We provide the p-block elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the p-block elements skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of the p-block elements Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Fluorine is highly reactive because: A. F-F bond energy is high B. F-F bond energy is low C. it is gaseous at room temperature D. Fhas a smaller size |
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| 2 | True or False The phenomenon of existence of an element in more than one physical form is called allotropy. A. True B. False |
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| 3 | One mole of magnesium nitride on reaction with an excess of water gives: A. one mole of ammonia B. one mole of nitric acid c. two moles of ammonia D. two moles of nitric acid |
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| 4 | Which of the following statements is not correct for ( boldsymbol{S O}_{2} ) gas? A. It acts as bleaching agent in moist conditions. B. Its dilute solution is used as disinfectant. C. Its molecules have linear geometry. D. Acidified ( K M n O_{4} ) is decolourised when ( S O_{2} ) is passed through it |
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| 5 | (a) Draw the structures of the following molecules: (i) ( boldsymbol{X} boldsymbol{e} boldsymbol{O} boldsymbol{F}_{boldsymbol{4}} ) (ii) ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) (b) Write the structural difference between white phosphorus and red phosphorus. |
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| 6 | Which of the following is a red liquid? A. ( S F_{4} ) в. ( S F_{6} ) c. ( S C l_{2} ) D. ( S_{2} C l_{2} ) |
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| 7 | Which one of the following ionic species has the greatest proton affinity to form the stable compound? ( mathbf{A} cdot I^{-} ) в. ( H S^{-} ) ( mathbf{c} cdot N H_{2}^{-} ) D. ( F^{-} ) |
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| 8 | Borax is actually made of two tetrahera and two triangular units joined together and should be written as: [ N a_{2}left[B_{4} O_{5}(O H)_{4}right] .8 H_{2} O ] Consider the following statements about borax. This question has multiple correct options A. Each boron atom has four ( B-O ) bonds B. Each boron atom has three ( B-O ) bonds C. Two boron atoms have four ( B-O ) bonds while other two have three ( B-O ) bonds D. Each boron atom has one ( -O H ) groups |
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| 9 | On reaction with unsaturated hydrocarbons, Type ( boldsymbol{X} boldsymbol{Y} ) interhalogen compounds gives: A. displacement reaction B. addition reaction c. substitution reaction D. none of these |
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| 10 | The compound which does not possess a peroxide linkage is: A. ( N a_{2} O_{2} ) в. ( C r O_{5} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{5} ) D. ( P b O_{2} ) |
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| 11 | Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other? A. is soluble in water B. is used as a food-preservative. c. forms ‘acid-rain’. D. is a reducing agent |
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| 12 | When ozone reacts with unsaturated hydrocarbons, the products formed are called: A . ozonites B. ozonides c. carbazone D. unsaturated ozone |
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| 13 | Bone ash mainly contains: A. ( mathrm{CaO} ) в. ( mathrm{Ca}_{3}left(mathrm{PO}_{4}right)_{2} ) ( mathrm{c} cdot mathrm{CaCl}_{2} ) D. ( mathrm{NH}_{2} mathrm{NH}_{2} ) |
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| 14 | How is Chlorine prepared by electrolyt method? Explain its reaction with: (a) excess ( N H_{3} ) (b) cold and dil. NaOH (c) slaked lime |
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| 15 | Diaspore, germanite and gallite have: A. boron B. aluminium c. gallium D. indium |
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| 16 | The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total ( p- ) and ( s ) -electrons, is: A. ( H e ) в. ( N e ) ( c . A r ) D. ( K r ) |
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| 17 | When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation: ( boldsymbol{x} boldsymbol{C u}+boldsymbol{y} boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} longrightarrow boldsymbol{C u}left(boldsymbol{N} boldsymbol{O}_{3}right)_{2}+ ) ( N O+N O_{2}+H_{2} O ) The coefficients of ( x ) and ( y ) are respectively: ( A cdot 2 ) and 3 B. 2 and 6 c. 1 and 3 D. 3 and 8 |
