| 307 | I ULILLLICULIS ILYAALLA Q34. Do you expect different products in solution when aluminium (III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified water (iii) alkaline water? Write equation wherever necessary. |
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| 308 | Which of the following ions forms a hydroxide that is highly soluble in water? A ( . K^{text {t }} ) в. ( Z n^{2} ) c. ( N i^{2} ) D. ( A l^{3} ) |
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| 309 | ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{O}_{2}, ) is an example of disproportionation because: A. oxidation number of oxygen only decreases B. oxidation number of oxygen only increases c. oxidation number of oxygen decreases as well as increase D. oxidation number of oxygen neither decreases nor increases |
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| 310 | Q. 28 How can production of hydrogen from water gas be increased by using water gas shift reaction? A |
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| 311 | Q. 29 What are metallic/interstitial hydrides? How do they differ from molecular hydrides? |
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| 312 | Which of the following gas is lightest? A. Dihydrogen B. Helium c. Dinitrogen D. Dioxygen |
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| 313 | Heavy water ( left(D_{2} Oright) ) is A. A product of oxygen and hydrogen. B. Ordinary water containing dissolved salts of heavy metals. C. Water of mineral springs. D. Water produced by repeated distillation and condensation. |
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| 314 | Calcium carbide is hydrolyzed using heavy water. What are the products formed? ( mathbf{A} cdot C a(O H)_{2}, C_{2} D_{2} ) B. ( C a(O D)_{2}, C_{2} D_{2} ) c. ( C a(O D)_{2}, C D_{4} ) D. ( C a(O H)_{2}, C D_{1} ) |
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| 315 | Pure water is: A. colourless and opaque B. colourless and transparent C . coloured and transparent D. colourless, odourless and transparent |
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| 316 | Intramolecular H-bonding is present in: A. ( O- ) nitrophenol в. ( H C l ) ( c . H B r ) D. ( H F ) |
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| 317 | State whether True or False. Ozone is the oxidising agent in the following reaction: ( boldsymbol{O}_{3}(boldsymbol{g})+boldsymbol{H}_{2} boldsymbol{O}_{2}(l) rightarrow boldsymbol{H}_{2} boldsymbol{O}(l)+ ) ( mathbf{2} boldsymbol{O}_{mathbf{2}}(boldsymbol{g}) ) |
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| 318 | Hydrogen peroxide oxidises ( left[boldsymbol{F e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]^{4-} ) to ( left[boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]^{3-} ) in acidic medium but reduce ( left[boldsymbol{F} e(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]^{3-} ) to ( left[boldsymbol{F} e(boldsymbol{C} boldsymbol{N})_{6}right]^{4-} ) in alkaline medium. The other products formed are, respectively: ( mathbf{A} cdot H_{2} O ) and ( left(H_{2} O+O_{2}right) ) B. ( H_{2} O ) and ( left(H_{2} O+O H^{-}right) ) ( mathrm{c} cdotleft(mathrm{H}_{2} mathrm{O}+mathrm{O}_{2}right) ) and ( mathrm{H}_{2} mathrm{O} ) D. ( left(H_{2} O+O_{2}right) ) and ( left(H_{2} O+O H^{-}right) ) |
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| 319 | Some of the major uses of heavy water are given below. Which one is not correct? A. It is used as a moderator in nuclear. B. It is used as a tracer compound for studying reaction mechanism c. High concentration of heavy water accelerates the growth of plants D. It is used in preparing deuterium |
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| 320 | Hydrogen is present in the form in free state. ( mathbf{A} cdot H ) в. ( H_{2} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) D. ( H^{+} ) |
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| 321 | Why is Hydrogen placed in group ( I ) of the modern periodic table ? | 11 |
| 322 | ( H_{2} O_{2} ) turns starch iodide paper to green colour. If this is true enter 1 , if false enter 0 . |
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| 323 | The physical state of water is liquid at which of the following temperatures? ( A cdot 25^{circ} C ) B. ( 0^{circ} mathrm{C} ) ( mathbf{c} cdot 100^{circ} c ) D. none of these |
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| 324 | If 10 g of a sample of water contains 16.2 gof ( boldsymbol{C a}left(boldsymbol{H} boldsymbol{C O}_{3}right)_{2}, ) then the hardness of water is: A. 200 ppm B. 300 ppm c. 60 ppm D. 100 ppm |
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| 325 | The oxide that gives ( H_{2} O_{2} ) on treatment with dilute ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) is: ( mathbf{A} cdot P b O_{2} ) в. ( B a O_{2} .8 H_{2} O ) c. ( M n O_{2} ) D. ( T i O_{2} ) |
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| 326 | The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce dihydrogen.What volume of dihydrogen at ( 20^{circ} C ) and one bar will be released when ( 0.15 g ) of aluminium reacts? |
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| 327 | 10 L of hard water with temporary hardness of ( left[boldsymbol{C a}left(boldsymbol{H} boldsymbol{C O}_{3}right)_{2}right] ) requires ( 0.56 mathrm{g} ) of lime. The reaction follows as: ( boldsymbol{C a}left(boldsymbol{H C O}_{3}right)_{2}+boldsymbol{C a O} longrightarrow boldsymbol{2} boldsymbol{C a} boldsymbol{C O}_{3}+ ) ( boldsymbol{H}_{2} boldsymbol{O} ) Temporary hardness in terms of ppm of ( boldsymbol{C a} boldsymbol{C O}_{3} ) is: ( A .56 ) ppm B. ( frac{1}{2} ) ppm c. 100 ppm D. 200 ppm |
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| 328 | The radio active isotope of hydrogen is A. protium B. deuterium c. tritium D. none of these |
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| 329 | Which ionic hydride is stable upto its melting point? ( mathbf{A} cdot N a H ) в. ( C a H_{2} ) c. ( L i H ) D. ( B a H_{2} ) |
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| 330 | 2.21 Which of the following statement(s) is/are correct in the case of heavy water? (a) Heavy water is used as a moderator in nuclear reactor (b) Heavy water is more effective as solvent than ordinary water (c) Heavy water is more associated than ordinary water (d) Heavy water has lower boiling point than ordinary water |
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| 331 | In complex hydrides, hydride ions act as ligand and are coordinated to metal ions. These hydrides are good reducing agents. Which of the following hydrides is not a complex hydride? A ( . ) Li ( A I H_{4} ) в. ( N a B H_{4} ) ( mathrm{c} cdotleft(A l H_{3}right)_{n} ) D. ( L i B H_{4} ) |
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| 332 | The structure of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A. planar B. non-planar c. spherical D. linear |
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| 333 | Only one element of forms hydride. A. group 6 в. group 7 c. group 8 D. group |
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| 334 | Water gas is a mixture of: A. carbon dioxide and hydrogen B. carbon monoxide and hydrogen c. carbon and hydrogen D. ammonia and hydrogen |
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| 335 | Q4. Complete the following reactions: (i) SiCl, + LiAlH (ii) MgN, + H20 – (iii) NaH + CO —— |
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| 336 | 0.7 The oxide that gives H,O, on treatment with dilute H2SO4 is (a) PbO2 (b) BaO,.8H2O + 0, (c) MnO2 (d) TiO2 le or |
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| 337 | Which of the following statement is correct regarding properties of hydrogen? A. Hydrogen can behave as a non-metal B. Hydrogen can behave as a metal c. Hydrogen can behave as a metalloid D. None of the above |
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| 338 | Gas, which in cold(liquid form) expands on further cooling is: A. Liquid Heliumm B. Liquid Hydrogen c. Liquid Ammonia D. Liquid Oxygen |
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| 339 | Q.56 Why can dilute solutions of hydrogen peroxide not be concentrat.d by heating? How can a concentrated solution of hydrogen peroxide be obtained? |
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| 340 | Q30. Knowing the properties of H,O and D,O, do you think D, can be used for drinking purpose. | 11 |
| 341 | Which of the following types of water is not in its free state? A . River water B. Well water c. Distilled water D. Rain water |
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| 342 | Which of the following is an atom of tritium? ( A ) в. ( c ) D. |
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| 343 | Hyperol is an addition product of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) with : A. ethanol B. urea c. ethylene. D. ammonia |
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| 344 | Q7. Water molecule is bent, not linear. Explain? | 11 |
| 345 | 0.23 Some of the properties of water are described below. Which of them is/are not correct? (a) Water is known to be a universal solvent (b) Hydrogen bonding is present to a large extent in liquid water (c) There is no hydrogen bonding in the frozen state of water (d) Frozen water is heavier than liquid water |
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| 346 | ( H_{2} O_{2} ) is a stronger reducing agent and a weaker oxidizing agent. If this is true enter 1 , if false enter 0 . |
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| 347 | At ( ^{0} C ) water has its maximum density and its minimum volume A . 40 B. 4 c. 14 D . 24 |
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| 348 | Which one of the following reactions represents the oxidising property of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ? ) ( mathbf{A} cdot 2 K M n O_{4}+3 H_{2} O_{4}+5 H_{2} O_{2} rightarrow K_{2} S O_{4}+ ) [ 2 M n S O_{4}+8 H_{2} O+5 O_{2} ] B. [ 2 K_{3}left[F e(C N)_{6}right]+2 K O H+H_{2} O_{2} rightarrow 2 K_{4}left[F e(C N)_{6}right]+ ] ( 2 H_{2} O+O_{2} ) ( mathbf{c} cdot P b O_{2}+H_{2} O_{2} rightarrow P b O+H_{2} O+O_{2} ) D. ( 2 K I+H_{2} S O_{4}+H_{2} O_{2} rightarrow K_{2} S O_{4}+I_{2}+2 H_{2} O ) |
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| 349 | A cloudy or milky appearance characterizes: A. soft water B. hard water c. chlorinated water D. both a and c |
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| 350 | Which halogen reacts only partially with hydrogen even at high temperature and in the presence of a catalyst? ( A cdot F_{2} ) в. ( mathrm{Cl}_{2} ) ( c cdot operatorname{Br}_{2} ) D. I ( _{2} ) |
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| 351 | Hardness of water can be detected with: A. ( N a_{2} C O_{3} ) solution B. soap water c. dil. ( H C l ) D. acidified ( K M n O_{4} ) solution |
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| 352 | How can saline hydrides remove traces of water from organic compounds? | 11 |
| 353 | Heavy water is used as a: A. fuel in engines B. semiconductor c. moderator in nuclear reactors D. insulator in steam engines |
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| 354 | ( 6 mathrm{ml} ) of a standard soap solution ( (1 mathrm{ml} ) ( =0.001 mathrm{g} ) ) of ( mathrm{CaCO}_{3} ) were required in titrating ( 50 mathrm{ml} ) of water to produce a good lather. Its degree of hardness is: A. 120 ppm В. 100 ppm c. 50 ppm D. 60 ppm |
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| 355 | of Q. 31 Hydrogen gas is prepared in the laboratory by reacting dilute HCL with granulated zinc. Following reaction takes place Zn+ 2HCl – ZnCl2 + H2 Calculate the volume of hydrogen gas liberated at STP when 32.65 g of zinc reacts with HCl. 1 mol of a gas occupies 22.7 L volume at STP; atomic mass of Zn= 65.3u |
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| 356 | The boiling point of heavy water is? ( mathbf{A} cdot 100^{0} C ) в. ( 101.4^{circ} mathrm{C} ) ( mathbf{c} cdot 99^{0} C ) D. ( 110^{circ} mathrm{C} ) |
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| 357 | Tritium is obtained by: A. Nuclear reactions B. Passing steam over heated ( C ) C. Action of ( N a O H ) on ( ^{prime} A l^{prime} ) D. Action of ( H_{2} S O_{4} ) on ( ^{prime} Z n^{prime} ) |
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| 358 | Which of the following statement is not correct regarding hydrogen atom? A. It resembles with halogens in some properties B. It resembles with alkali metals in some properties C. It cannot be placed in first group of periodic table D. It is the lightest element |
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| 359 | Hydrogen gas will not reduce: A. heated cupric oxide B. heated ferric oxide C. heated stannic oxide D. heated aluminium oxide |
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| 360 | Density of water in the solid state is………….. than the density of water in the liquid state A. higher B. lower c. same D. none of these |
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| 361 | A volume of ( 100 mathrm{L} ) of hard water requires ( 5.6 mathrm{g} ) of lime for removing temporary hardness. The temporary hardness in ppm of CaCO3CaC03 is: A . 56 B. 100 ( c cdot 200 ) D. 112 |
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| 362 | Assertion The present position of hydrogen in the modern periodic table is completely justifiable. Reason Hydrogen is a metallic diatomic element. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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| 363 | Which of the following compounds take part in exchange reaction with ( D_{2} O ? ) A . ( N a O H ) в. ( H_{3} P O_{2} ) c. ( H_{3} P O_{3} ) D. All the above |
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| 364 | Hydrogen burns in air with a: A. light bluish flame B. yellow flame c. crimson red flame D. green flame |
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| 365 | Hydrogen gas is: A. has high molecular weight. B. a medium for storage of energy C. excellent fuel D. both B and C |
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| 366 | Select the correct reaction(s) for ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) This question has multiple correct options A. ( A g_{2} O+H_{2} O_{2} rightarrow 2 A g+H_{2} O+O_{2} ) в. ( C l_{2}+H_{2} O_{2} rightarrow 2 H C l+O_{2} ) c. ( O_{2}+H_{2} O_{2} rightarrow H_{2} O+2 O_{2} ) D. ( H_{2} O_{2}+2 K I rightarrow 2 K O H+I_{2} ) |
11 |
| 367 | Temporary hardness of water is due to the presence of the sulphates of Ca and Mg. If this is true enter 1 , if false enter 0 . |
11 |
| 368 | How many liters of hard water may contain ( 60 mathrm{mg} ) of ( mathrm{Mg} mathrm{SO}_{4} ) in order to have a degree of hardness of 25 ppm? |
11 |
| 369 | Suggest reasons for and against the inclusion of hydrogen in the main groups of the periodic table. |
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| 370 | Water bodies like sea, rivers etc., which are deep appear blue. Why? |
11 |
| 371 | 21. The process of heating coal in the absence of air is called (a) Fractional distillation (b) Distillation (c) Destructive distillation (d) None of these |
11 |
| 372 | 8. Zeolite is (a) hydrated sodium aluminium silicate – Na, Al,Si,Og xH, (b) hydrated ferric oxide (C) sodium hexametaphosphate (d) sodium tetraborate |
11 |
| 373 | Chemical A is used for softening of water to remove temporary hardness. reacts with sodium carbonate to produce caustic soda, when ( C O_{2} ) is bubbled through ‘A’, it turns cloudy. Chemically ‘A’ is: A. ( C a O ) в. ( C a C O_{3} ) c. ( operatorname{Ca}left(H C O_{3}right)_{2} ) D. ( C a(O H)_{2} ) |
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| 374 | Which is true statement about ( boldsymbol{H}_{2} boldsymbol{O} ) ? A. Hardness can be removed by passing through ion exchange resin B . Its pressure can be detected by anhydrous ( C u S O_{4} ) c. It is amphoprotic D. All of the above |
11 |
| 375 | A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly: A . 1% B. 3% c. ( 10 % ) D. 90% |
11 |
| 376 | Q Type your question performed the above experiment with two different solutions (Y). If in the case of Nikita, solution(Y) is dilute hydrochloric acid and in case of Tarun, solution (Y) is sodium hydroxide then compounds formed are and ( _{–}-_{-} ) respectively A. ( N a_{2} Z n O_{2} ) and ( Z n C l_{2} ) в. ( Z n C l_{2} ) and ( N a_{2} Z n O_{2} ) c. ( Z n S O_{4} ) and ( N a_{2} Z n O_{2} ) D. ( Z n C l_{2} ) and ( Z n O ) |
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| 377 | In hydrogen economy, energy required for automobiles or electrical energy is obtained from the reaction between and oxygen. A. hydrogen B. oxygen c. silver D. none of these |
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| 378 | On shaking ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) with acidified potassium dichromate and ether, etheral layer becomes: A. green B. red c. blue D. brown |
11 |
| 379 | The products formed when heavy water is reacted with magnesium nitride, is/are A ( cdot N H_{3} M g(O H)_{2} ) В ( cdot operatorname{NH}_{3} M g(O D)_{2} ) ( mathbf{c} cdot_{N D_{3}} M g(O H)_{2} ) D. ( _{N D_{3} M g}(O D)_{2} ) |
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| 380 | Assertion Hydrogen resembles both, alkali metals as well as halogens. Reason Hydrogen forms oxides, halides and sulphides, and exists as diatomic molecule. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 381 | The standard potential of the reaction: ( H_{2} O+e^{-} rightarrow frac{1}{2} H_{2}+O H^{-} ) at ( 298 mathrm{K} ) by using ( boldsymbol{K}_{boldsymbol{w}}left(boldsymbol{H}_{2} boldsymbol{O}right)=mathbf{1 0}^{-14} ) ( A .-0.828 V ) в. 0.828 v c. ( 2.0 v ) D. -0.5 |
11 |
| 382 | NI Q. 11 Which of the following reactions increases prou Following reactions increases production of dihydrogen from synthesis gas? (a) CH2(g) + H2O(g) – 1270K CO(g) + 3H2(g) (b) C(s) + H2O(g) – 1270 K CO(g) + Hig) (c) CO(g) + H2O(g) 673K CO2(g) + H2(g) Catalyst (d) C,H, + 2H,O 1270 K + 2CO + 5H, Ni li |
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| 383 | State True or False. ( H^{-} ) is unstable in water A. True B. False |
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| 384 | Assertion: Hydrogen is a diatomic molecule Reason: Protium atom contains one |
11 |
| 385 | Heavy water is called so because: A. it has dissolved salts in it B. it is an oxide of heavy hydrogen C. it is a hydride of heavy oxygen D. all of the above |
11 |
| 386 | The name ” Hydrogen” was given by A. Cavendish B. Lavoisier c. Urey D. Dalton |
11 |
| 387 | Match the following. List List I |
11 |
| 388 | Q1. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration. | 11 |
| 389 | Carbon hydrides of the type, ( C_{n} H_{2 n+2} ) do not act as Lewis acid or Lewis base.They behave as normal carbon hydrides because: A. carbon hydrides are electron-rich hydrides B. carbon hydrides are electron-deficient hydrides c. carbon hydrides are electron-precise hydrides D. carbon hydrides are non-stoichiometric hydrides |
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| 390 | Assertion Hydrides of ( N, O ) and ( F ) have lower boiling points than the hydrides of their subsequent group members. Reason Boiling point depends upon the molecular mass only. |
11 |
| 391 | When water boils the temperature remains constant. Give reasons. |
11 |
| 392 | 19. Hydrogen does not combine with (a) helium (b) bismuth (c) antimony (d) sodium |
11 |
| 393 | Boiling hard water with washing soda removes permanent hardness. A. True B. False |
11 |
| 394 | Potassium on reacting with cold water catches fire and burns in a flame. Guess the colour of the flame. A. Golden yellow B. Lilac c. Brick red D. Blue |
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| 395 | What is the diameter of a hydrogen atom in nm? ( mathbf{A} cdot mathbf{1} ) B. 10 c. ( 0 . ) D. 0.01 |
11 |
| 396 | Q29. What properties of water make it useful as a solvent? What types of compound can it (i) dissolve (ii) hydrolyse? |
11 |
| 397 | Hydrogen is the most abundant element in the universe If this is true enter 1 , if false enter 0 . |
11 |
| 398 | P3 Q3. The aqueous solution of H,O, is acidic in nature. Explain with the help of example. Name two substances which catalyse the decomposition reaction of H,O, |
11 |
| 399 | Oxygen is collected by downward displacement of water since it weighs as/than air. A. heavier B. lighter c. same D. none of the above |
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| 400 | Which of the following is not a process of preparation of hydrogen peroxide? A. Auto-oxidation of 2-ethylanthraquinol. B. By passing oxygen through boiling water C. By oxidation of isopropyl alcohol D. By reaction of barium peroxide with dil. ( H_{2} S O_{4} ) |
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| 401 | In aqueous solution, ( boldsymbol{H}_{2} ) will not reduce: A ( cdot F e^{3} ) B. ( C u^{2+} ) c. ( A g^{+} ) D. ( Z n^{2+} ) |
11 |
| 402 | The hybridisation of the orbitals of oxygen in ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: ( A cdot s p^{3} d ) B . ( s p ) ( c cdot s p^{2} ) D. ( s p^{3} ) |
11 |
| 403 | A good characteristic of fuel is that it: A. leaves more ash B. leaves no ash c. is highly expensive D. none of the above |
11 |
| 404 | Q13. Which isotope of hydrogen does not have neutron? | 11 |
| 405 | ( K_{2} C r_{2} O_{7} ) turns starch iodide paper to blue colour. If this is true enter 1 , if false enter 0 . |
11 |
| 406 | Describe the different types of hydrides which are formed. | 11 |
| 407 | Bond length is more in: A. ( H-H ) B. D – D c. ( T-T ) D. same in All |
11 |
| 408 | Hydrogen undergoes both reduction and oxidation when reacted with: A. в. ( N_{2} ) ( c cdot O_{2} ) ( D cdot F_{2} ) |
11 |
| 409 | Which group hydrogen has resemblance? This question has multiple correct options A. I-A в. Il-A c. IV-A D. VII-A |
11 |
| 410 | 1. Hydrogen gas is generally prepared by the (a) reaction of granulated zinc with dilute H2SO4 (b) reaction of zinc with conc. H2SO4 (c) reaction of pure zinc with dil. H2SO4 (d) action of steam on red hot coke |
11 |
| 411 | Q. 48 Why is the ionisation enthalpy of hydrogen higher than that of sodium? Ans. The ionisation antholobudo bicher than that of madilim Both hydroman and anal |
11 |
| 412 | ( K O_{2} ) is used to bleach silk, wool, ivory and hair. If this is true enter 1 , if false enter 0 . |
11 |
| 413 | Which of the following hydrides is electron-precise hydride? A. ( B_{2} H_{6} ) в. ( N H_{3} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) D. ( C H_{4} ) |
11 |
| 414 | In which of the following reactions, ( H_{2} O_{2} ) acts as a reducing reagent? A ( cdot ) HOCl ( +H_{2} O_{2} stackrel{H^{+}}{rightarrow} H_{3} O^{+}+C l^{-}+O_{2} ) B – ( M n^{2+}+H_{2} O_{2} stackrel{text { OH }}{rightarrow} M n^{4+}+2 O H^{-} ) ( mathbf{c} cdot 2 F e^{2+}+H_{2} O_{2} stackrel{O H}{rightarrow} 2 F e^{3+}+2 O H^{-} ) D ( cdot P b S(s)+4 H_{2} O_{2}(a q) stackrel{H^{+}}{rightarrow} P b S O_{4}(s)+4 H_{2} O(l) ) |
11 |
| 415 | Last traces of water is removed from ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) by A. electrolysis B. crystallisation c. condensation D. evaporation |
11 |
| 416 | The atomic mass of deuterium isotope of hydrogen is ( 2 . ) The atomic mass of oxygen is 16. Then what is the molecular mass of heavy water? A . 16 B . 18 c. 20 D. 24 |
11 |
| 417 | The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron-chromium. What is this process called? A. Hydrogen reaction B. Water-gas shift reaction c. coal-gas shift reaction D. syn gasification |
11 |
| 418 | Sodium carbonate softens permanent hard water. A. True B. False |
11 |
| 419 | One of the following is an incorrect statement, point it out? A. Permanent hardness can be removed by boiling water. B. Hardness of water effects soap consumption. C. Temporary hardness is due to bicarbonates of ( C a ) and ( M g ) D. Permanent hardness is due to the soluble ( S O_{4}^{2-}, C l^{-} ) of ( C a ) and ( M g ) |
11 |
| 420 | Our universe is very big, with millions of bright galaxies and stars that are much bigger than the sun and the earth. The universe is made up of: A. burning coal B. hydrogen c. oxygen D. iron burning in a hot flame of oxygen |
11 |
| 421 | Which of the following is useful in explaining the polarity of water? I. The solution process. II. The ionization process. III. The high conductivity of distilled water A. I only B. II only c. I and II only D. Il and III only E. I, II and III |
11 |
| 422 | ( 25 mathrm{ml} ) of ( H_{2} O_{2} ) solution were added to excess of acidified ( K I ) solution. The iodine so liberated required ( 20 mathrm{ml} ) of ( 0.1 mathrm{N} N a_{2} S_{2} O_{3} ) for titration Calculate strength of ( H_{2} O_{2} ) in terms of normality and percentage? A. ( 0.04 mathrm{N}, 0.136 % ) В. ( 0.08 mathrm{N}, 0.136 % ) c. ( 0.04 mathrm{N}, 0.163 % ) D. ( 0.02 mathrm{N}, 0.163 % ) |
11 |
| 423 | Why is water a bent molecule and not İinear? A. Water has four electron domains repelling each other, causing the molecule to be bent. B. There are not enough electrons involved for the molecule to be linear. C. Because the oxygen in water can only make bent molecules. D. The molecule alternates in between a bent geometry and a linear geometry. |
11 |
| 424 | Q.35 Discuss briefly de-mineralisation of water by ion exchange resin. birolinodotor |
11 |
| 425 | Explain the resemblance of hydrogen to the other members of its group. | 11 |
| 426 | Water turns blue cobalt chloride paper: A. no change B. red ( c cdot operatorname{pink} ) D. orange |
11 |
| 427 | Ozone reacts with ( H_{2} O_{2} ) to give oxygen. One volume of ozone gives: A. one volume of oxygen B. half volume of oxygen C. three volumes of oxygen D. two volumes of oxygen |
11 |
| 428 | On moving from left to right in a period what is the order of acidic character of hydrides? A. ( N H_{3}<H_{2} O<H F ) в. ( H F<H_{2} O<N H_{3} ) c. ( H_{2} O<H F<N H_{3} ) D. ( H_{2} O<N H_{3}<H F ) |
11 |
| 429 | Which one of the following processes will produce hard water? This question has multiple correct options A. saturation of water with ( C a C O_{3} ) B. Addition of ( N a_{2} S O_{4} ) to water. c. saturation of water with ( M g C O_{3} ) D. saturation of water with ( C a S O_{4} ) |
11 |
| 430 | Which of the chemicals used to soften hard water? |
11 |
| 431 | ( mathbf{4} D_{2} boldsymbol{O}+mathbf{3} boldsymbol{F} boldsymbol{e} stackrel{boldsymbol{R e d} text {hot}}{boldsymbol{*}} boldsymbol{F} boldsymbol{e}_{3} boldsymbol{O}_{4}+boldsymbol{g} boldsymbol{a} boldsymbol{s} . ) The gas produced in the above reaction is: ( A cdot O_{2} ) в. ( H_{2} ) c. ( D_{2} ) D. ( T_{2} ) |
11 |
| 432 | When ( S O_{3} ) treated with ( D_{2} O, ) the products are: A. deutero sulphuric acid B. deuterium sulphuric acid c. deuterium and sulphuric acid D. ( D_{2} S O_{3} ) |
11 |
| 433 | 10. The decomposition of H,O, is retarded by (a) acetanilide (b) glycerol (c) sodium bicarbonate (d) oxalic acid |
11 |
| 434 | Which of the gases listed below would not be collected via water displacement? A ( . C O_{2} ) в. ( C H_{4} ) ( c cdot O_{2} ) D. ( N H_{3} ) E ( . H_{2} ) |
11 |
| 435 | Which of the following is laboratory preparation of dihydrogen? A ( cdot 3 F e+4 H_{2} O(text {steam}) rightarrow F e_{3} O_{4}+4 H_{2} ) в. ( 2 N a+2 H_{2} O rightarrow 2 N a O H+H_{2} ) c. ( C a H_{2}+2 H_{2} O rightarrow C a(O H)_{2}+2 H_{2} ) D. ( Z n+H_{2} S O_{4}(d i l .) rightarrow Z n S O_{4}+H_{2} ) |
11 |
| 436 | In context with the industrial preparation of hydrogen from water gas ( left(C O+H_{2}right), ) which of the following is the correct statement? ( mathbf{A} cdot mathrm{H}_{2} ) is removed through occlusion with ( mathrm{Pd} ) B. ( C O ) is oxidised to ( mathrm{CO}_{2} ) with steam in the presence of a catalyst followed by absorption of ( mathrm{CO}_{2} ) in alkal C ( cdot C O ) and ( mathrm{H}_{2} ) are fractionally separated using differences in their densities D. ( C O ) is removed by absorption in aqueous ( mathrm{Cu}_{2} mathrm{C} 1_{2} ) solution |
11 |
| 437 | Presence of magnesium chloride in water makes it temporary hard. A. True B. False |
11 |
| 438 | Complete the following chemical reactions. Classify the below into (a) hydrolysis, (b) redox and (c) hydration reactions. (i) ( P b S(s)+H_{2} O_{2}(a q) rightarrow ) (ii) ( M n O_{4}^{-}(a q)+H_{2} O_{2}(a q) rightarrow ) (iii) ( boldsymbol{C a O}(boldsymbol{s})+boldsymbol{H}_{2} boldsymbol{O}(boldsymbol{g}) rightarrow ) (iv) ( A l C l_{3}(g)+H_{2} O(l) rightarrow ) ( (v) C a_{3} N_{2}(s)+H_{2} O(l) rightarrow ) |
11 |
| 439 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A . an oxiding agent B. both oxidising and reducing agent C . reducing agent D. none of the above |
11 |
| 440 | Which of the following compound gives ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) by the addition of ( boldsymbol{H}_{2} boldsymbol{O} ? ) A ( cdot C Oleft(N H_{2}right)_{2} cdot H_{2} O_{2} ) в. ( N a_{2} H P O_{4} . H_{2} O_{2} ) ( mathrm{c} cdotleft(N H_{4}right)_{2} S O_{4} cdot H_{2} O_{2} ) D. All of the above |
11 |
| 441 | Which one of the following pairs of reactants does not produce oxygen when they react with each other? A ( cdot F_{2}, ) NaOH solution (hot, conc. В. ( F_{2}, H_{2} O ) c. ( C l_{2}, ) NaOH solution (cold, dilute) D. ( C a O C l_{2}, H_{2} S O_{4} ) (dilute, small amount) |
11 |
| 442 | The product formed when ( H_{2} O_{2} ) reacts with acidified ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) is: A ( cdot K_{2} C r_{2} O_{4} ) в. ( C r O_{3} ) ( mathbf{c} cdot operatorname{Cr}(O H)_{3} ) D. ( C r O_{5} ) |
11 |
| 443 | Which of the following statements about hydrogen is incorrect? A. Hydrogen has three isotopes of which tritium is the most common B. Hydrogen never acts as cation in ionic salts C. Hydronium ion, ( H_{3} O^{+} ) exists freely in solution D. Dihydrogen does not act as a reducing agent |
11 |
| 444 | In context with the industrial preparation of hydrogen from water gas ( left(C O+H_{2}right), ) which of the following is the correct statement? ( mathbf{A} cdot mathrm{CO} ) and ( mathrm{H}_{2} ) are fractionally separated using differences in their densities B. ( mathrm{CO} ) is removed by absorption in aqueous ( mathrm{Cu}_{2} mathrm{Cl}_{2} ) solution C ( . H_{2} ) is removed through occulsion with Pd D. ( C O ) is oxidised to ( C O_{2} ) with steam in the presence of a catalyst followed by absorption of ( C O_{2} ) in alkali |
11 |
| 445 | ( H_{2} O_{2} ) has greater reactivity in acidic medium. It is because acids catalyse the decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) A. True B. False |
11 |
| 446 | Both temporary and permanent hardness in water is removed by A. boiling B. filtration c. distillation D. decantation |
11 |
| 447 | Among the following elements, which one has the highest ionisation potential? A. Hydrogen B. Lithium c. Potassium D. sodium |
11 |
| 448 | Assertion NaBO ( _{3} / O H^{-} ) can be used for oxidation of ( C r^{3+} ) to ( C r^{6}+ ) Reason In alkaline medium ( N a B O_{3} ) produces ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 449 | In what respect is the electronic configuration of hydrogen and halogens similar? A. Hydrogen and halogens have one electron in their outermost shell B. Hydrogen and halogens have one electron less than noble gas configuration C. Hydrogen and halogens can lose one electron D. Hydrogen and halogens show noble gas configuration |
11 |
| 450 | The colour of hydrogen is: A . yellow B. orange ( c cdot ) red D. None of the above |
11 |
| 451 | ( H_{2} ) does not show litmus test. From this, we can say, that the oxide of hydrogen is in nature. A . acidic B. neutral c. basic D. amphoteric |
11 |
| 452 | What is meant by demineralised water and how can it be obtained? | 11 |
| 453 | Assertion Heavy water is used as a moderator in nuclear reactors. Reason Heavy water is made of an isotope of helium. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 454 | Hydrogen differs from elements of ( 1-A ) group as: This question has multiple correct options A. hydrogen is gas but others are solid at room temperature B. all are metals C. hydrogen is a non-metal but others are metal D. they donate one electron to become cation |
11 |
| 455 | Heavy water is: A. water with mercury compounds B. water with chlorides and sulphates of Ca and Mg C. water with bicarbonates of Ca and Mg D. deuterium oxide |
11 |
| 456 | Compounds such as alcohols and glucose also contain hydrogen, but are not categorized as acids. Describe an activity to prove it. |
11 |
| 457 | ( F e^{3+} ) is reduced to ( F e^{2+} ) by using: This question has multiple correct options ( mathbf{A} cdot H_{2} O_{2} ) is presence of ( N a O H ) B. ( N a_{2} O_{2} ) in water ( mathrm{C} cdot mathrm{H}_{2} mathrm{O}_{2} ) in presence of ( mathrm{H}_{2} mathrm{SO}_{4} ) D. ( N a_{2} O_{2} ) in presence of ( H_{2} S O_{4} ) |
11 |
| 458 | What happens when zinc or iron react with dilute sulphuric acid.Explain your answer by giving suitable chemical equation. Why does copper not show similar behaviour? |
11 |
| 459 | In the following reaction ( H_{2} O_{2} ) acts as: ( A g_{2} O+H_{2} O_{2} rightarrow 2 A g+H_{2} O+O_{2} ) A. oxidising agent B. reducing agent c. bleaching agent D. none |
11 |
| 460 | Pure water is a of electricity. A. good B. badd c. semi D. very good |
11 |
| 461 | Q11. What do you understand by the term ‘non-stoichiometric hydrides’? Do you expect this type of hydrides to be formed by alkali metals? Justify your answer. 11 |
11 |
| 462 | Q2. What is the importance of heavy water with regard to nuclear power generation? Ans. It is ucada anto the lorrection |
11 |
| 463 | Which of the following is used in the hydrogenation of vegetable oils? A ( cdot C l_{2} ) в. ( N_{2} ) ( c cdot O_{2} ) D. ( H_{2} ) |
11 |
| 464 | Q10. Do you expect the carbon hydride of type C H answer. +, to act as ‘Lewis’ acid or base? Justify your 2414 |
11 |
| 465 | As many as different combination of water are possible from ( 1 H^{1},_{1} H^{2},_{1} H^{3} ) and ( _{8} O^{16},_{8} O^{17} ) and ( _{8} O^{18} ) A ( cdot 12 ) B. 32 ( c cdot 18 ) D. 15 |
11 |
| 466 | Q. 6 Consider the reactions (i) H,02 + 2HI I2 + 2H,0 (ii) HOCL+H,02 H 30* + Clº+02 Which of the following statements is correct about H20, with reference to these reactions? Hydrogen peroxide is ……… (a) an oxidising agent in both (i) and (ii) (b) an oxidising agent in (i) and reducing agent in (ii) (c) a reducing agent in (i) and oxidising agent in (ii) (d) a reducing agent in both (i) and (ii) |
11 |
| 467 | Hydrogen could well be a fuel for the future. Which of the following statement is true about the potential use of hydrogen as a fuel? A. Easily liquefiable B. Produces lots of green house gases on combustion c. Explosive when mixed with air D. All of the above |
11 |
| 468 | ( H_{2} O_{2} ) and heavy water was discovered by respectively: A. Thenard, Urey B. Urey, Rutherford c. Aston, Urey D. Aston, Chadwick |
11 |
| 469 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) turns acidified ( boldsymbol{T} boldsymbol{i} boldsymbol{O}_{2} ) solution to orange coloured pertitanic acid ( left[boldsymbol{H}_{2} boldsymbol{T} boldsymbol{i} boldsymbol{O}_{4}right] ) A. True B. False |
11 |
| 470 | One litre of a sample of hard water contain ( 4.44 m g C a C l_{2} ) and ( 1.9 m g ) of ( M g C l_{2}, ) what is the total hardness in terms of ppm of ( boldsymbol{C} boldsymbol{a} boldsymbol{C O}_{3} ) ( A cdot 2 ) ppm B. 3 ppm c. 4 ppm D. 6 ppm |
11 |
| 471 | Salts of calcium and magnesium like cause harness of water This question has multiple correct options A. bicarbonates B. chlorides c. sulphates D. phosphates |
11 |
| 472 | 01 We douve 1 4. On treatment of hard water with zeolite, sodium ions get exchanged with (a) Ca2+ ions (b) Mg2+ ions (c) H ions (d) OH |
11 |
| 473 | Dry hydrogen can oxidise copper oxide to form metal. A. copper B. zinç c. carbon D. Boron |
11 |
| 474 | The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce dihydrogen. What volume of dihydrogen at ( 20 C ) and one bar will be released when ( 0.15 g ) of aluminium reacts? |
11 |
| 475 | Which of the following has highest calorific value? A. Animal fat B. Hydrogengas c. Gasoline D. coal |
11 |
| 476 | What is the composition of water? In what volume are its two constituent combined? |
11 |
| 477 | 2. 20 Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H, gas is formed. It is known as (a) water gas (b) syn gas (c) producer gas (d) industrial gas |
11 |
| 478 | In the laboratory prepration of hydrogen, pure zinc is not used because: A. pure zinc becomes passive due to formation of oxide layer B. pure zinc becomes passive due to the formation of sulphate layer over the metal C. pure zinc reacts slowly with the acid D. pure zinc reacts with acid vigorously and violently |
11 |
| 479 | The properties or physical constants which are lower for hydrogen than that of deuterium are: This question has multiple correct options A. Activation energy B. Melting point c. Latent heat of fusion D. Number of neutrons |
11 |
| 480 | Match the following. | 11 |
| 481 | A majority of farmers in India depend upon for irrigating their crops. A . rains B. tube wells c. hand pumps D. canals |
11 |
| 482 | Which scientist established the name Hydrogen’ meaning ‘water producer’? A. Robert Boyle B. Henry Cavendish c. Lavoiser D. None of the above |
11 |
| 483 | The hydride ion ( H^{-} ) is stronger base than hydroxide ion ( O H^{-} . ) Which of the following reaction will occur if sodium hydride ( (N a H) ) is dissolved in water? A ( cdot H^{-}(a q .)+H_{2} O rightarrow H_{3} O^{-} ) B . ( H^{-}(a q .)+H_{2} O(l) rightarrow O H^{-}+H_{2} ) c. ( H^{-}+H_{2} O rightarrow ) No reaction D. None of the above |
11 |
| 484 | . 69 Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain. |
11 |
| 485 | The total number of isotopes of hydrogen and the number of radioactive isotopes among them, respectively, are: A . 2 and 0 B. 3 and 2 ( c .3 ) and 1 D. 2 and 1 |
11 |
| 486 | Q1. Show how H,O, functions both as a reducing and as an oxidising agent. | 11 |
| 487 | The specific heat capacity of water is: A. 1 calorie ( g^{-1} ) B. 10 calories ( g^{-1} ) c. 2 calories ( g^{-1} ) D. 30 calorie ( g^{-1} ) |
11 |
| 488 | Excess of ( K I ) and ( d i l . H_{2} S O_{4} ) were ( operatorname{mixed} operatorname{in} 50 m L H_{2} O_{2} . ) The liberated ( I_{2} ) required ( 20 m L ) of ( 0.1 N N a_{2} S_{2} O_{3} ) Find out the strength of ( H_{2} O_{2} ) in ( boldsymbol{g} ) per litre. |
11 |
| 489 | Water is a kind of ( _{-1-} ) oxide. A. acidic B. basic c. neutral D. metal |
11 |
| 490 | A teacher one day pointed out to his students the peculiar fact that water is a unique liquid that freezes exactly at ( 0^{circ} mathrm{C} ) and boils exactly at ( 100^{circ} mathrm{C} . ) He asked the students to find the correct statement based on this fact. Which of the statements is true regarding the above fact? A. Water dissolves anything however sparingly the dissolution may be B. Water is a polar molecule. C. Boiling and freezing temperatures of water were used to define a temperature scale. D. Liquid water is denser than ice |
11 |
| 491 | 20. Under what conditions of temperature and pressure, the formation of atomic hydrogen from molecular hydrogen will be favoured more? (a) High temperature and low pressure (b) Low temperature and low pressure (c) High temperature and high pressure (d) Low temperature and high pressure |
11 |
| 492 | Which isotope of hydrogen is used to make self-luminous paint? A. Tritium B. Protium c. Deuterium D. None of the above |
11 |
| 493 | process is used for the removal of hardness of water. A. Calgon B. Baeyer c. serpeck D. Hoope |
11 |
| 494 | Assertion Spectator ions are the species that are present in the solution but do not take part in the reaction. Reason The phenomenon of formation of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) by the oxidation of ( H_{2} O ) is known as auto-oxidation. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion c. Assertion is correct, but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 495 | Dry hydrogen can oxidise copper oxide to form copper metal. A . True B. False |
11 |
| 496 | 2. Hydrogen is (a) An element (b) Diatomic element (c) Gas at room temperature (d) A non-metal |
11 |
| 497 | Which of the following have peroxy linkages? This question has multiple correct options A ( . K O_{2} ) в. ( R u O_{4} ) c. ( B a O_{2} ) D. ( H_{3} P O_{5} ) |
11 |
| 498 | Hydrogen is produced by the reaction: A. ( N a_{2} O_{2}+2 H C l ) в. ( M g+H_{2} O ) ( mathrm{c} cdot B a O_{2}+H C l ) D. ( H_{2} S_{4} O_{8}+H_{2} O ) |
11 |
| 499 | Heavy water is used as ir nuclear reactor |
11 |
| 500 | Name the gas that is produced in the following cases.