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| 18 | Nitric acid undergoes self dissociation. A. True B. False |
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| 19 | Question 37. Which one of the following does not exist? (i) XeOF4 (i) NeF2 (iii) XeF2 (iv) XeF. |
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| 20 | Ammonia is dried over: A. Quick lime B. Slaked lime c. Phosphorus pentoxide D. con. H ( _{2} mathrm{SO}_{4} ) |
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| 21 | Which of the following statements about anhydrous aluminium chloride is correct? A. It fumes in moist air. B. It exists as dimer both in the vapour state below ( 350^{circ} mathrm{C} ) and in non-polar solvents. C. It is prepared by heating ( A l_{2} O_{3} ) in a stream of sulphur chloride ( left(S_{2} C l_{2}right) ) vapour and chlorine. D. All of these. |
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| 22 | Which is called stranger gas? A. ( K r ) в. ( X e ) ( mathrm{c} . ) Не D. Ne |
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| 23 | Match the reactions of metals with dilute ( H N O_{3} ) (in column-I) with the nitrogen compounds (obtained by oxidation/reduction (in column-II). |
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| 24 | Which of the following compounds are formed by the reaction of ammonia with acids? This question has multiple correct options A. Calcium ammonium nitrate B. Ammonium chloride c. Ammonium phosphate D. Ammonium sulphate |
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| 25 | Consider the following transformations ( boldsymbol{I} cdot boldsymbol{X} boldsymbol{e} boldsymbol{F}_{6}+boldsymbol{N} boldsymbol{a} boldsymbol{F} longrightarrow boldsymbol{N} boldsymbol{a}^{+}left[boldsymbol{X} boldsymbol{e} boldsymbol{F}_{7}right]^{-} ) ( boldsymbol{I} boldsymbol{I} cdot boldsymbol{2} boldsymbol{P} boldsymbol{C l}_{5}(boldsymbol{s}) longrightarrowleft[boldsymbol{P} boldsymbol{C l}_{4}right]^{+}left[boldsymbol{P} boldsymbol{C l}_{6}right]^{-} ) ( boldsymbol{I I I} cdotleft[A lleft(H_{2} Oright)_{6}right]^{3+}+H_{2} O longrightarrow ) ( left[A lleft(H_{2} Oright)_{5} O Hright]^{2+}+H_{3} O^{+} ) Possible transformations are: A. ( I, I I, I I I ) В. ( I, I I I ) c. ( I, I I ) D. II, III |
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| 26 | Which of the following has seven valence electrons? A ( . N a^{+} ) в. ( A l ) ( c . F ) D. ( T i ) E. ( B ) |
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| 27 | Which of the following substance is stored under water: A. White phosphorus B. red phosphorus c. Sodium metal D. Both white phosphorous and red phosphorus |
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| 28 | Assertion ( A l(O H)_{3} ) is amphoteric in nature. Reason It cannot be used as an antacid. 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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| 29 | The molecular formula of ammonia is ( N H_{3} . ) Therefore, the number of hydrogen atoms in 34 g of ammonia will be: A. ( 3 times 6.023 times 10^{23} ) В. ( 6.023 times 10^{23} ) c. ( 34 times 6.023 times 10^{23} ) D. ( 6 times 6.023 times 10^{23} ) |
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| 30 | Formula of microcosmic salt is: A. ( N a_{2} H P O_{4} ) в. ( operatorname{Na}left(N H_{4}right) H P O_{4} ) ( mathbf{c} cdot K_{2} H P O_{4} ) D. ( N a_{2} P O_{4} . K_{2} P O_{4} ) |
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| 31 | ( [boldsymbol{X}]+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow[boldsymbol{Y}] ) a colourless gas with irritating burning smell of sulphur ( [boldsymbol{Y}]+boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7}+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow operatorname{green} ) solution. ( [boldsymbol{X}] ) and ( [boldsymbol{Y}] ) are: ( mathbf{A} cdot S O_{3}^{2-}, S O_{2} ) в. ( C l^{-}, H C l ) ( mathbf{c} cdot S^{2-}, H_{2} S ) D. ( C O_{3}^{2-}, C O_{2} ) |
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| 32 | a) Write the chemical equation to prepare sulphur dioxide from industrial method? b) What happens when ( S O_{2} ) is pass through water? c) Write reaction showing reducing property of sulphur dioxide? d) Draw a labeled diagram showing ring structure of rhombic sulphur? |
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| 33 | Which can do glass etching? ( mathbf{A} cdot H I O_{4} ) B. ( operatorname{SiF}_{4} ) c. ( H F ) D. ( H N O_{3} ) |