At the anode during the electrolysis of acidified water |
11 |
| 501 | Amongst the following the total number of elements, which produce ( boldsymbol{H}_{2} ) gas with sodium hydroxide is: ( mathrm{Zn}, mathrm{Al}, mathrm{Sn}, mathrm{Pb}, mathrm{P}, mathrm{Si} ) A. 3 B. 4 ( c cdot 5 ) ( D cdot 6 ) |
11 |
| 502 | Solubility of ( N a C l ) in ( D_{2} O, ) compared with its solubility in ( H_{2} O ) is: A . less B. equal c. more D. cannot be predicted |
11 |
| 503 | Give uses of heavy water. | 11 |
| 504 | Hydrogen from ( H C l ) can be prepared by A . ( M g ) в. ( C u ) ( c . P ) D. ( P t ) |
11 |
| 505 | In which of the following reactions does hydrogen act as an oxidising agent: ( mathbf{A} cdot H_{2}+F_{2} longrightarrow ) B. ( H_{2}+S i C I_{2} longrightarrow ) ( mathbf{c} cdot N a_{2}+H_{2} longrightarrow ) ( mathbf{D} cdot C u O+H_{2} longrightarrow ) |
11 |
| 506 | Hydrogen blow torch is based on: A. short bond length of ( H_{2} ) B. high bond energy of ( H_{2} ) C . high calorific value of ( H_{2} ) D. least molecular weight |
11 |
| 507 | From group 6 only one metal forms hydride. This metal is: A. Mo в. ( c cdot c r ) D. ( c o ) |
11 |
| 508 | Write the names of isotopes of hydrogen.What is the mass ratio of these isotopes? | 11 |
| 509 | Statement-1: ( C a H_{2} ) is used as main source to transport gas as 1 pound of it gives 16.5 cubic feet ( boldsymbol{H}_{2} ) Statement-2: It is difficult to transport |
11 |
| 510 | Approximately what percent of the universe is believed to consist of hydrogen? A . 25% B. 50% c. 75% D. 90% |
11 |
| 511 | Electronic configuration of deuterium is A ( cdot 1 s^{2} ) B. ( 1 s^{text {। }} ) c. ( 1 s^{2} 2 s^{text {। }} ) D. ( 1 s^{2} 2 s^{2} ) |
11 |
| 512 | Under what conditions can hydrogen be made to combine with sulphur? | 11 |
| 513 | Q7. Give two advantages of using hydrogen over gasoline as a fuel. | 11 |
| 514 | Which of the following reactions is an example of use of water gas in the synthesis of other compounds? A ( cdot C H_{4}(g)+H_{2} O_{(g)} frac{frac{1272 k}{N i}}{N} C O(g)+H_{2}(g) ) B. ( C O_{4}(g)+H_{2} O_{(g)} frac{673 k}{text { Cactlyst }} C O_{2}(g)+H_{2}(g) ) c. ( left.C_{n} H_{2 n+2}+n H_{2} O_{(} gright) frac{1270 k}{N i} n C O+(2 n+1) H_{2} ) D. ( C O(g)+2 H_{2}(g) frac{text { cobalt }}{text { catalyst }} C H_{3} O H(l) ) |
11 |
| 515 | As many as different combination of water are possible from ( 1 H^{1}, 1 H^{2}, 1 H^{3} ) and ( _{8} O^{16},_{8} O^{17} ) and ( _{8} O_{18} ) |
11 |
| 516 | Hard water when passed through ion exchange resin containing ( R C O O H ) group, becomes free from : A ( cdot C l ) B. ( S O_{4}^{-2} ) ( mathrm{c} cdot mathrm{H}_{3} mathrm{O}^{+} ) D. ( C a^{+2} ) |
11 |
| 517 | Statement 1: The reaction of hydrogen with oxygen to form water is an exothermic reaction Statement 2: Water molecules have polar covalent bonds. A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1 B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1. c. Statement 1 is correct but Statement 2 is not correct. D. Statement 1 is not correct but Statement 2 is correct. E. Both the Statement 1 and Statement 2 are not correct. |
11 |
| 518 | 15 15C CCCC Q20. Complete the following chemical reactions. (i) PbS(s) + H,O, (aq) → (ii) Mno, (aq) + H,0, (aq) → (iii) CaO(s) + H,O(g) » (iv) AICI3(8) + H201) ► (v) Ca, N,(s) + H2O(1) ► Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions. AUTOT |
11 |
| 519 | In which of the following way, the transportation of hydrogen gas do not take place? A. Liquid B. Gas c. compressed gas D. Pressurized gas |
11 |
| 520 | The hydride ion, ( H^{-} ) is a stronger base than its hydroxide ion ( O H^{-} . ) Which of the following reactions will occur, if sodium hydride ( (N a H) ) is dissolved in water? ( mathbf{A} cdot H_{(a q)}^{-}+H_{2} O rightarrow H_{3} O ) B. ( H_{(a q)}^{-}+H_{2} O_{(l)} rightarrow O H^{-}+H_{2} ) ( mathbf{c} cdot H^{-}+H_{2} O_{(l)} rightarrow ) no reaction D. None of the above |
11 |
| 521 | Q Type your question ( 2 H_{2} O_{2} rightarrow 2 H_{2} O+O_{2}(g) Delta H= ) ( -99 k j / ) mole ( , Delta s=+69 J K^{-1} ) mole ( ^{-1} ) Addition of solution of KI causes ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) to decompose very rapidly as well Step -1 (slow) ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{l} rightarrow boldsymbol{l} boldsymbol{O}+boldsymbol{H}_{2} boldsymbol{O} ) Step -2 (fast) ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{l} boldsymbol{O} rightarrow boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{r}+boldsymbol{O}_{2}(boldsymbol{g}) ) Overall reaction: ( 2 H_{2} O_{2} rightarrow H_{2} O+O_{2}(g) ) The above experiment causes a big fluff of foam to spiral out of the beaker Elephant toothpaste reaction) Identify the wrong statement. rhis question has multiple correct options A ( cdot H_{2} O_{2} ) is thermodynamically and kinetically unstable B. LO (aq) is the reaction intemediate c. the elephant tooth paste is hot to toch D. a glowing splint if plunged into the elephant toothpaste will catch fire |
11 |
| 522 | Which of the following statements concerning protium, deuterium and tritium is not true? A. They are isotopes of each other B. They have similar electronic configurations c. They exist in the nature in the ratio of 1: 2: 3 D. Their mass numbers are in the ratio of 1: 2: 3 |
11 |
| 523 | Calgon removes hardness by forming complex compounds with the ( C a^{2+} ) and ( M g^{2+} ) ions of hard water or by adsorption. A. True B. False |
11 |
| 524 | The name hydrogen was proposed by A. Lavoisier B. Rutherford c. Henry cavandish D. scheele |
11 |
| 525 | The hardness of water caused by 0.25 moles of ( M g C l_{2} ) is equal to : 1) the hardness of water caused by 25 grams of ( boldsymbol{C a} boldsymbol{C O}_{3} ) II) the hardness of water caused by 0.25 moles of ( boldsymbol{C a C O}_{3} ) III) the hardness of water caused by 1 moles of ( boldsymbol{C a} boldsymbol{C O}_{3} ) A. only II is correct. B. I and II are correct. c. I and III are correct. D. only I is correct. |
11 |
| 526 | Active hydrogen is: A. hydrogen with unit positive charge B. hydrogen with unit negative charge C . a atomic hydrogen D. a molecular hydrogen |
11 |
| 527 | Which of the following types of hydrogen requires maximum energy for its formation? A. Nascent hydrogen B. Atomic hydrogen c. ortho hydrogen D. Parahydrogen |
11 |
| 528 | ( H_{2} ) gas is liberated at cathode and anode both by electrolysis of the following aq. solution except in: A. ( N a H ) в. ( H C O O N a ) c. ( N a C l ) D. LiH |
11 |
| 529 | The electronic configuration is ( 1 s^{1} ) for A. protium atom B. deuterium atom c. tritium atom D. all of the above |
11 |
| 530 | Consider the following statements: i) Atomic hydrogen is obtained by passing hydrogen through an electric arc. ii) Hydrogen gas will not reduce heated aluminium oxide. iii) Finely divided palladium absorbs large volume of hydrogen gas. iv) Pure nascent hydrogen is best obtained by reacting ( N a ) with ( C_{2} H_{5} O H ) Which of the above statement(s) is/are correct? A. i only B. ii only c. i, ii and iii D. ii, iii and iv |
11 |
| 531 | AMCORUCULAIRAALVL 1. Assertion : Coal gas is a mixture of methane, hydrogen and carbon monoxide. Reason: It is obtained when coal is burnt in excess of air. |
11 |
| 532 | 119. Zeolite process is used to remove (a) iron (b) hardness (c) zinc (d) pH value |
11 |
| 533 | Treatment with lime remove hardness of water caused by: A. ( C a C l_{2} ) в. ( mathrm{CaSO}_{4} ) c. ( operatorname{Ca}left(H C O_{3}right)_{2} ) D. ( C a C O_{3} ) |
11 |
| 534 | Saline hydrides: A. are dehydrating agents B. are formed by transition metals C . are very poor reducing agents D. are stable towards water and alcohol |
11 |
| 535 | Which reaction shows oxidising nature of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ? ) A. ( A g_{2} O+H_{2} O_{2} rightarrow A g+H_{2} O+O_{2} ) в. ( M n O_{2}+H_{2} O_{2}+H_{2} S O_{4} rightarrow M n S O_{4}+2 H_{2} O+O_{2} ) ( mathbf{c} cdot P b S+4 H_{2} O_{2} rightarrow P b S O_{4}+4 H_{2} O ) D. ( K_{2} C r_{2} O_{7}+H_{2} S O_{4}+4 H_{2} O_{2} rightarrow K_{2} S O_{4}+2 C r O_{5}+ ) ( 5 H_{2} O ) |
11 |
| 536 | Q. 63 Correlate the items listed in Column I with those listed in Column 11. Find out as many correlations as you can. Column Column 11 A. Synthesis gas 1. Na, [Na,(PO3).] B. Dihydrogen 2 Oxidising agent C Heavy water Softening of water D. Calgon 4. Reducing agent E. Hydrogen peroxide Stoichiometric compounds of s-block elements F. Salt like hydrides 6. Prolonged electrolysis of water 7. Zn + NaOH 8. Zn + dil H,SO 9. Synthesis of methanol 10. Mixture of CO and H, |
11 |
| 537 | Assertion When sodium hydride in fused state is electroysed, hydrogen is discharged at anode Reason Sodium hydride is an electroovalent compound in which hydrogen is present as cation A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 538 | ( N a O H+D_{2} O rightarrow N a O D+H D O ), is ( a: ) A. exchange reaction B. deuterolysis reaction. c. hydrolysis reaction D. softening reaction |
11 |
| 539 | Q. 67 Assertion (A) Permanent hardness of water is removed by treatment with washing soda. Reason (R) Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates. (a) Statements A and R both are correct and R is the correct explanation of A (b) A is correct but is not correct (c) A and R both are correct but R is not the correct explanation of A (d) A and R both are false |
11 |
| 540 | y does H ion always get associated with other atoms or molecules? (a) lonisation enthalpy of hydrogen resembles that of alkali metals (b) Its reactivity is similar to halogens (c) It resembles both alkali metals and halogens (d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free on in the |
11 |
| 541 | ( H_{2} O_{2} ) is always stored in black bottles because: A . it is highly unstable B. it has high enthalpy of decomposition c. it undergoes auto oxidation on prolonged standing D. none of the above |
11 |
| 542 | Which of the following option best describe the hydrogen economy? A. Using dihydrogen in an efficient manner B. Dihydrogen is carried and stored in the form of liquid or gas c. Addition of dihydrogen to the reactant D. Both (a) and (b) |
11 |
| 543 | The physical constants which are less for ( D_{2} O ) than ( H_{2} O ) are: A. freezing point and boiling point B. density and viscosity c. solvating ability and dielectric constant D. temperature of maximum density |
11 |
| 544 | Hydrogen molecules are: A. monoatomic and form ( X_{2}^{2-} ) type ions B. diatomic and form ( X_{2}^{-} ) type ions C . diatomic and form ( X^{-} ) as well as ( X^{+} ) type ions D. monoatomic and form ( X^{-} ) type ions |
11 |
| 545 | P arawate) PPL 20. (a) How is dihydrogen prepared from water by using a reducing agent? (b) Give the industrial use of dihydrogen which depends upon heat liberated when it burns, |
11 |
| 546 | The number of moles of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) needed to reduce 1 mole of ( K M n O_{4} ) in acidic medium are: A. 2 moles B. 2.5 moles c. 5 moles D. 3 moles |
11 |
| 547 | ( H_{2} O_{2} ) used in rocket has the concentration: A . ( 50 % ) B. 70% c. ( 30 % ) D. 90% |
11 |
| 548 | Match list I with list II. Choose the correct matching codes from the choices given. List I (Hydride) hydride) A. ( B e H_{2} ) 1. Complex B. ( boldsymbol{A} boldsymbol{s} boldsymbol{H}_{mathbf{3}} ) 2. Lewis acid ( mathbf{C} . boldsymbol{B}_{2} boldsymbol{H}_{mathbf{6}} ) 3. Interstitial D. ( boldsymbol{L} boldsymbol{a} boldsymbol{H}_{mathbf{3}} ) 4. Covalent E. ( boldsymbol{L} boldsymbol{i} boldsymbol{A} boldsymbol{l} boldsymbol{H}_{boldsymbol{4}} ) 5. Intermediate A. A-6, B-2, C-4, D-5, E-1 B. A-6, B-2, C-4, D-3, E-1 c. ( A-6, B-4, C-2, D-3, E-15 ) D. A-5, B-4, C-2, D-3, E-1 |
11 |
| 549 | What do you understand by the term ‘auto-protolysis’ of water? What is its significance? | 11 |
| 550 | The usual valency of hydrogen is: A . -2 B. 0 c. +1 or sometimes -1 D. +2 |
11 |
| 551 | Q14. Name a substance which can oxidise H,Oz. | 11 |
| 552 | Consider the reaction between ( mathrm{Zn} ) and dilute hydrochloric acid forming zinc chloride and liberating hydrogen. |
11 |
| 553 | Which property of water make it easy to contaminate and difficult to purify? A. Water is a universal solvent B. Tendency to dissolve a large number of substances C. Both A and B D. None of the above |
11 |
| 554 | Name the isotope of hydrogen which is radio active. | 11 |
| 555 | Saline water is useful for: A. washing clothes B. drinking c. for agriculture D. None of these |
11 |
| 556 | Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is the most important in this respect? A. Its tendency to lose an electron to form a cation B. It tendency to gain a single electron in its valence shell to attain stable electronic configuration c. Its low negative electron gain enthalpy value D. Its small size |
11 |
| 557 | What is the difference between the terms hydrolysis and hydration? |
11 |
| 558 | In which of the following reaction hydrogen peroxide acts as reducing agent? ( mathbf{A} cdot P b S+4 H_{2} O_{2} rightarrow P b S O_{4}+4 H_{2} O ) B. ( N a_{2} S O_{3}+H_{2} O_{2} rightarrow N a_{2} S O_{4}+H_{2} O ) ( mathbf{c} cdot A g_{2} O(text { moist })+H_{2} O_{2} rightarrow 2 A g+H_{2} O+O_{2} ) D. ( 2 K I+H_{2} O_{2}+H_{2} S O_{4} rightarrow K_{2} S O_{4}+I_{2}+H_{2} O_{2} ) |
11 |
| 559 | Boiling point is least for: ( mathbf{A} cdot H F ) в. ( H C l ) ( mathbf{c} cdot H B r ) D. ( H I ) |
11 |
| 560 | Q10. Complete the following reactions: (1) CO(g) + H,(8) 4, (ii) Zn(s) + NaOH (aq) (iii) C3H2(g) + 3H20(8) Catalyst Treat |
11 |
| 561 | 34. Water gas is the combination of (1) CO and H, (2) Co, and H (3) CO and H, (4) CO, and CO |
11 |
| 562 | When water is cooled it contracts until it reaches and then it starts expanding. A ( cdot 37^{circ} mathrm{C} ) B. ( 40^{circ} mathrm{C} ) ( c cdot 0^{circ} mathrm{C} ) D. ( 4^{circ} mathrm{C} ) |
11 |
| 563 | Both temporary and permanent hardness in water is removed by: A. boiling B. filtration c. distillation D. decantation |
11 |
| 564 | The uses of water are: A. It is used as a universal solvent B. It constitutes a major part of human body C. It is used for controlling climatic conditions D. All of the above |
11 |
| 565 | Statues and painting coated with white lead turn black on long exposure to atmosphere. The original color can be restored by treating them with ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) The reason behind this is? A. blackened statues get coated with ( P b S ) which on reaction with ( H_{2} O_{2} ) is oxidised to while ( P b S O_{4} ) B. ( H_{2} O_{2} ) dissolves the coating of white lead and exposses the inner surface c. White lead reacts with ( H_{2} O_{2} ) to form white ( P b S O_{4} ) D. Blackened statues get coated with lead sulphate which reacts with ( H_{2} O_{2} ) to give ( P b S ). |
11 |
| 566 | A simple method to remove peroxides from ether is to treat them with an aqueous solution of: A. ( K I ) в. КСNS c. ( N a_{2} S_{2} O_{3} ) D. ( B r_{2} ) |
11 |
| 567 | ( 50 mathrm{ml} ) of a certain sample of ( mathrm{H}_{2} mathrm{O}_{2} ) gives ( 1200 mathrm{ml} ) of ( O_{2} ) at STP. The volume strength of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A . 22.4 B. 20 c. 24 v D. 11.2 V |
11 |
| 568 | ( 100 mathrm{kg} ) hard water contains ( 5 mathrm{g} M g S O_{4} ) The hardness of water is: | 11 |
| 569 | Calculate the percentage of deuterium in heavy water. |
11 |
| 570 | The given sample of lathers easily with water, it is : A. hard water. B. soft water. c. permanent hard water. D. temporary hard water. |
11 |
| 571 | ( H_{2} O_{2} ) solution turns blue litmus red If this is true enter 1 , if false enter 0 . |
11 |
| 572 | Change of ( boldsymbol{H} ) into ( boldsymbol{H}^{+} ) is: A. oxidation of hydrogen B. acid base reaction c. reduction of hydrogen D. displacement reaction |
11 |
| 573 | Q4. How can the production of dihydrogen obtained from ‘Coal gasification’ be increased? ATI 11 |
11 |
| 574 | The element symbol for hydrogen is: ( A cdot K ) B. c. не D. Hn |
11 |
| 575 | Which of the following are the essential things required for rusting? A. oxygen B. water c. both D. none of the above |
11 |
| 576 | Boiling point of heavy water is: A ( .3 .82^{circ} mathrm{C} ) B . ( 42^{circ} mathrm{C} ) c. ( 100^{circ} mathrm{C} ) D. ( 101.42^{0} C ) |
11 |
| 577 | When hydrogen reacts with oxygen, oxygen is reduced and water is formed A. True B. False |
11 |
| 578 | Which of the following can be used to prepare hydrogen gas in the laboratory? A. Mercuric oxide B. Acid plus zinç c. Potassium chlorate D. Carbon disulfide E. Benzene |
11 |
| 579 | What are electrons deficient and electron rich compounds of hydrogen? Give examples. |
11 |
| 580 | During electrolysis bonds in ( boldsymbol{H}_{2} boldsymbol{O} ) are broken 18 times faster than ( D_{2} O ) A. True B. False |
11 |
| 581 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A. diamagnetic B. paramagnetic c. ferromagnetic D. none of these |
11 |
| 582 | ( H_{2} O_{2} ) solutions are stored in dark colored plastic or wax-coated glass vessels often with negative catalysts such as urea or sodium stannate added as stabilizers. State whether the given reaction is True or False? |
11 |
| 583 | Hydrogen at the moment of its generation is generally called: A. molecular hydrogen B. nascent hydrogen c. atomic hydrogen D. protium |
11 |
| 584 | The characteristics of hydrogen resemble the elements of ( _{-1-} ) as well A. IIA and VA B. IIIA and VIA c. IIA and VIA D. IA and VIIA |
11 |
| 585 | Two structure of ( H_{2} O_{2} ) are drawn below. Identify the phase ( (X) ) and ( (Y) ) of ( H_{2} O_{2} ) ( mathbf{A} cdot(X) ) is the structure of ( H_{2} O_{2} ) in gas phase and ( (Y) ) in solid phase B. ( (X) ) is structure of ( H_{2} O_{2} ) in solid phase and ( (Y) ) in gas phase c. ( (X) ) and ( (Y) ) are structures of ( H_{2} O_{2} ) in gas phase D. ( (X) ) and ( (Y) ) are structures of ( H_{2} O_{2} ) in solid phase |
11 |
| 586 | Q.58 Why does hard water not form lather with soap? mand |
11 |
| 587 | Assertion (A): Hydrogen shows resemblance with alkali metals as well as halogens. Reason (R): Hydrogen exists in atomic form only at high temperature. A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not a correct explanation of c. ( A ) is true but ( R ) is false D. A is false but R is true |
11 |
| 588 | Dalda (Vanaspathi) is prepared by: A. hydrogenation of triolien B. hydrogenation of soap c. hydrogenation of tristearine D. electrolysis of potassium acetate |
11 |
| 589 | When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is A . 1: 1 B. 1: 2 c. 2: 1 D. 9: 4 |
11 |
| 590 | Assertion Hydrogen peroxide acts only as oxidising agent. ( left(boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{O}right) ) Reason All peroxides behave as the oxidising agent only. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 591 | Which element forms hydride? A ( . C r ) в. ( M o ) c. ( W ) D. ( S g ) |
11 |
| 592 | Which is the accepted structure of ( H_{2} O_{2} ) in gas phase? ( A ) в. c. both D. none |
11 |
| 593 | Which of the following statements is/are true? This question has multiple correct options A. Tritium is the isotope of hydrogen with 1 neutron B. Deuterium is more reactive than hydrogen C ( cdot D_{2} O ) concentration in water is higher than ( T_{2} O ) D. Boiling point of hydrogen is lower than that of deuterium |
11 |
| 594 | Assertion Hydrogen is highly inflammable. Reason It burns with popping sound. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 595 | Bleaching action of chlorine occurs in the presence of : A. oxygen B. moisture c. dry air D. sunlight |
11 |
| 596 | In the Merck’s process, the reagents involved in the preparation of hydrogen peroxide are: A. ( B a O_{2}, H C l ) в. ( N a_{2} O_{2}, H_{2} S O_{4} ) с. Ва Од( _{2}, )На( _{2} )СО( _{3} ) D. ( P b O_{2}, H_{2} O ) |
11 |
| 597 | Which one of the following reactions does not form gaseous product? A. ( P b O_{2}+H_{2} O_{2} rightarrow ) в. ( N a_{2} C O_{3}+H_{2} O_{2} rightarrow ) ( mathbf{c} cdot P b S+H_{2} O_{2} rightarrow ) D. ( C l_{2}+H_{2} O_{2} rightarrow ) |
11 |
| 598 | Q24. Write chemical reaction to show the amphoteric nature of water. | 11 |
| 599 | The substance used as a moderator in atomic reactors is: A. boron B. cadmium c. uranium -235 D. heavy water |
11 |
| 600 | Select the correct statement about water (a) water can exist in all the three forms of matter. (b) the b.p. of water is 100°C (c) water can not be compressed (d) all the above are correct. |
11 |
| 601 | The brownish-white deposit on kettles, heating elements and utensils formed by boiling water is due to: A. moisture in the air B. temporary hardness of water c. permanent hardness of water D. reaction of sulphur dioxide in the air with hot water |
11 |
| 602 | Nascent hydrogen is obtained from reaction between : A. ( N a ) and ( C_{2} H_{5} O H ) B. ( A l ) and ( N a O H ) c. ( Z n ) and ( d i l . H_{2} S O_{4} ) D. All of these |
11 |
| 603 | Which property of hydrogen is shown by the following reactions? ( boldsymbol{F} boldsymbol{e}_{3} boldsymbol{O}_{4}+boldsymbol{4} boldsymbol{H}_{2} rightarrow boldsymbol{3} boldsymbol{F} boldsymbol{e}+boldsymbol{H}_{2} boldsymbol{O} ) ( boldsymbol{C O}+boldsymbol{H}_{2} frac{boldsymbol{C r}_{2} boldsymbol{O}_{3}}{boldsymbol{Z n O}_{3}} boldsymbol{C H}_{3} boldsymbol{O H} ) A. Reducing character B. Oxidizing character c. combustibility D. High reactivity |
11 |
| 604 | Heavy water is used in nuclear reactors as: A. source of ( alpha- ) particles B. slowing down the speed of high energy neutrons C. transporting heat of the reactor D. heating purpose |
11 |
| 605 | Why is aluminium metal not used in the lab preparation of hydrogen? |
11 |
| 606 | Q. 24 Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of (a) chlorides of Ca and Mg in water (b) sulphates of Ca and Mg in water (c) hydrogen carbonates of Ca and Mg in water (d) carbonates of alkali metals in water |
11 |
| 607 | Temporary hardness is caused due to the presence of: A. magnesium sulphate B. magnesium chloride c. calcium sulphate D. magnesium carbonate |
11 |
| 608 | Hydrogen is a non-metal having electron in the valence shell. ( A ) B. 2 ( c cdot 3 ) D. 4 |
11 |
| 609 | Which of the following is not true about ( H_{2} O ) molecule? A. The molecule has ( mu=0 ) B. The molecule can act as a base c. Shows abnormally high boiling point in comparison to hydrogen oxygen group D. The molecule has a bent shape |
11 |
| 610 | Which is the lightest gas? A. ( N_{2} ) в. не ( c cdot O_{2} ) D. ( H_{2} ) |
11 |
| 611 | How does ( H_{2} O_{2} ) behave as a bleaching agent? |
11 |
| 612 | Which of the following is NOT soluble in water? A. Salt B. Sugar c. oxygen D. sand |
11 |
| 613 | Choose the correct statement about the industrial preparation of hydrogen from water gas ( left(C O+H_{2}right) ) ( mathbf{A} cdot H_{2} ) is removed through occlussion with ( P d ) B. ( C O ) and ( H_{2} ) are fractionally separated using differences in their densities C. ( C O ) is removed by absorption in ( a q . C u_{2} C l_{2} ) solution D. ( C O ) is oxidised to ( C O_{2} ) with steam in the presence of a catalyst followed by absorption of ( C O_{2} ) in alkali |
11 |
| 614 | ( D_{2} O ) is used more in: A. chemical industry B. nuclear moderator c. pharmaceutical preparation D. insecticide preparations |
11 |
| 615 | Hydrogen does not combine with ( A cdot S b ) B. Na c. не D. zn |
11 |
| 616 | Atomic hydrogen is used as: A. rocket propolent B. liquid fule C. fire extinguisher D. none of these |
11 |
| 617 | The formula for permutit or zeolite which is used as softer in ion-exchange method is: A. ( N a A l S i O_{4} ) B. ( N a A l O_{2} ) c. both ( A ) and ( B ) D. ( N a_{2} S O_{4} ) |
11 |
| 618 | What willl be the mass of oxygen liberated by decomposition of ( 200 mathrm{mL} ) hydrogen peroxide solution with a strength of 34 g per litre? A. 25.5g B. 3.0g c. ( 3.2 g ) D. 4.28 |
11 |
| 619 | ( H_{2} O_{2} ) is always stored in black bottles because: A . It is highly unstable B. Its enthalpy of decomposition is highh c. It undergoes autooxidation on prolonged standing D. None of these |
11 |
| 620 | Vacuum distillation is conducted to concentrate ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) solution A. True B. False |
11 |
| 621 | element has one electron in its outermost shell and attains duplet configuration after one more electron and attains stability. A. Hydrogen B. Fluorine c. Helium D. Berrylium |
11 |
| 622 | Sulphur trioxide is dissolved in heavy water to form a compound ( X ). The state of hybridisation of sulphur in ( boldsymbol{X} ) is: ( A cdot s p^{2} ) B ( cdot s p^{3} ) ( c cdot s p ) D. ( d s p^{2} ) |
11 |
| 623 | Which is true statement about ( D_{2} O ) and ( boldsymbol{H}_{2} boldsymbol{O} ? ) A ( cdot D_{2} O ) has lower dielectric constant than ( H_{2} O ) B. ( N a C l ) is more soluble in ( D_{2} O ) than ( H_{2} O ) c. Both are correct D. None of these |
11 |
| 624 | During decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2}, ) it undergoes: A. oxidation B. reduction c. redox reaction D. disproportionation |
11 |
| 625 | Describe the structure of the common form of ice. |
11 |
| 626 | Ordinary hydrogen at room temperature is a mixture of ( mathbf{A} cdot 75 % o-mathrm{Hydrogen}+25 % p ) -Hydrogen B. ( 25 % ) o-Hydrogen ( +75 % ) p-Hydrogen ( mathbf{c} .50 % o ) -Hydrogen ( +50 % p ) -Hydrogen D. ( 1 % ) o-Hydrogen ( +99 % ) p-Hydrogen |
11 |
| 627 | The volume of ( 20 V-H_{2} O_{2} ) solution required to prepare 5 litres of oxygen at STP is: A . ( 125 mathrm{ml} ) B. 250 m1 c. ( 100 mathrm{ml} ) D. ( 50 mathrm{m} ) |
11 |
| 628 | Out of the following metals, which will give ( H_{2} ) on reaction with ( N a O H ? ) ( boldsymbol{I}: boldsymbol{Z} boldsymbol{n} ) ( boldsymbol{I} boldsymbol{I}: boldsymbol{M} boldsymbol{g} ) ( boldsymbol{I I I}: boldsymbol{A l} ) ( boldsymbol{I} boldsymbol{V}: boldsymbol{B} boldsymbol{e} ) A. ( I, I I, I I I, I V ) в. ( I, I I I, I V ) c. ( I I, I V ) D. ( I, I I I ) |
11 |
| 629 | 2.68 Assertion (A) Some metals like platinum and palladium, can be used as storage media for hydrogen. Reason (R) Platinum and palladium can absorb large volumes of hydrogen. (a) Statements A and R both are correct and R is the correct explanation of A (b) A is correct but R is not correct (c) A and R both are correct but R is not the correct explanation of A (d) A and R both are false |
11 |
| 630 | Permanent hardness of water is due to the presence of the chlorides and sulphates of Ca, Mg and Fe. If this is true enter 1 , if false enter 0 . |
11 |
| 631 | Explain the laboratory method for preparation of hydrogen peroxide. | 11 |
| 632 | toppr Q Type your question ( boldsymbol{H}_{2} boldsymbol{O}_{2(l)} rightarrow boldsymbol{H}_{2} boldsymbol{O}_{(l)}+frac{1}{2} boldsymbol{O}_{2(g)}: boldsymbol{Delta}_{r} boldsymbol{G}^{o}= ) ( -122.6 k J / m o l ) As the reaction from left to right is accompanied by a decrease in free energy, it is a spontaneous process. However, its decomposition at ( 25^{circ} mathrm{C} ) in the absence of catalysts is slow. The catalysts which accelerate decomposition are ( mathrm{Pt}, mathrm{Ag}, ) cobalt, iron, copper, manganese dioxide and light. Concentrated ( H_{2} O_{2} ) solution can result into uncontrolled decompositions leading to explosion. ( H_{2} O_{2} ) thus stored in colored wax-lined bottles (as rough glass surfaces) also causes its decomposition. A few stabilizers such as acids acetanilide, pyrophosphates, and stannates are added to slow down the decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) Here ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is a: A. diamagnetic c. non-polar D. all are incorrect |
11 |
| 633 | The nuclei of tritium ( left(H^{3}right) ) atom would contain neutrons equal to: ( mathbf{A} cdot mathbf{1} ) B . 2 ( c .3 ) D. 4 |
11 |
| 634 | ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{O}_{3} rightarrow boldsymbol{H}_{2} boldsymbol{O}+mathbf{2} boldsymbol{O}_{2}, ) in this reaction ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) acts as: A. oxidising agent B. reducing agent c. dehydrating agent D. bleaching agent |
11 |
| 635 | From the above setup answer the following: Why could you not use this setup for preparing ( H_{2} ) if the generator contained ( Z n^{+} ) vinegar? A. Hydrogen would not be produced B. The setup of the generator is improper C. The generator must be heated with a burner D. The delivery tube setup is wrong E. The gas cannot be collected over water |
11 |
| 636 | Q9. What is perhydrol? | 11 |
| 637 | Statement I : Deuterium and hydrogen are different elements. Statement II: They have the different numbers of protons in each |
11 |
| 638 | Deuterium occurs in trace amounts naturally as deuterium gas represented as: ( A cdot D_{2} ) в. ( ^{2} H_{2} ) c. both A and B D. ( ^{2} D ) |
11 |
| 639 | The co-ordination number of ( N a ) in solid ( N a H ) is: A .4 B. 6 ( c cdot 8 ) D. 12 |
11 |
| 640 | In a permutit, the calcium and magnesium ions of hard water are exchanged by: A ( cdot C O_{3}^{2-} ) and ( H C O_{3}- ) ions of permutit B. ( N a^{+} ) ions of permutit c. ( A l^{3+} ) ions of permutit D. ( S i^{4+} ) ions of permutiti |
11 |
| 641 | D uryuu PEIUNUL2027 Q. 65 Match the terms in Column I with the relevant item in Column II. Column 1 Column 11 A Electrolysis of water produces 1. atomic reactor B. Lithium aluminium hydride is 2. polar molecule used as C Hydrogen chloride is a 3. recombines on metal surface to generate high temperature D. Heavy water is used in 4. reducing agent E. Atomic hydrogen 5. hydrogen and oxygen |
11 |
| 642 | Which one of the following is not a physical property of water? A. Water has low specific heat capacity B. It expands on cooling c. It is odorless and tasteless D. The boiling point of water is ( 100^{circ} mathrm{C} ) |
11 |
| 643 | 118. Lime-soda process is used to remove (from water) (a) odour and taste (b) iron and manganese (c) permanent hardness (d) temporary hardness |
11 |
| 644 | Discuss the principle and method of softening of hard water by synthetic ion exchange resins. | 11 |
| 645 | Do you expect different products in solution when aluminium(III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified the water, and (iii) alkaline water? Write equations wherever necessary. |
11 |
| 646 | Why ice is lighter than water? | 11 |
| 647 | The ( % ) by weight of hydrogen in ( H_{2} O_{2} ) is : A . 50 B . 25 c. 6.25 D. 5.88 |
11 |
| 648 | Deuterio hydrate of magnesium sulphate contains how many molecules of heavy water? ( A cdot 2 D_{2} O ) B. ( 3 D_{2} ) O ( mathrm{c} cdot 10 mathrm{D}_{2} mathrm{O} ) D. ( 7 D_{2} O ) |
11 |
| 649 | Write the uses of dihydrogen gas: | 11 |
| 650 | Hydrogen does not resemble alkali metals in which one of the following properties? A. Tendency to form cation B. Nature of oxide c. combination with halogens D. Reducing character |
11 |
| 651 | Density of heavy water is maximum at: ( mathbf{A} cdot 3.82^{circ} C ) B . ( 101.42^{circ} mathrm{C} ) c. ( 11.6^{circ} mathrm{C} ) D. ( 4^{circ} mathrm{C} ) |
11 |
| 652 | The reaction between which of the following reactants produces hydrogen? ( mathbf{A} cdot Z n+H C I ) B ( . B a O_{2}+H C I ) ( mathbf{c} cdot K_{2} S_{2} O_{8}+H_{2} O ) D. ( N a_{2} O_{2}+H C I ) |
11 |
| 653 | When ( K_{2} C r_{2} O_{7} ) is treated with ( H_{2} O_{2} ) then: This question has multiple correct options A. in strong acidic medium deep blue-violet complex ( C r Oleft(O_{2}right)_{2} ) is formed B. in less acidic medium violet, coloured complex ( left[mathrm{CrO}left(mathrm{O}_{2}right)(mathrm{OH})right]^{-} ) is formed C . in alkaline medium ( left[mathrm{Cr}left(mathrm{O}_{2}right)_{4}right]^{3-} ) is formed D. in ammonical solution ( left(N H_{3}right)_{3} C r O_{4} ) dark red-brown compound is formed. |
11 |
| 654 | Q33. What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water. TY |
11 |
| 655 | Which one among the following reactants produces hydrogen? ( mathbf{A} cdot Z n+H C I ) в. ( B a O_{2}+H C I ) c. ( K_{2} S_{2} O_{8}+H_{2} O ) D. ( N a_{2} O_{2}+H C I ) |
11 |
| 656 | ( N a_{2} C O_{3} ) is widely used in softening of hard water. If 1 L of hard water required ( 0.0106 g ) of ( N a_{2} C O_{3}, ) The hardness in ppm (parts per million i.e., ( 10^{6} ) ml) of ( boldsymbol{C a} boldsymbol{C O}_{3} ) is: A. 0.01 ppm ( C a C O_{3} ) B. 0.10 ppm ( C a C O_{3} ) c. 1.00 ppm ( C a C O_{3} ) D. ( 10.00 mathrm{ppm} mathrm{CaCO}_{3} ) |
11 |
| 657 | Hydrogen loses its electron to form ( boldsymbol{H}^{+} ) In this respect, it resembles: A. halogens B. alkali metalss c. transition element D. alkaline earth metals |
11 |
| 658 | NaH is an example of : A. Electron-rich hydride B. Molecular hydride C . Saline hydride D. Metallic hydride |
11 |
| 659 | When zinc react with dilute sulphuric acid hydrogen is produced in: A. molecular form B. combined form c. nascent form D. hydrogen will not form |
11 |
| 660 | 2.53 With the help of suitable examples, explain the property of H20, that is responsible for its bleaching action? O biobit liberoton |
11 |
| 661 | 29. The density of water is greater than the density of kerosene. If the two are mixed : (1) Kerosene dissolves in water (2) They mix uniformly (3) Water floats on kerosene (4) Kerosene floats on water |
11 |
| 662 | Hydrogen resembles IV-A elements in what respect? A. All are metals. B. All are non metals. c. All are metalloid. D. They have half-filled electronic configuration |
11 |
| 663 | Water is a A. acidic B. neutral c. basic D. amphoteric |
11 |
| 664 | When a substance A reacts with water, it produces a combustible gas ( mathrm{B} ) and a solution of substance ( C ) in water. D reacts with this solution of ( mathrm{C} ) and produces the same gas B on warming. D can also produce gas ( mathrm{B} ) on reaction with dilute ( H_{2} S O_{4} . ) A imparts a deep golden yellow colour to smokeless flame. ( A, B, C ) and ( D ) respectively are: ( mathbf{A} cdot N a, H_{2}, N a O H, Z n ) B . ( K, H_{2}, K O H, A l ) ( mathbf{c} cdot_{C a}, H_{2}, C a(O H)_{2}, S n ) D ( cdot operatorname{caC}_{2}, C_{2} H_{2}, C a(O H)_{2}, F e ) |
11 |
| 665 | Pure water is neutral to litmus. A. True B. False |
11 |
| 666 | 73 (1) What mass of hydrogen peroxide will be present in 2 L of a solution? (ii) Calculate the mass of oxygen which will be liberated by the decomposition of 200 mL of this solution. |
11 |
| 667 | Zinc react with aqueous sodium hydroxide to form dihydrogen and A. zinc oxide B. sodium zincate c. zinc hydroxide D. sodium precipitate |
11 |
| 668 | All of the following are isotopes of hydrogen except: A. tritium B. hydronium c. protium D. deuterium |
11 |
| 669 | 42. Water is an excellent solvent be- cause its molecules are : (1) Light weight (2) Neutral (3) Highly polar (4) Non-polar |
11 |
| 670 | What do you understand by the term non-stoichiometric hydrides? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer |
11 |
| 671 | Describe the bonding in ( boldsymbol{H}_{2} ? ) A. s-s bonds B. s-p bonds c. p-p bonds D. ( s p^{3}-p ) bonds E ( cdot s p^{2}-s p^{2} ) bonds |
11 |
| 672 | Q3. What is zeolite? | 11 |
| 673 | Bentonite, a clay of alumina-silica, is dropped from aeroplanes in the form of a slurry with water for the purpose of: A. cooling the soil B. fertilizing the soil c. fumigation of plants D. spreading water over fires |
11 |
| 674 | Assertion A ( 30 % ) solution of ( H_{2} O_{2} ) is marketed as 100 volume’ hydrogen peroxide. Reason 1 L of ( 30 % ) H ( _{2} ) O ( _{2} ) will give 100 mL of oxygen at STP. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
| 675 | yurogen catches wifes. Q9. Calculate the volume strength of a 3% solution of H202 |
11 |
| 676 | Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful? |
11 |
| 677 | Crystals of ( 100 % H_{2} O_{2} ) is obtained treating ( 90 % quad H_{2} O_{2} ) with: A . solid ( C O_{2} ) and ether B. dil. ( H_{2} S O_{4} ) c. quick lime D. ( N a O H+C a O ) |
11 |
| 678 | Hydrogen resembles alkali metals in many respect for which several factors are responsible. Of the following factors which one is the most important in this respect? A. Its tendency to lose electron B. Its tendency to gain electron in its valence shell c. It has high ionisation enthalpy. D. ts small size |
11 |
| 679 | State True or False. Free hydrogen is found naturally on earth. A. True B. False |
11 |
| 680 | Observe the following statements: 1. Heavy water is harmful to the growth of animals. 2. Heavy water reacts with ( A l_{4} C l_{3} ) and forms deuterated acetylene. 3. ( B a C l_{2} .2 D_{2} O ) is an example of interstitial deuterate The correct statements are: A. 1 and 3 B. 1 and 2 c. 1,2 and 3 D. 2 and 3 |
11 |
| 681 | Pure water is a of electricity. A. good B. badd c. either could be possible D. none of the above |
11 |
| 682 | The species that contain peroxide ions is/are: This question has multiple correct options A. ( K O_{2} ) в. ( operatorname{Sr} O_{2} ) ( mathbf{c} cdot B a O_{2} ) D. ( N a_{2} O_{2} ) |
11 |
| 683 | How do you expect the metallic hydrides to be useful for hydrogen storage? Explain. | 11 |
| 684 | Consider an aqueous solution, ( 0.1 mathrm{M} ) each in ( H O C N, H C O O H,(C O O H)_{2} ) and ( H_{3} P O_{4}, ) for ( H O C N, ) we can write ( boldsymbol{K}_{boldsymbol{a}}(boldsymbol{H} boldsymbol{O C N})=frac{left[boldsymbol{H}^{+}right]left[boldsymbol{O C N}^{-}right]}{[boldsymbol{H O C N}]} cdotleft[boldsymbol{H}^{+}right] ) in this expression refers to: A ( . H^{+} ) ions released by ( H O C N ) B. sum of ( H^{+} ) ions released by all monoprotic acids C. sum of ( H^{+} ) ions released only the first dissociation of all the acids D. overall ( H^{+} ) ion concentration in the solution |
11 |
| 685 | Which of the following hydrides is electron deficient? ( mathbf{A} cdot N a H ) в. ( C a H_{2} ) ( mathrm{c} cdot mathrm{CH}_{4} ) D. ( B_{2} H_{6} ) |
11 |
| 686 | Which of the following are correctly matched? (a) ( D_{2} O- ) Hard water (b) ( H_{2} O- ) Heavy water ( (c) D- ) Heavy hydrogen ( (d) B a O_{2} cdot 8 H_{2} O- ) True peroxide ( mathbf{A} cdot a, b, c, d ) are correct B. ( c, d ) are correct c. ( a, b, c ) are correct D. ( a, c, d ) are correct |
11 |
| 687 | Find the correct statement from the given one: A. deuterium can replace the normal hydrogen in water molecules to form heavy water B. deuterium can not replace the normal hydrogen in water molecules to form heavy water C. hydrogen can replace deuterium in water molecules to form water D. none of these |
11 |
| 688 | Q35. How does H,O, behave as a bleaching agent? | 11 |
| 689 | Industrially, ( H_{2} O_{2} ) is prepared by the auto-oxidation of 2-alkylanthraquinols. A. True B. False |
11 |
| 690 | Which of the following terms is not correct for hydrogen? A. Its molecule is diatomic B. It exists both as ( H^{+} ) and ( H^{-} ) in different chemical compounds C. It is the only species which has no neutrons in the nucleus D. Heavy water is unstable because hydrogen is substituted by its isotope deuterium |
11 |
| 691 | Compare the structures of ( H_{2} O ) and ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) |
11 |
| 692 | Q27. Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful? |
11 |
| 693 | It is a common experience that after a rainfall, the objects at a distance are seen more clearly. Why? | 11 |
| 694 | supports combustion. A. Sodium bicarbonate B. Hydrogen c. Carbon dioxide D. None of these |
11 |
| 695 | Explain why ( H_{2} ) and ( O_{2} ) do not react at room temperature |
11 |
| 696 | When water is boiled to ( 100^{circ} mathrm{C} ), it converts into steam which on condensation gives back water. Here, the heat given out is called latent heat of condensation which is equal to the latent heat of vapourisation. A. True B. False |
11 |
| 697 | What is formed when calcium carbide reacts with heavy water? A. ( C_{2} D_{2} ) в. ( C a D_{2} ) ( mathbf{c} cdot C a_{2} D_{2} O ) D. ( C D_{2} ) |
11 |
| 698 | Which is NOT a commercial method for preparation of Dihydrogen? A. Lane’s Process B. Thermal cracking of natural gas c. Reacting metals with dilute mineral acids D. syngas-Bosch Process |
11 |
| 699 | When ( H_{2} O_{2} ) is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand: A. a blue colour is obtained in ether because of formation of ( C r O_{5} ) B. a blue colour is obtained in ether because of formation of ( mathrm{CrO}_{3} ) c. a blue colour is obtained in ether because of formation ( operatorname{of} C r_{2}left(S O_{4}right)_{3} ) D. chromyl chloride is formed |
11 |
| 700 | Q. 15 Which of the following ions will cause hardness in water sample? (b) Na (c) CI (d) K+ (a) Ca ²+ Anal Diarba |
11 |
| 701 | The metal which gives hydrogen on treatment with hydrochloric acid as wel as sodium hydroxide is: A. ( F e ) в. ( Z ) и c. ( C u ) D. All of the above |
11 |
| 702 | Ratio of the Bohr radius of protium, deuterium and tritium atoms is: A .1: 2: 3 B. 1: 1: 1 c. 3: 2: 1 D. 2: 3: 4 |
11 |
| 703 | The fuel used to produce electrical energy in the space rocket Saturn ( mathrm{V} ) used by Neil Armstrong to reach the moon was: A. ( C O+O_{2} ) в. ( F_{2}+O_{2} ) c. ( C H_{4}+O_{2} ) D. liquid ( H_{2}+O_{2} ) |
11 |
| 704 | Statement 1: Hydrogen peroxide, ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is a good oxidizing agent.
Statement 2: The hydrogen in ( H_{2} O_{2} ) has |
11 |
| 705 | Q14. Among NH, H,O and HF, which would you expect to have highest magnitude of hydrogen bonding and why? itude hidrogen bonding since is most A TIC |
11 |
| 706 | The isotope of hydrogen, ( D_{2} ) forms heavy water, ( D_{2} O . ) It is qualified as ( D_{2} O ) because it is: A. a heavy liquid B. an oxide of heavier isotope of oxygen c. an oxide of deuterium D. denser than water |
11 |
| 707 | During the formation of hydronium ion, water molecule acts as acceptor. Enter 1 if the statement is True, else 0 |
11 |
| 708 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{2} boldsymbol{H}^{+}+boldsymbol{O}_{2}+boldsymbol{2} boldsymbol{e}^{-} ) The above equation represent which of the following behaviour of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ? ) A. Reducing B. Oxidising c. Basic D. Catalytic |
11 |
| 709 | Q1. Account for the following: (a) Can phosphorus with electronic configuration 3s 3p form PH;? (b) Water is responsible for moderation of body temperature. How? (c) Hard water is not suitable for boilers as well as for laundary. |
11 |
| 710 | The reagent commonly used to determine hardness of water titrimetrically is: A. Oxalic acid B. Disodium salt ot EDTA c. Sodium citrate D. Sodium thiosulphate |
11 |
| 711 | Among the other elements present in the earth’s crust, hydrogen stands in which position in abundance by mass? A. Fourth B. Sixth c. Eighth D. Ninth |
11 |
| 712 | Ionic hydrides are formed by: A. transition metals B. elements of very high electropositivity C . elements of very low electropositivity D. metalloids |
11 |
| 713 | Q10. What is meant by hard water? | 11 |
| 714 | Comment on the dual position of hydrogen in the periodic table | 11 |
| 715 | Acidified solution of ( K_{2} C r_{2} O_{7} ) on treatment with ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) yields: A. ( C r O_{3}+H_{2} O+O_{2} ) в. ( C r_{2} O_{2}+H_{2} O+O_{2} ) ( mathrm{c} cdot mathrm{Cr} mathrm{O}_{5}+mathrm{H}_{2} mathrm{O}+mathrm{K}_{2} mathrm{SO}_{4} ) D. ( H_{2} C r_{2} O_{7}+H_{2} O+O_{2} ) |
11 |
| 716 | Q. 47 Hydrogen generally forms covalent compounds. Give reason. Ane Hydrogen h |
11 |
| 717 | The reagent commonly used to determine hardness of water titrimetrically is: A . oxalic acid B. sodium citrate c. disodium salt of EDTA D. sodium carbonate |
11 |
| 718 | Ni Q.14 Which of the following reactions is an example of use of water gas in the synthesis of other compounds? (a) CH4(g) + H,O(g) – 1270 K CO(g) + H2(g) (b) CO(g) + H2O(g) – 673 K CO, g) + Hg) (c) CnH2n+ 2 + nH,O(g) 1270 K nco + (2n + 1)H, (d) CO(g) + 2H2(g) Cobalt CH,OH(L) 673 K Catalyst Ni Catalyst |
11 |
| 719 | The high boiling point of water is due to: A . its high specific heat B. hydrogen bonding c. high dielectric constant D. low dissociation constant |
11 |
| 720 | ( frac{n}{p} ) ratio of ( _{1} H^{1} ) is ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 3 ) D. |
11 |
| 721 | Hydrogen is not found free in the nature because hydrogen is a/an: A. reactive element B. non-reactive element c. electropositive element D. none of the above |
11 |
| 722 | The ( p H ) of water is: ( A cdot 9 ) B. 3 ( c cdot 7 ) D. 4 |
11 |
| 723 | Permanent hardness is due to the presence of soluble salts of Mg and Ca in the form of chlorides and sulphates in ( H_{2} O . ) It can be removed by: A. boiling B. the Clark’s method c. treatment with ( N a_{2} C O_{3} ) D. all of these |
11 |
| 724 | The formula of pertitanic acid is: A ( . H_{2} T i O_{5} ) в. ( H_{2} T i O_{2} ) ( mathrm{c} . H_{2} T i O_{4} ) D. ( H_{2} T i O_{3} ) |
11 |
| 725 | What is the product of electrolysis of 45 grams of water? A. 40 grams of ( H_{2} ) and 45 grams of ( O_{2} ) B. 40 grams of ( O_{2} ) and 5 grams of ( H_{2} ) c. 30 grams of ( H_{2} ) and 15 grams ( O_{2} ) D. 30 grams of ( O_{2} ) and 15 grams of ( H_{2} ) |
11 |
| 726 | Hydrogen and Deuterium can be separated by gas diffusion principle. If this is true enter 1 , if false enter 0 . |
11 |
| 727 | Match list I with list II and select the correct answer using the codes given below the lists. List – I List- 1 1. Heavy water 2. Temporary hard water ( A ) Bicarbonates of ( M g ) and ( C a ) in water B. No foreign ions in water 3. Softwater permanent hard water ( A cdot 1-C, 2-D, 3-B, 4-A ) B. ( 1- ) B, ( 2-A, 3-C, 4-D ) ( c cdot 1-B, 2-D, 3-C, 4-A ) D. ( 1-C, 2-A, 3-B, 4-C ) |
11 |
| 728 | Decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is retarded by A . Acetanilide в. ( M n O_{2} ) c. zinc D. finely divided metal |
11 |
| 729 | What is the gas liberated when alkaline formaldehyde solution is reacted with hydrogen peroxide in the presence of pyrogallol? A ( . H_{2} ) в. ( O_{2} ) ( mathrm{c} cdot mathrm{CH}_{4} ) D. ( C O_{2} ) |
11 |
| 730 | Which property among the following is same for both hydrogen and deuterium molecules? A. Bond energy B. Melting point c. Boiling point D. Bond length |
11 |
| 731 | If transfer of ( boldsymbol{H}_{2} ) gas occurs from north pole to desert area, which form of hydrogen is stable? Desert A. Ortho B. Para ( c . ) Both D. None |
11 |
| 732 | (I) ( quad mathrm{H}_{2} mathrm{O}_{2}+mathrm{O}_{3} rightarrow mathrm{H}_{2} mathrm{O}+2 mathrm{O}_{2} ) (II) ( mathrm{H}_{2} mathrm{O}_{2}+mathrm{Ag}_{2} mathrm{O} rightarrow 2 mathrm{Ag}+mathrm{H}_{2} mathrm{O}+mathrm{O} ) Role of hydrogen peroxide in the above reactions is: A. oxidizing agent in (I) and reducing agent in (II) B. reducing agent in (I) and oxidizing agent in (II) c. reducing agent in both (I) and (II) D. oxidizing agent in both (I) and (II) |
11 |
| 733 | When hydrogen burns in oxygen, water is formed and when water is electrolysed then hydrogen and oxygen are produced. What type of a reaction takes place (i) in the first case, (ii) in the second case? A. In both the cases, i.e. (i) and (ii), a combination reaction takes place B. In the first case, a combination reaction takes place and in the second case, a decomposition reaction takes place. c. In the first case, a combination reaction rakes place and in the second case, a displacement reaction takes place. D. In the first case, a displacement reaction takes place and in the second case, a decomposition reaction takes place. |
11 |
| 734 | The metal that gives hydrogen gas upon treatment with both acid as well as base is : A. zinç B. iron c. magnesium D. mercury |
11 |
| 735 | Q2. Account for the following: (a) While H,O, can act as oxidising as well as reducing agent in their reactions, Oand HNO3 acts as oxidants only. (b) When conc. H.So, is added to an inorganic mixture containing chloride, HCl is produced but if a mixture contains bromide, then we get red vapours of bromine. |
11 |
| 736 | (a) ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{O}_{3} rightarrow boldsymbol{H}_{2} boldsymbol{O}+mathbf{2} boldsymbol{O}_{2} ) (b) ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{A} boldsymbol{g}_{2} boldsymbol{O} rightarrow boldsymbol{2} boldsymbol{A} boldsymbol{g}+boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{O}_{2} ) Role of hydrogen peroxide in the above reactions is respectively: A. Oxidizing in (a) and reducing in (b) B. Reducing in (a) and oxidizing in (b) c. Reducing in (a) and (b) D. Oxidizing in (a) and (b) |
11 |
| 737 | Which of the following metals directly combine with hydrogen gas to give a hydride? A . Au B. Ni ( c cdot c a ) D. cu |
11 |
| 738 | Identify the substance that is not a water softener. A . ( N a O H ) в. ( N a_{2} C O_{3} ) c. ( N a_{2} A l_{2} S i_{2} O_{8} ) D. ( M g C l_{2} ) |
11 |
| 739 | 19. Which of the following reaction produces hydrogen? (a) H.S.O+,0 (b) BaO + HCI (c) Mg + H2O (d) Na O2 + 2HCI |
11 |
| 740 | Q9. What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reaction? 09. Mai – |
11 |
| 741 | Q7. Discuss the consequences of high enthalpy of H-H bond in terms of chemical reactivity of dihydrogen. |
11 |
| 742 | A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard. A. Sodium chloride, Potassium chloride B. Sodium sulphate, Potassium sulphate c. sodium sulphate, Calcium sulphate D. Calcium sulphate, Calcium chloride |
11 |
| 743 | Acidified solution of chromic acid on treatment with ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) yield: ( A cdot C r O_{3}+H_{2} O+O_{2} ) в. ( C r_{2} O_{3}+H_{2} O+O_{2} ) ( mathrm{c} cdot mathrm{Cr} mathrm{O}_{5}+mathrm{H}_{2} mathrm{O} ) D. ( H_{2} C r_{2} O_{7}+H_{2} O+O_{2} ) |
11 |
| 744 | Why iron is not used in the lab preparation of hydrogen? |
11 |
| 745 | Hydrogen is not more reactive at ordinary temperature, because at ordinary temperature it is in its: A . gaseous state B. liquid state c. molecular state D. atomic state |
11 |
| 746 | How does dihydrogen reacts with halogens like (i) Chlorine and (ii) Fluorine? |
11 |
| 747 | The by-product formed in most of the cases with the use of hydrogen is: A. water B. oxygen c. carbon-dioxide D. none of above |
11 |
| 748 | ( boldsymbol{H}^{+}, boldsymbol{D}^{+} ) and ( boldsymbol{T}^{+} ) differ in all except in: A. number of electrons B. number of neutrons c. ionic mass D. all are correct |
11 |
| 749 | Is ( C O_{2} ) is more solution in water than ( O_{2} ? ) A. Yes B. No c. Ambiguous D. Data insufficient |
11 |
| 750 | When ( H_{2} O_{2} ) reacts with chlorine, the product obtained is: ( A cdot O_{2} ) в. ( H_{2} ) c. ( C l O_{2} ) D. НОС l |
11 |
| 751 | ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: A. oxidising agent B. both oxidising and reducing agent C . reducing agent D. none of the above |
11 |
| 752 | The oxidation number of hydrogen varies from: ( A cdot-1+0+1 ) B. 0 to +1 ( c cdot-1 ) to 0 ( D cdot 0 ) to +2 |
11 |
| 753 | Heavy water is obtained by? A. boiling water B. heatiing ( H_{2} O_{2} ) C. Prolonged electrolysis of ( H_{2} O ) D. All of these |
11 |
| 754 | Which of the following represents the chemical equation involved in the preparation of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) from barium peroxide? A ( cdot B a O_{2} cdot 8 H_{2} O+H_{2} S O_{4} rightarrow B a S O_{4}+H_{2} O_{2}+8 H_{2} O ) в. ( C H_{3} C H O H C H_{3} rightarrow C H_{3} C O O C H_{3}+H_{2} O_{2} ) ( mathbf{c} cdot B a O_{2}+C O_{2}+H_{2} O rightarrow B a C O_{3}+H_{2} O_{2} ) D. ( B a_{3}left(P O_{4}right)_{2}+3 H_{2} S O_{4} rightarrow 3 B a S O_{4}+2 H_{3} P O_{4} ) |
11 |
| 755 | In the reaction, ( boldsymbol{F e}+mathbf{2 H C l} rightarrow ) ( F e C l_{2}+H_{2} . ) what is the oxidation state of Fe in ( boldsymbol{F e C l}_{2} ) ? ( A cdot+2 ) ( B cdot+3 ) ( c cdot+4 ) D. +5 |
11 |
| 756 | Which of the following reaction produces hydrogen? A. ( M g+H_{2} O ) в. ( H_{2} S_{2} O_{8}+H_{2} O ) ( mathrm{c} cdot B a O_{2}+H C l ) D. ( N a_{2} O_{2}+2 H C l ) |
11 |
| 757 | In cation exchange resin, the cations of hard water get replaced by ( boldsymbol{K}^{+} ) ions. If this is true enter 1 , if false enter 0 . |
11 |
| 758 | Why do cold drink bottles breaks when kept in freezer? |
11 |
| 759 | LLCCLLC Q2. Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes? |
11 |
| 760 | Q.12 When sodium peroxide is treated with dilute sulphuric acid, we get (a) sodium sulphate and water (b) sodium sulphate and oxygen (C) sodium sulphate, hydrogen and oxygen (d) sodium sulphate and hydrogen peroxide |
11 |
| 761 | Q5. Explain the following: (i) Temporary hardness can remove by boiling (ii) Soft water lathers with soap but hard water not. |
11 |
| 762 | Which of the following properties can be assigned to water? I. It has a permanent dipole moment attributed to its molecular structure. Il. It is a very good conductor of electricity. III. It has its polar covalent bonds with hydrogen on opposite sides of the oxygen atom, so that the molecule is linear A. I only B. III only c. I and II only D. II and III only E . I, II and III |
11 |
| 763 | Bonds involving deuterium are: A. stronger than the corresponding bonds in hydrogen B. weaker than the corresponding bonds in hydrogen C . same as the corresponding bonds in hydrogen D. stronger than the corresponding bonds in tritum |
11 |
| 764 | ( H_{2} O_{2} ) oxidises ( H_{2} S ) to : A . ( S ) в. ( H_{2} S O_{4} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O}_{2} mathrm{O}_{8} ) D. ( H_{2} S O_{5} ) |
11 |
| 765 | Q. 34 What do you understand by the term ‘auto-protolysis of water? W its significance? |
11 |
| 766 | In the Merck’s process, the reagents involved for the preparation of hydrogen peroxide are: A. ( B a O_{2}, H C l ) в. ( N a_{2} O_{2}, H_{2} S O_{4} ) ( mathbf{c} cdot B a_{2} O_{2}, H_{2} C O_{3} ) ( mathrm{D} cdot P b O_{2}, H_{2} O ) |
11 |
| 767 | How aquatic animals survive is cold countries when temperature fall below ( mathbf{0}^{circ} mathbf{C} ? ) |
11 |
| 768 | Q. 26 Which of the following statements is correct? (a) Hydrides of group 13 act as Lewis acids (b) Hydrides of group 14 are electron deficient hydrides (c) Hydrides of group 14 act as Lewis acids (d) Hydrides of group 15 act as Lewis bases |
11 |
| 769 | Heavy water reacts with ( boldsymbol{C O}_{2}, boldsymbol{S O}_{3}, boldsymbol{P}_{2} boldsymbol{O}_{5} ) and ( boldsymbol{N}_{2} boldsymbol{O}_{5} ) respectively, to give the compounds: A. ( D_{2} C O_{3}, D_{2} S O_{4}, D_{3} P O_{2} ) and ( D N O_{2} ) в. ( D_{2} C O_{3}, D_{2} S O_{4}, D_{3} P O_{4} ) and ( D N O_{2} ) c. ( D_{2} C O_{3}, D_{2} S O_{3}, D_{3} P O_{4} ) and ( D N O_{2} ) D. ( D_{2} C O_{3}, D_{2} S O_{4}, D_{3} P O_{4} ) and ( D N O_{3} ) |
11 |
| 770 | Which of the following statements regarding hydrogen peroxide is/are incorrect? This question has multiple correct options A. The two hydroxy groups in hydrogen peroxide lie in the same plane B. Aqueous solution of ( H_{2} O_{2} ) turns blue litmus red C. When ( H_{2} O_{2} ) behaves as a reducing agent, the ( O-O ) bond in its molecules is not broken down D. Aqueous solution of ( H_{2} O_{2} ) is stored in plastic bottles and some urea, phosphoric acid or glycerol is added to that solution |
11 |
| 771 | Match the column – I with Column – II and pick up the correct answer: ( begin{array}{ll}text { Column – – } & text { Column -II } \ text { (I) Nickel } & text { A. Conversion }end{array} ) (II) ZSM-5 ( quad ) B. Alkylation of benzene I) ZSM-5 (III) ( S i O_{2} quad ) C. Hydrogenation ‘on A. B. I-A II – B III – C c. ( 1-mathrm{C} ) ॥ ( -mathrm{B} ) III ( -mathrm{A} ) D. I – B II – C III – B |
11 |
| 772 | Which combination cannot be used for the preparation of hydrogen gas in the laboratory? I. ( Z n / ) conc. ( H_{2} S O_{4} ) II. ( Z n / d i l . H N O_{3} ) III. ( Z n / d i l . H_{2} S O_{4} ) Zinc in I and II is not very pure while in III, it is very pure. A. I and II B. I, II and III c. ॥ा only D. I and III |
11 |
| 773 | Hydrogen is : A. electropositive B. electronegative C. both electronpositive as well as electronegative D. neither electropositive nor electronegative |
11 |
| 774 | When ( C O_{2} ) is bubbled through a solution of barium peroxide in water: A. carbonic acid is formed B. ( H_{2} O_{2} ) is formed ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) is formed D. barium hydroxide is formed |
11 |
| 775 | Which of the following is a linear molecule? A ( . H_{2} O ) в. ( H_{2} O_{2} ) ( c cdot D_{2} O ) D. ( N_{2} ), |
11 |
| 776 | ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{C l}_{2} rightarrow boldsymbol{2} boldsymbol{H} boldsymbol{O} boldsymbol{l} boldsymbol{l} ) A. True B. False |
11 |
| 777 | The temporary hardness of water is due to: A ( cdot C aleft(H C O_{3}right)_{2} ) B. ( N a C l ) ( mathbf{c} cdot N a_{2} S O_{4} ) D. ( C a C l_{2} ) |
11 |
| 778 | The kind of water is suitable for use is : A. hard water B. soft water c. both A and B D. none of above |
11 |
| 779 | Hydrogen occupies a unique position in Modern Periodic Table. A. True B. False |
11 |
| 780 | ( H_{2} O_{2} ) is an oxidant when it reacts with: ( A ) acidified ( K_{4}left[mathrm{Fe}(C N)_{6}right. ) B. alkaline ( K_{3}left[mathrm{Fe}(mathrm{CN})_{6}right] ) ( c cdot C l_{2} ) D. acidified ( K M n O_{4} ) |
11 |
| 781 | The oxidation state of oxygen in ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is: ( A cdot+1 ) B. – – ( c cdot+2 ) ( D cdot-2 ) |
11 |
| 782 | UULUTUNS Q1. Which isotope of hydrogen is radioactive? |
11 |
| 783 | 2. Metals above hydrogen in the activity series can displace ……… from dilute acids. |
11 |
| 784 | The volume strength of ( 15 % ) (w/v) solution of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is : A . 50 в. 4.94 c. 494 D. 0.494 |
11 |
| 785 | The best alternative to fossil fuels will be A. coal B. Animal fat c. Hydrogen D. Gasoline |
11 |
| 786 | 2.17 Elements of which of the following group(s) of periodic table do not form hydrides? (a) Groups 7, 8, 9 (b) Group 13 (c) Groups 15, 16, 17 (d) Group 14 |
11 |
| 787 | The isotope of hydrogen, ( D_{2} ) forms heavy water, ( D_{2} O . ) It is qualified as ( D_{2} O ) because it is: A. a heavy liquid B. an oxide of heavier isotope of oxygen c. an oxide of deuterium D. denser than water |
11 |
| 788 | What happens when dil. hydrochloric acid is added to iron filings? A. Hydrogen gas and iron chloride are produced B. Chlorine gas and iron hydroxide are produced c. No reaction takes place D. Iron salt and water are produced |
11 |
| 789 | Moist hydrogen peroxide cannot be dried over conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) because: A. it can catch fire B. it is reduced by ( H_{2} S O_{4} ) C . it is oxidised by ( H_{2} S O_{4} ) D. it is decomposed by ( H_{2} S O_{4} ) |
11 |
| 790 | Why is water not used as solvent synthesis of Grignard reagent? |
11 |
| 791 | Reaction of calgon with hard water containing ( C a^{2+} ) ions produces; ( mathbf{A} cdotleft[N a_{2} C a P_{6} O_{18}right]^{2-} ) в. ( C a_{2}left(P O_{4}right)_{3} ) ( mathrm{c} cdot mathrm{CaCO}_{3} ) D. ( operatorname{CaSO}_{4} ) |
11 |
| 792 | The sum of number of neutrons and protons in all the isotopes of hydrogen is : ( A cdot 2 ) B. 4 ( c cdot 5 ) D. 6 |
11 |
| 793 | Water is formed by the hydrogen and oxygen combined in the ratio 1: 9 by weight A. True B. False |
11 |
| 794 | 05PIUuuc ICE What is the use of hydrogen in the manufacture of Vanaspati Ghee? 1 |
11 |
| 795 | Hydrolith, a source of hydrogen is : A. ( N a H ) в. ( C a H_{2} ) c. ( L i H ) D. ( B a H_{2} ) |
11 |
| 796 | Q4. What is water gas? How is it prepared? | 11 |
| 797 | Very pure hydrogen ( (99.9 %) ) can be made by which of the following processes? A. Reaction of methane with steam B. Mixing natural hydrocarbons of high molecular weight c. Electrolysis of water D. Reaction of salt like hydrides with water |
11 |
| 798 | Compare the bond energy (B.E) of ( boldsymbol{O}- ) ( H ) in water and ( O-D ) in heavy water: A. B.E of ( O-H> ) B.E of ( O-D ) B. B.E of ( O-H< ) B.E of ( O-D ) c. B.E of ( O-H= ) B.E of ( O-D ) D. B.E of ( O-H=2 ) times B.E of ( O-D ) |
11 |
| 799 | Complete the following equation: ( boldsymbol{C l}_{2}+boldsymbol{H}_{2} boldsymbol{O} rightarrow ) A. ( H C l+H C l O ) в. ( H C l+O_{2} ) c. ( H C l O+O_{2} ) D. None of the above |
11 |
| 800 | Metal hydrides are ionic, covalent or molecular in nature. Among ( L i H, N a H, K H, R b H ) and ( C s H, ) the correct order of increasing ionic character is: A ( . L i H>N a H>C s H>K H>R b H ) в. ( L i H<N a H<K H<R b HC s H>N a H>K H>L i H ) D. ( N a H>C s H>R b H>L i H>K H ) |
11 |
| 801 | Ionic hydrides are usually: A. good electrical conductors when solid B. easily reduced C . good reducing agents D. liquid at room temperature |
11 |
| 802 | The volume strength of ( 3 N H_{2} O_{2} ) solution is: A . ( 11.2 mathrm{V} ) B. ( 8.4 mathrm{V} ) c. ( 22.4 mathrm{V} ) D. 16.8 V |
11 |
| 803 | Water is liquid at room temperature but not hydrogen sulphide. Why? | 11 |
| 804 | Heavy hydrogen has neutron and proton in the nucleus. |
11 |
| 805 | ( E_{O_{3} mid O_{2}}^{0} ) (acidic medium) ( =2.07 mathrm{V} ) ( E_{O_{3} mid O_{2}}^{0} ) (basic medium) ( =1.24 mathrm{V} ) ( E_{H_{2}}^{0} o_{2} mid H_{2} O ) (acidic medium) ( =1.78 mathrm{V} ) ( E_{O_{2} mid H_{2}}^{0} O_{2}(text { acidic medium })=0.695 mathrm{V} ) ( E_{O_{2} mid H_{2}}^{0},_{Omega_{2}} ) (basic medium) ( =0.076 mathrm{V} ) ( E_{H O_{2}^{-} mid O H^{-}}^{0}(text { basic medium })=0.878 mathrm{V} ) Using the above data, find which of the following is incorrect? A. Ozone is a better oxidising agent than ( H_{2} O_{2} ) in both acidic and basic medium. B. ( H_{2} O_{2} ) is better oxidising agent in acidic medium than in basic medium. C. ( H_{2} O_{2} ) is better reducing agent in basic medium than in acidic medium. D. In basic medium ( H_{2} O_{2} ) reduces all ( O_{3} ) to ( O_{2} ) completely. |
11 |
| 806 | When ( H_{2} O_{2} ) is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand? A. A blue colour is obtained in ether due to formation of ( C r_{2}left(S O_{4}right)_{3} ) B. A blue colour is obtained in ether due to formation of ( C r O_{5} ) c. A blue colour is obtained in ether due to formation of ( C r O_{3} ) D. Chromyl chloride is formed. |
11 |
| 807 | Q18. What do you understand by the term ‘auto-protolysis’ of water? what is its significance? Ans Autonotolutoin |
11 |
| 808 | 2. 64 Match Column I with Column II for the given properties/applications mentioned therein. Column A. H B. H₂ C H₂O D. HO Column II 1. used in the name of perhydrol. 2. can be reduced to dihydrogen by NaH. 3. can be used in hydroformylation of olefin. 4. can be used in cutting and welding. |
11 |
| 809 | Decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) can be prevented by addition of A . Acetanilide B. Benzene c. Alkali metal oxide D. ( M n O_{2} ) |
11 |
| 810 | Which of the following metals will react with ( N a O H ) and ( K O H ) to liberate hydrogen gas? A. ( Z n, A l, F e ) and ( M g ) в. ( A l, F e, M g ) and ( S n ) c. ( Z n, ) Sn and ( A l ) D. ( F e, M g ) and ( A l ) |
11 |
| 811 | Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process? |
11 |
| 812 | Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen. Explain why? |
11 |
| 813 | Which of the following information is true for structure of ( H_{2} O_{2} ) in solid phase? ( A ) в. ( c ) D. |
11 |
| 814 | What is the solution used for the preparation of hydrogen peroxide by electrolytic procedure? A ( .0 .2 N N a O H ) в. ( 50 % ) Н ( _{2} ) S ( O_{4} ) c. ( 20 % ) NaOH D. ( 5 % ) NaCl |
11 |
| 815 | Fill in the blanks: is the purest form of natural water |
11 |
| 816 | Ortho and para hydrogen differ: A. in the number of protons B. in the molecular mass C. in the nature of spins of protons D. in the nature of spins of electrons |
11 |
| 817 | An atomic hydrogen is: A. Electrically neutral B. positively charged C . negatively charged D. a free radical with one odd electron |
11 |
| 818 | Which of the following pair of substances can react to produce ( boldsymbol{H}_{2} ) gas? A. Hydrolith and water B. Sodium and heavy water c. ( mathrm{Hg} ) and Boiling water D. Iron and conc. sulphuric acid |
11 |
| 819 | State the position of hydrogen in the periodic table. |
11 |
| 820 | ( H_{2} O_{2} ) used in rocket has the concentration: A . ( 50 % ) B. ( 70 % ) ( c .30 % ) D. ( 90 % ) |
11 |
| 821 | ( H_{2} O_{2} ) has greater reactivity in basic medium. It is because bases catalyze the decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) A. True B. False |
11 |
| 822 | Hardness of water is due to soluble salts: A. Bicarbonates B. Sulphates c. chlorides D. All of these |
11 |
| 823 | Sodium is not used to form hydrogen gas. why? A. Sodium does not react with HC B. Sodium gives exothermic reaction with HC c. Sodium reacts violently with HCI D. Both B and C |
11 |
| 824 | Which one of the following pairs of substances on the reaction will not evolve ( boldsymbol{H}_{2} ) gas? A . Iron and ( H_{2} S O_{4}(a q) ) B. copper and ( H C l(g) ) c. Na and ( C_{2} H_{5} O H ) D. Iron and steam |
11 |
| 825 | Q11. Which gas is evolved when Mg N, (Magnesium nitride) is treated with H,0? Give chemical reaction. |
11 |
| 826 | Which of the following is not true for ( mathbf{1} boldsymbol{H}^{1}, mathbf{1} boldsymbol{H}^{2}, mathbf{1} boldsymbol{H}^{3} mathbf{?} ) A. They are isotopes of each other B. They have similar electronic configurations c. They exist in the nature in the ratio of 1: 2: 3 D. Their atomic masses are in the ratio of 1: 2: 3 |
11 |
| 827 | Why nascent hydrogen is more reactive than molecular hydrogen? A. The production of nascent hydrogen is associated with the release of high energy. This released energy activates the nascent hydrogen and makes it more energy rich than that of ordinary occurring molecular hydrogen. Because more energy means more reactivity, nascent hydrogen is more reactive than molecular hydrogen. B. In the time of formation nascent hydrogen is in the form of minute bubbles with high internal pressure which makes it more reactive. C. both ( A ) and ( B ) D. none of these |
11 |
| 828 | The reagent commonly used to determine hardness of water is: A . oxalic acid B. disodium salt of EDTA c. sodium citrate D. sodium thiosulphate |
11 |
| 829 | Q. 4 Which of the following hydrides is electron-precise hydride? (a) BH6 (b) NH, (c) H2O (d) CHA |
11 |
| 830 | The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is: ( mathbf{A} cdot mathbf{6} ) B. 5 ( c cdot 4 ) D. 3 |
11 |
| 831 | Permanent hardness of water is due to the presence of the bicarbonates of Ca, Mg and Fe. If this is true enter 1 , if false enter 0 . |
11 |
| 832 | The maximum number of hydrogen bonds in which water molecule can participate is: A . 1 B . 2 ( c .3 ) D. 4 |
11 |
| 833 | The hardness of a water sample containing ( 10^{-3} mathrm{M} M g S O_{4} ) expressed as ( C a C O_{3} ) equivalents(in ppm) is [molar mass of ( M g S O_{4} ) is 120.37 g/mol] |
11 |
| 834 | The density of water in ( k g m^{-3} ) is : A. 1000 в. 100 c. 10,000 D. 4000 |
11 |
| 835 | The isotopes of hydrogen are : A. Tritium and protium only B. Deuterium and tritium only C. Protium and deuterum only D. Protium, deuterium and trititum |
11 |
| 836 | Which of the following consists of one electron, one proton and zero neutron? ( mathbf{A} cdot_{1} H^{2} ) в. ( _{1} H^{1} ) ( mathbf{c} cdot_{1} H^{3} ) ( mathrm{D} cdot_{2} mathrm{He}^{4} ) |
11 |
| 837 | Which of the following metal gives hydrogen with all of these reactants: water, acids, alkalis? A. ( F e ) в. ( Z n ) c. ( M g ) D. Na |
11 |
| 838 | Types of hardness of water is : A. temporary and semi-permanent B. permanent and temporary C. permanent and partially permanent D. none of the above |
11 |
| 839 | Which compound is formed when calcium carbide reacts with heavy water? ( mathbf{A} cdot C_{2} D_{2} ) в. ( C a D_{2} ) c. ( C D_{2} ) D. ( C a_{2} d_{2} ) |
11 |
| 840 | Least reactive isotope of hydrogen among the following is: ( mathbf{A} cdot_{1} H^{1} ) B ( cdot_{1} D^{2} ) ( mathbf{c} cdot_{1} T^{3} ) D. all are equally reactive |
11 |
| 841 | Which of the following statements regarding hydrogen peroxide is false? A. It is a strong oxidising agent B. It is decomposed by ( M n O_{2} ) C. It behaves as a reducing agent D. It is more stable in Basic solution |
11 |
| 842 | 2. Assertion : The change of water from liquid to steam on heating is a physical change. Reason: The volume remains same and the change involves a change in composition. |
11 |
| 843 | The approximate concentration of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) in perhydrol is : A. 30 gm/litre B. ( 300 mathrm{gm} / mathrm{ml} ) c. ( 10 mathrm{gm} / ) /litre D. 300 gm/litre |
11 |
| 844 | 0.42 Dihydrogen reacts with dioxygen (02) to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer. |
11 |
| 845 | Some statements about heavy water are given below: (a) Heavy water is used as a moderator in nuclear reactions (b) Heavy water is more associated than ordinary water (c) Heavy water is more effective solvent than ordinary water Select correct statements: A. ( (a),(b) ) and ( (c) ) ( c ) B. ( (b) ) and ( (c) ) c. ( (a) ) and ( (c) ) D. ( (a) ) and ( (b) ) |
11 |
| 846 | How can the production of dihydrogen obtained from coal gasification, be increased? | 11 |
| 847 | Calculate the normality of 10 volume ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) A . ( 1.78 N ) в. 12 N c. ( 30.3 N ) D. ( 0.0303 N ) |
11 |
| 848 | Which one of the following removes temporary hardness of water? A. Slaked lime B. Plaster of paris c. ( C a C O_{3} ) D. Hydrolith |
11 |
| 849 | Chemically calgon is: A. sodium aluminosilicate B. sodium sulphate c. sodium hexa meta phosphate D. alkyl sulphonic acid |
11 |
| 850 | ( H_{2} O_{2} ) can be manufactured by the electrolysis of ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) solution A. True B. False |
11 |
| 851 | Decomposition of hydrogen peroxide is retarded in the presence of This question has multiple correct options A. alcohol B. glycerine c. manganese dioxide D. molybdenumm |
11 |
| 852 | Very pure hydrogen ( (99.9 %) ) can be made by ‘which of the following processes? A. Reaction of methane with steam B. Mixing natural hydrocarbons of high molecular weight c. Elecrolysis of water D. Reaction of salt like hydrides with water |
11 |
| 853 | Which is polymeric hydride? A. ( C a H_{2} ) в. ( M g H_{2} ) ( mathbf{c} cdot B a H_{2} ) D. ( operatorname{SrH}_{2} ) |
11 |
| 854 | Which of the above statements is(are) correct? This question has multiple correct options A. Atomic hydrogen is obtained by passing hydrogen through an electric arc. B. Hydrogen gas will not reduce heated aluminium oxide. C. Finely divided palladium adsorbs large volume of hydrogen gas. D. None of the above |
11 |
| 855 | Which isotope of hydrogen is/are radioactive in nature? A. Protium and deuterium B. Tritium only c. Tritium and deuterium D. Only deuterium |
11 |
| 856 | Peroxide ion (i) has five completely filled antibonding molecular orbitals (ii) is diamagnetic (iii) has bond order one (iv) is isoelectronic with neon Which one of these is correct? A. (ii) and (iii) B. (i), (ii) and (iv) c. (i), (ii) and (iii) D. (ii) and (iv) |
11 |
| 857 | Q12. Which compounds cause temporary hardness of water? | 11 |
| 858 | Uses of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) are: This question has multiple correct options A. rocket fuel with hydrazine B. oxidising agent C. removing hardness of water D. turn hair blonde/gold |
11 |
| 859 | Which property of water is used while washing clothes? A. Odour B. Colour c. solubility D. sand |
11 |
| 860 | The percentage of deuterium in heavy water is: A . 22.2 в. 11.2 c. 44 D. 20 |
11 |
| 861 | Water exists in which of the following state? A. solid B. liquid c. gas D. all of above |
11 |
| 862 | The molecular weight of heavy water is than ordinary water | 11 |
| 863 | Name the element in the periodic table forming a maximum number of compounds? A. carbon B. Hydrogen c. oxygen D. Fluorine |
11 |
| 864 | ( ln operatorname{lab} H_{2} mathrm{O}_{2} ) is prepared by A ( cdot ) cold ( H_{2} S O_{4}+B a O_{2} ) в. ( H C l+B a O_{2} ) c. ( operatorname{conc.H}_{2} mathrm{SO}_{4}+mathrm{Na}_{2} mathrm{O}_{2} ) D. ( H_{2}+O_{2} ) |
11 |
| 865 | At absolute zero temperature: A. only para hydrogen exists B. only ortho hydrogen exists C. both para and ortho hydrogen exist D. none of these |
11 |
| 866 | Q15. Saline hydrides are known to react with water violently producing fire. Can Cuy a well known fire extinguisher, be used in this case? Explain. |
11 |
| 867 | The production of dihydrogen gas via water gas shift reaction ( boldsymbol{C O}_{(boldsymbol{g})}+boldsymbol{H}_{2} boldsymbol{O}_{(boldsymbol{g})} stackrel{Delta}{longrightarrow} boldsymbol{C} boldsymbol{O}_{2}(boldsymbol{g})+boldsymbol{H}_{2(boldsymbol{g})} ) The ( C O_{2} ) gas is removed by scrubbing with solution of? A. sodium arsenite B. Calcium oxide c. Sodium phosphate D. aluminium oxide |
11 |
| 868 | Some statements about heavy water are given below. (i) Heavy water is used as moderator in nuclear reactors (ii) Heavy water is more associated then ordinary water (iii) Heavy water is more effective solvent than ordinary water Which of the above statements are correct? A ( cdot ) (i) and (ii) B. (i), (ii) and (iii) c. (ii) and (iii) D. (i) and (iii) |
11 |
| 869 | Explain hydrogen exist on earth in atomic form or molecular form? | 11 |
| 870 | 15. Which type of hydrides are generally non-stoichiometric in nature? | 11 |
| 871 | ( 100 mathrm{ml} ) of tap water containing ( boldsymbol{C a}left(boldsymbol{H} boldsymbol{C O}_{3}right)_{2} ) was titrated with ( mathrm{N} / 50 ) ( boldsymbol{H} boldsymbol{C l} ) with methyl orange as indicator. If ( 30 mathrm{ml} ) of ( H C l ) were required, calculate the temporary hardness as part of ( mathrm{CaCO}_{3} ) per ( 10^{6} ) parts of water. A. 150 ppm B. 300 ppm c. 450 ppm D. 600 ppm |
11 |
| 872 | A. Hude C. 66 Match the items in Column I with the relevant item in Column II. Column! Column Il Hydrogen peroxide is used as a 1. zeolite Used in Calgon method 2. perhydrol С. Permanent hardness of hard 3. sodium hexametaphosphate water is removed by 4. propellant ne A ya 41 102 |
11 |
| 873 | Assertion: ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is more powerful oxidant in alkali medium. Reason: ( E_{o, p}^{o} H_{2} O_{2}=-1.77 mathrm{V} ) (in acid) and ( E_{o, p}^{o} H_{2} O_{2}=-0.87 mathrm{V} ) (in alkali). A. Both Assertion and Reason are correct and Reason is correct explanation of Assertion B. Both Assertion and Reason are correct but Reason is not correct explanation of Assertion C . Assertion is correct but Reason is wrong D. Assertion is wrong but Reason is correct |
11 |
| 874 | Hydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of ( C O ) and ( boldsymbol{H}_{2} ) gas is formed called: This question has multiple correct options A. water gas B. syngas c. producer gas D. industrial gas |
11 |
| 875 | Given below are the elements and the type of hydrides formed by them mark the incorrect match A. Phosphourus-molecular hydride B. Potassium-lonic hydride c. Vanadium-Interstitial hydride D. Nitrogen-Electron-deficient covalent hydride |
11 |
| 876 | Select the incorrect statement from the following: A ( cdot H^{+} ) can as ( H_{9} O_{4}^{+} ) in water B. ( H_{2} ) is thermally stable C. lonization of ( C H_{3} mathrm{COOH} ) is slower than that of ( C H_{3} ) COOD D. Kinetic isotopic effect is observed when there is retardation in the rate if ( H_{2} O ) is replaced by ( D_{2} O ) |
11 |
| 877 | Hydrogen burns with: A. smoky flame B. yellow flame C. blue flame D. pale yellow flame |
11 |
| 878 | Assertion Hydrogen is a diatomic molecule. Reason Hydrogen atom has a single electron in its outermost shell A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
| 879 | 20. Give an example of an ionic hydride and a covalent hydride: Ann MU . . 1 1 . 1 |
11 |
| 880 | In which property listed below hydrogen does not resemble alkali metals? A. Tendency to form cation B. Nature of oxide c. Combination with halogens D. Reducing character |
11 |
| 881 | By which reaction, formation of hard water takes place? (a) (b) ( (c) ) ( (d) ) A. by only ( d ) B. by only ( a ) c. by ( a, b, c ) D. by all processes |
11 |
| 882 | Q2. Can we use concentrated sulphuric acid and pure zinc in the preparation of dihydrogen? Write the chemical reactions to show the amphoteric nature of water. Why is hydrogen peroxide stored in wax-lined plastic coloured bottles? |
11 |
| 883 | Heavy hydrogen has neutron and ( — ) proton in the nucleus. A . 2 and 1 B. 1 and 2 c. 1 and 1 D. 2 and 2 |
11 |
| 884 | Inspite of danger involved with hydrogen, it is used as fuel for some applications. What are these? A. Rocket fuel B. Oxyhydrogen flame c. carfuel D. All of the above |
11 |
| 885 | The correct order of reactivity among the following is I) atomic hydrogen II) dihydrogen III) nascent hydrogen c. ॥>॥|>1 D. III>II> |
11 |
| 886 | Hardness of water is mainly due to the B. calcium and sodium c. sodium and magnesium D. calcium and potassium |
11 |
| 887 | HOTS The various types of hydrides and examples of each type are given below: Hydride type Compound A Electron deficient B Saline ( quad ) ii ( quad boldsymbol{C H}_{4} ) C Electron-precise iii ( quad N H_{3} ) D Interstitial ( quad ) iv ( quad B_{2} H_{6} ) E Electron rich ( mathbf{v} quad mathbf{C r H} ) Choose the correct matching from the code given below: ( A cdot(A)-(i i),(B)-(i v),(C)-(v),(D)-(i i i),(E)-(i) ) B. (A)-(iv), (B) – (i), (C) – (ii), (D) – (v), (E) – (iii) ( c cdot(A)-(i v),(B)-(i i i),(C)-(v),(D)-(i i),(E)-(i) ) ( D cdot(A)-(v),(B)-(i i i),(C)-i(v),(D)-(i i),(E)-(i) ) |
11 |
| 888 | ( H_{2} O_{2} ) decolourises ( K M n O_{4} ) in acid medium. A. True B. False |
11 |
| 889 | ( H_{2} O_{2} ) involves in the reaction as an oxidising agent, when it is added to: A ( . ) CaOCl в. ( O_{3} ) c. ( A g_{2} O ) D. KI |
11 |
| 890 | In the laboratory preparation of Dihydrogen,which of the following species is oxidised? A. ( Z n ) в. ( H_{2} ) c. Both A and B D. None |
11 |
| 891 | Q31. What is the difference between the terms ‘hydrolysis’ and ‘hydration’? 1 . 1 .: shetan vanato |
11 |
| 892 | Explain why apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame? | 11 |
| 893 | lonic hydride reacts with water to give: A. hydride ions B. acidic solution c. protons D. basic solution |
11 |
| 894 | Calcium carbide + heavy water ( rightarrow ? ) The product of the above reaction is: A. ( C_{2} H_{2} ) в. ( C a D_{2} ) ( mathbf{c} cdot operatorname{Ca}(O D)_{2} ) D. ( C D_{4} ) |
11 |
| 895 | Dihydrogen reacts with dioxygen ( left(O_{2}right) ) to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer. |
11 |
| 896 | We can cook pulses easily in hard water A. True B. False |
11 |
| 897 | Which of the following elements is used for vulcanizing rubber? A. sulphue B. chlorine c. bromine D. phosphorus |
11 |
| 898 | Nascent hydrogen is most powerful reducing agent than ordinary hydrogen because: A. nascent hydrogen is in atomic state and atoms are more active than molecules B. nascent hydrogen is evolved in small bubbles containing the gas under great pressure C. nascent hydrogen is activated by the energy liberated in the reaction in which it is formed, so the nascent hydrogen becomes more energized and active D. all of them |
11 |
| 899 | Q.52 An acidic solution of hydrogen peroxide behaves as an oxidising as well as reducing agent. Illustrate it with the help of a chemical equation. |
11 |
| 900 | Q12. How do you expect the metallic hydrides to be useful for hydrogen storage? Explain. 17. to the adsorntion |
11 |
| 901 | Q.9 Which of the following equation depicts reducing nature of H2O2? (a) 2[Fe(CN)614- + 2H+ + H202 2[Fe (CN)- + 2H2O (b) I, + H2O2 + 20H- 21 + 2H,0 + O2 (c) Mn2+ + H,02 Mn++ + 2OH (d) Pbs + 4H,02 PbSO4 + 4H20 din contin alkaline media. The |
11 |
| 902 | Which of the following metals, absorb hydrogen? This question has multiple correct options ( A cdot Z n ) B. Pd ( c cdot P t ) D. |
11 |
| 903 | Permanent hardness is caused due to: A. magnesium bicarbonate B. magnesium carbonate C. magnesium sulphate D. all of the above |
11 |
| 904 | Heavy water ( left(D_{2} Oright) ) is used in Atomic Reactors as – A. Coolant B. Controller c. shield D. Moderator |
11 |
| 905 | Which of the following statement is/are true for ( _{1} boldsymbol{H}^{1},_{1} boldsymbol{H}^{2} ) and ( _{1} boldsymbol{H}^{3} ) respectively? This question has multiple correct options A. They are isotopes of each other B. They have similar electronic configuration c. They exist in the nature in the ratio 1: 2: 3 D. Their atomic masses are in the ratio 1: 2: 3 |
11 |
| 906 | Water containing heavier isotope of oxygen is known as water | 11 |
| 907 | If true enter 1 , else enter 0 . The formula for heavy water is ( boldsymbol{H}_{3} boldsymbol{O}^{+} ) |
11 |
| 908 | Speed of decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) is reduced by : A. ( N a_{2} C O_{3} ) в. ( N a O H ) c. alcohol D. platinum |
11 |
| 909 | Atoms present in a molecule of heavy water are: A. ( _{1} H^{1},_{8} O^{16} ) B . ( _{1} H^{2},_{8} O^{18} ) c. ( _{1} H^{2},_{8} O^{16} ) D. ( _{1} H^{1},_{8} O^{18} ) |
11 |
| 910 | Organic ion exchange resins purify hard water to yield: A. Distilled water B. Only decalcified water c. Deionised water D. water having relatively high concentration of ( O H^{-} ) ion |
11 |
| 911 | Water has maximum density at A. Room temperature B. ( 4^{circ} mathrm{C} ) ( c cdot 0^{o} C ) D. ( -4^{circ} C ) |
11 |
| 912 | The weight of one mole of heavy water is: A. ( 18 mathrm{gm} ) B. ( 20 mathrm{gm} ) c. ( 19 mathrm{gm} ) D. 21 gm |
11 |
| 913 | 6. The higher density of water than that of ice is due to (a) dipole-dipole interaction (b) dipole-induced dipole interaction (c) hydrogen bonding (d) all of these |
11 |
| 914 | Heavy water violence is formed on combining ( _{-}–_{-}- ) with |
11 |
| 915 | Hydrogen gas is passed through oil in order to: A. convert lower oil to higher oil B. convert liquid oil into solidified oil c. convert unsaturated hydrocarbon to saturated hydrocarbon D. all the above statements are wrong |
11 |
| 916 | Ratio of hydrogen to oxygen in water is: A .2: 1 B. 1: 2 ( c cdot 7: 1 ) D. 8: 1 |
11 |
| 917 | Hydrogen is the most abundant element on earth after oxygen If this is true enter 1 , if false enter 0 . |
11 |
| 918 | Q. 50 What is the importance of heavy water? | 11 |
| 919 | According to recent views, which is the current representation of hydrated proton in aqueous solution? ( mathbf{A} cdot H^{+} ) B. ( H_{9} O_{5}^{+} ) c. ( H_{9} O_{4}^{+} ) D. ( H_{3} O^{+} ) |
11 |
| 920 | Hydrogen is: A. electropositive B. electronegative C. both electropositive as well as electronegative D. neither electropositive nor electronegative |
11 |
| 921 | How does ( H_{2} O_{2} ) behave as a bleaching agent |
11 |
| 922 | From the following statements regarding ( H_{2} O_{2}, ) choose the incorrect statement? A. It can act only as an oxidizing agentt B. It decomposes on exposure to light. c. It has to be stored in plastic or wax, lined glass bottles in dark. D. It has to be kept away from dust |
11 |
| 923 | Sodium hexa-metaphosphate is known as: A . calgon B. permutit c. natalite D. nitrolim |
11 |
| 924 | Q. 10 Hydrogen peroxide is …….. (a) an oxidising agent (b) a reducing agent (c) both an oxidising and a reducing agent (d) neither oxidising nor reducing agent |
11 |
| 925 | Water ( left(boldsymbol{H}_{2} boldsymbol{O}right) ) is liquid while all other molecules of equivalent and even higher molecular weight are present in gaseous state because of A. covalent bonding between Hydrogen and Oxygen B. Electrostatic attraction among water molecules c. Hydrogen bonds. D. lonic bonds |
11 |
| 926 | ( H_{2} O_{2} ) is obtained by the action of dilute ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) on: ( mathbf{A} cdot M n O_{2} ) в. ( P b O_{2} ) ( mathrm{c} cdot B a O_{2} ) D. ( S n O_{2} ) |
11 |
| 927 | ( H_{2} O_{2} ) turns blackened lead paintings to white colour. In this reaction it oxidizes PbS to ( P b S O_{4} ). The number of moles of ( H_{2} O_{2} ) needed to oxidize 0.1 moles of ( P b S ) is: A . 1 mole B. 0.1 mole c. 0.5 mole D. 0.4 mole |
11 |
| 928 | The weight of one hydrogen atom is: ( mathbf{A} cdot 1.66 times 10^{-27} k g ) В. ( 2.66 times 10^{-27} k g ) C ( cdot 1.76 times 10^{-27} mathrm{kg} ) D. ( 1.66 times 10^{-37} k g ) |
11 |
| 929 | Match the column I with column II and mark the appropriate choice. and ( begin{array}{ll}text { column } & text { column I } \ 1end{array} ) Interstitial hydride ( A ) 4 A Nat [ C H_{4} ] ii Molecular hydride В ( C ) ( V H_{0.56} ) ( B_{2} H_{6} ) iii lonic hydride Electron deficient hydride iv A. ( (A) rightarrow(i i i),(B) rightarrow(i v),(C) rightarrow(i i)(D) rightarrow(i) ) B. ( (A) rightarrow(i i),(B) rightarrow(i v),(C) rightarrow(i i i)(D) rightarrow(i) ) c. ( (A) rightarrow(i),(B) rightarrow(i i),(C) rightarrow(i v)(D) rightarrow(i i i) ) D. ( (A) rightarrow(i i i),(B) rightarrow(i i),(C) rightarrow(i)(D) rightarrow(i v) ) |
11 |
| 930 | The product(s) formed when ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) reacts with disodium hydrogen phosphate is: A ( cdot P_{2} O_{5}, N a_{3} P O_{4} ) в. ( N a_{2} H P O_{4} cdot H_{2} O_{2} ) c. ( N a H_{2} P O_{4} cdot H_{2} O ) D. ( N a_{2} H P O_{4} cdot H_{2} O ) |
11 |
| 931 | 0.1 Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect? (a) Its tendency to lose an electron to form a cation (b) Its tendency to gain a single electron in its valence shell to attain stable electronic configuration (c) Its low negative electron enthalpy value (d) Its small size hologon in many resnects for which several factors are |
11 |
| 932 | 08. What type of elements form interstitial hydrides? | 11 |
| 933 | Atoms in hydrogen have abundance of: A ( cdot_{1} H^{1} ) atoms B. ( _{1} D^{2} ) atoms ( mathbf{c} cdot_{1} T^{3} ) atoms D. all three are in equal proportions |
11 |
| 934 | ( H_{2} ) is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because: A. it is chemically unstable. B. the storage of ( H_{2} ) is very risky and can causes explosion. c. it is very expensive. D. it causes the corrosion of containers in which it is present |
11 |
| 935 | Arrange the following. (i) ( C a H_{2}, B e H_{2} ) and ( T i H_{2} ) in order of increasing electrical conductance. (ii) ( L i H, N a H ) and ( C s H ) in order of increasing ionic character. (iii) ( boldsymbol{H}-boldsymbol{H}, boldsymbol{D}-boldsymbol{D} ) and ( boldsymbol{F}-boldsymbol{F} ) in order of increasing bond dissociation enthalpy. (iv) ( N a H, M g H_{2} ) and ( H_{2} O ) in order of increasing reducing property. |
11 |
| 936 | When ( H_{2} O_{2} ) mixed with ( N H_{3} ) is applied to hair, the colour of the hair changes to : A. silvery B. ivory white c. golden yellow D. brown |
11 |
| 937 | Which of the following absorbs largest volume of hydrogen? A. Colloidal palladium B. Finely divided nickel c. colloidal ferric hydroxide D. Finely divided platinum |
11 |
| 938 | Why water is called an universal solvent? A. Because plants use water for taking minerals from the soil B. Water can dissolve a wide variety of substances C. Water is clear and transparent D. None of the above |
11 |
| 939 | Rogue element in the periodic table is A. oxygen B. hydrogen c. astatine D. rhenium |
11 |
| 940 | The usage of dihydrogen is: ( mathbf{A} cdot ) It acts a a fuel cell B. Energy is distributed in the form of dihydrogen C. It is economical fuel D. All of the above |
11 |
| 941 | ( H_{2} O_{2} ) is formed by which of the following compound? A ( cdot N a_{2} O_{2} ) в. ( N a O H ) c. ( N a_{2} ) Q D. ( K O_{2} ) |
11 |
| 942 | When ( H_{2} O_{2} ) reacts with ozone, and forms ( H_{2} O ) and ( O_{2} . ) In this reaction ( O_{2} ) is released by: This question has multiple correct options A ( . H_{2} O ) в. ( O_{3} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O}_{2} ) D. ( O_{2} ) |
11 |
| 943 | Do you observe anything happening around the zinc granules? Is there any change in its temperature? Why is glass tube not dipped in di ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) How is ( H_{2} ) gas collected by downward displacement or upward displacement of water? Is ( H_{2} ) gas soluble or insoluble in water? |
11 |
| 944 | Which of the following will produce hydrogen on decomposition by metals like ( N a, K, C a ? ) A. Boiling water B. Steam c. cold water D. All of the above |
11 |
| 945 | Which of the following reactions will not produce ( H_{2} ) gas? (a) Fe+dil. HCI (b) ( mathrm{Zn}+ ) dil. HCl (c) ( mathrm{Cu}+ ) dil. ( mathrm{HCl} ) (d) ( A g+d i l . H C l ) ( A cdot a, c, d ) B. ( c, d ) ( c cdot a, d ) ( D cdot b, d ) |
11 |
| 946 | Why does hydrogen resemble both group ( I ) and group 17 elements? |
11 |
| 947 | Among statements (a)-(d), the correct ones are: (a) Decomposition of hydrogen peroxide gives dioxygen. (b) Like hydrogen peroxide, compounds, ( operatorname{such} ) as ( K C l O_{3}, P bleft(N O_{3}right)_{2} ) and ( N a N O_{3} ) when heated liberate dioxygen. (c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide. (d) Hydrogen peroxide is used for the manufacture of sodium perborate. ( A cdot(a),(b) ) and ( (c) ) only B. (a) and (c) only ( c cdot(a),(b),(c) ) and ( (d) ) D. (a), (c) and (d) only |
11 |
| 948 | toppr Q Type your question. ( boldsymbol{H}_{2} boldsymbol{O}_{2(l)} rightarrow boldsymbol{H}_{2} boldsymbol{O}_{(l)}+frac{1}{2} boldsymbol{O}_{2(g)} ; boldsymbol{Delta}_{r} boldsymbol{G}^{o}= ) ( -122.6 k J / m o l ) As the reaction from left to right is accompanied by a decrease in free energy, it is a spontaneous process. However, its decomposition at ( 25^{circ} mathrm{C} ) in the absence of catalysts is slow. The catalysts which accelerate decomposition are ( mathrm{Pt}, ) Ag, cobalt, iron, copper, manganese dioxide and light. Concentrated ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) solution can result into uncontrolled decompositions leading to explosion. ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) thus stored in colored wax-lined bottles (as rough glass surfaces) also causes its decomposition. A few stabilizers such as acids acetanilide, pyrophosphates, and stannates are added to slow down the decomposition of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) ( H_{2} O_{2} ) is stored in colored wax-lined bottles because: A. it is radioactive B. it produced uncontrolled decompositions leading to explosion C. it is non-polar molecule D. none of these |
11 |
| 949 | Hydrogen resembles halogen in many respect for which several factors are responsible. Of the following factors which one is the most important in this respect? A. Its tendency to lose electron B. Its tendency to gain electron in its valence shell c. Its low negative electron gain enthalpy D. Its small size |
11 |
| 950 | Heavy water is used as in nuclear reactor. A. controller B. moderator c. promoter D. none of these |
11 |
| 951 | What is the mass of a mole of water containing ( 50 % ) of heavy water ( left(D_{2} Oright) ? ) ( A cdot 18 g ) B. 198 ( c cdot 20 g ) D. 21 |
11 |
| 952 | Silicon hydrides are called: A. silicones B. silicates C . silicides D. silanes |
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| 953 | Hydrogen does not combine with: A. antimony B. sodium C. bismuth D. helium |
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| 954 | Water containing impurities doesn’t freeze at ( 0 . ) Explain? | 11 |
| 955 | Which of the one is correct about Hydrogen? A. resembles in IA since it forms monovalent cation ( H^{+} ) B. resembles in VIIA (halogen family) since it forms monovalent anion ( H^{-} ) C. resembles in IVA(carbon family) since both have a half filled shell of electron D. all of the above |
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| 956 | What is the oxidation state of ( F e ) in the product formed when acidified potassium ferrocyanide is treated with ( boldsymbol{H}_{2} boldsymbol{O}_{2} ? ) ( A cdot+2 ) B. +6 ( c cdot+1 ) D. +3 |
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| 957 | Assertion : By passing electric current through water, we can decompose it into hydrogen and oxygen. Reason : Water is a compound whereas hydrogen and oxygen are elements. |
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| 958 | ( D_{2} O ) will have maximum density at : ( mathbf{A} cdot 9^{circ} C ) B. ( 11.5^{circ} mathrm{C} ) ( mathbf{c} cdot 15.9^{circ} mathrm{C} ) D. ( 20^{circ} mathrm{C} ) |
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| 959 | Q19. Consider the reaction of water with F, and suggest, in terms of oxidation and reduction, which species are oxidised/reduced? |
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| 960 | What is the molecular weight of water? A . 2 B. 18 c. 20 D. 16 |
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| 961 | Elements of which of the following ( operatorname{group}(s) ) of periodic table do not form hydrides? A. Groups 7, 8, 9 B. Group 13 c. Groups 15,16,17 D. Group 14 |
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| 962 | The peroxide linkage ( (-O-O-) ) is not present in: A ( . H_{2} S O_{5} ) в. ( C r O_{5} ) c. ( H N O_{4} ) D. ( H C l O_{4} ) |
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| 963 | Why is tritium called as beta-emitter? | 11 |
| 964 | In the laboratory process of hydrogen production, we use impure zinc because: A. pure zinc is very costly B. there is risk of explosion with pure c. impurity in zinc act as catalyst D. pure zinc is not easily available |
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| 965 | The volume of ( O_{2} ) gas at S.T.P. obtained by the decomposition of 1 c.c. of ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) solutionis known as its volume strength. If this is true enter 1 , if false enter 0 . |
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| 966 | Which of the following substances cause permanent hardness of water? A. ( C a C l_{2} ) в. ( mathrm{Ca}left(mathrm{HCO}_{3}right)_{2} ) c. ( C a C O_{3} ) D. All of the above |
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| 967 | ( M n^{+2} rightarrow M n O_{4}^{-} ) Suggest suitable reagent? A . acidic hydrogen peroxide B. Acidic Pbo ( _{2} ) ( mathbf{c} cdot N a B i O_{3} ) D. ( K_{2} C r O 7 ) |
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| 968 | An inorganic substance liberates oxygen on heating and turns an acidic solution of ( K I ) brown and reduces acidified ( K M n O_{4} ) solution. The substance is: A. ( H g O ) в. ( H_{2} O_{2} ) c. ( K n O_{3} ) D ( cdot operatorname{Pb}left(N O_{3}right)_{2} ) |
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| 969 | One litre of a samle of hard water contains ( 1 mathrm{mg} ) of ( mathrm{CaCl}_{2} ) and ( 1 mathrm{mg} ) of ( M g C l_{2} ). Then the total hardness in terms of parts of ( C a C O_{3} ) per ( 10^{8} ) parts of water by mass is: A. ( 1.954 mathrm{ppm} ) B. 1.260 c. 0.946 D. none of these |
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| 970 | Balance the chemical reaction of laboratory preparation method of dihydrogen: A. ( Z n+2 H^{+} rightarrow Z n^{2+}+H_{2} ) B. ( Z n^{2+}+2 H^{-} rightarrow Z n+H_{2} ) c. ( Z n^{2+}+2 H^{+} rightarrow Z n^{2+}+H_{2} ) D. None of the above |
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| 971 | In transforming 0.01 mole of ( P b S ) to ( P b S O_{4}, ) the volume of 10 volume ( H_{2} O_{2} ) required will be: A. ( 11.2 mathrm{mL} ) B. ( 22.4 mathrm{mL} ) c. ( 33.6 m L ) D. ( 44.8 mathrm{mL} ) |
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| 972 | ( R H_{2} ) (ion exchange resin ) can replace ( C a^{2+} ) in hard water as: ( boldsymbol{R} boldsymbol{H}_{2}+boldsymbol{C} boldsymbol{a}^{2+} rightarrow boldsymbol{R} boldsymbol{C} boldsymbol{a}+boldsymbol{2} boldsymbol{H}^{+} ) One litre of hard water after passing through ( R H_{2} ) has ( mathrm{pH}=2 . ) Hence, hardness in ppm of ( C a^{2+} ) is: A . 200 B. 100 ( c .50 ) D. 125 |
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| 973 | ( Z n+H_{2} S O_{4} rightarrow A ) If we bring a burning splinter near the gas produced in the given reaction,it burns with a pop sound. The gas ( A ) is: ( A cdot O_{2} ) в. ( N_{2} ) ( mathrm{c} cdot mathrm{H}_{2} ) D. ( C O_{2} ) |
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| 974 | Water plays an important role in : A. hydrological cycle B. water cycle c. both A and B D. none of above |
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| 975 | Q21. Describe the structure of common form of io. VACANT SPACES 177pm 95.7pm (a) Structure of water in the liquid state (b) Tetrahedral arrangement of oxygen atoms in ice. |
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| 976 | Assertion Temporary hardness in water is due to presence of chlorides of Magnesium. Reason Temporary hardness is removed by |
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| 977 | The product obtained at anode when ( mathbf{5 0 %} boldsymbol{H}_{mathbf{2}} boldsymbol{S O}_{mathbf{4}} ) aqueous solution is electrolysed using platinum electrodes is : A. ( H_{2} S O_{3} ) B. ( H_{2} S_{2} O_{8} ) ( c cdot O_{2} ) D. ( H_{2} ) |
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| 978 | Given below are the two reactions of ( H_{2} O_{2} . ) Mark the correct statement which follows: ( (mathrm{i}) 2 mathrm{K} M n O_{4}+3 mathrm{H}_{2} mathrm{SO}_{4}+5 mathrm{H}_{2} mathrm{O}_{2} rightarrow ) ( boldsymbol{K}_{2} boldsymbol{S} boldsymbol{O}_{4}+boldsymbol{2} boldsymbol{M} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4}+boldsymbol{8} boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{5} boldsymbol{O}_{2} ) (ii) ( 2 C r(O H)_{3}+4 N a O H+ ) ( mathbf{3} boldsymbol{H}_{2} boldsymbol{O}_{2} rightarrow boldsymbol{2} boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C r} boldsymbol{O}_{4}+boldsymbol{8} boldsymbol{H}_{2} boldsymbol{O} ) A . (i) Shows oxidizing nature of ( H_{2} O_{2} ) and (ii) shows reducing nature of ( H_{2} O_{2} ) B. ( ln left(text { i) } H_{2} O_{2} ) acts as a reducing agent and in (ii) it acts right. as an oxidizing agent ( c cdot ln operatorname{both}(i) ) and (ii), ( H_{2} O_{2} ) acts as an oxidizing agent D. In both (i) and (i), ( H_{2} O_{2} ) acts as a reducing agent |
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| 979 | ( D_{2} O ) can be obtained by: This question has multiple correct options A. repeated distillation B. exchange process C. neutron emitting radioactive decay in presence of water D. exhaustive electrolysis of alkaline water |
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| 980 | The reaction of aqueous ( K M n O_{4} ) with ( H_{2} O_{2} ) in acidic conditions gives: ( A cdot M n^{4+} ) and ( O_{2} ) B. ( M n^{2+} ) and ( O_{2} ) c. ( M n^{2+} ) and ( O_{3} ) D. ( M n^{4+} ) and ( M n O_{2} ) |
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