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| 34 | Oxygen is more electronegative than sulphur, yet ( H_{2} S ) is acidic while ( H_{2} O ) in neutral. This is because A. water is a highly associated compound B. ( H-S ) bond is weaker than ( H-O ) bond c. ( H_{2} S ) is a gas while ( H_{2} O ) is a liqiud D. the molecular weight of ( H_{2} S ) is more than that of ( H_{2} O ) |
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| 35 | ( boldsymbol{C a} boldsymbol{C O}_{3}+boldsymbol{S i O}_{2} rightarrow ) A ( cdot C a O+operatorname{Si} C O_{3} ) в. ( mathrm{CaSiO}_{3}+mathrm{SiO}_{2} ) c. ( C a S i O_{3}+C a O ) D. ( mathrm{CaSiO}_{3}+mathrm{CO}_{2} ) |
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| 36 | The element with highest boiling point in the following is : A. oxygen B. Sulphur c. Tellurium D. Polonium |
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| 37 | In the isolation of fluorine a number of difficulties were encountered.Which statements are incorrect: This question has multiple correct options A. Fluorine reacts with moist glass vessels B. Fluorine has great affinity for hydrogen C. Electrolysis of aqueous HF gives ozonized oxygen D. The potential required for the discharge of the fluoride ions lowest |
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| 38 | Nitrogen does not show pentacovalency because of: A. absence of s-orbitals B. absence of d-orbitals c. its small size D. none of these |
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| 39 | The hydrolysis of ( N C l_{3} ) by water molecules produces: A. ( N H_{2} O H+H O C l ) B. ( N H_{2} N H_{2}+H O ) c. ( N H_{4} O H+H O C l ) D. ( N H_{2} C l+H O C l ) |
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| 40 | Assertion Molecular nitrogen is less reactive than molecular oxygen. Reason The bond length of ( N_{2} ) is shorter than that of oxygen. 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 |
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| 41 | Which of the following is an anhydride of ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) A ( . H_{2} S ) в. ( H_{2} S_{2} ) ( c cdot S O_{2} ) ( mathrm{D} cdot mathrm{SO}_{3} ) |
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| 42 | The M.P. and B.P. are very low for? A. Ne в. не c. ( mathrm{kr} ) D. A |
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| 43 | With excess of ( C l_{2}, ) ammonia forms: A. ammonium chloride B. nitrogen trichloride c. nitrosyl chloride D. nitrogen |
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| 44 | Write the chemical reaction showing the bleaching action of chlorine. | 12 |
| 45 | Among ( boldsymbol{P b S}, boldsymbol{C u S}, boldsymbol{H} boldsymbol{g} boldsymbol{S}, boldsymbol{M n S}, boldsymbol{A} boldsymbol{g}_{2} boldsymbol{S}, boldsymbol{N i S} ) and ( operatorname{Sn} S_{2}, ) the total number of black coloured sulphides are: ( A cdot 6 ) B. 7 ( c cdot 8 ) D. |
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| 46 | Sulphur dioxide gas turns acidified potassium dichromate paper A . red B. green c. white D. yellow |
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| 47 | Write down the reaction when Ammonia reacts with atmospheric oxygen in the presence of catalyst. |
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| 48 | For the molecule ( boldsymbol{I} boldsymbol{F}_{7} ) (i) State the hybridisation of the central atom. (ii) State the geometry of the molecule. |
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| 49 | White phosphorus on reaction with NaOH gives ( P H_{3} ) as one of the products. This is a : A. dimerization reaction B. disproportionation reaction c. condensation reaction D. precipitation |
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| 50 | Identity the true statement regarding nitrates of all metals. A ( cdot ) All nitrates decompose to give ( N O_{2} ) B. All nitrates are soluble in water. C. All nitrates are insoluble in water D. All nitrates are stable to heatt |
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| 51 | Nitrate ion on reacting with conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) gives: A. nitrogen dioxide B. nitrogen pentaoxide ( c . ) nitrous oxide D. None of the above |
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| 52 | The bleaching agent in paper and textile industry: A . ( mathrm{NH}_{3} ) в. ( mathrm{H}_{2} mathrm{O}_{2} ) ( c cdot mathrm{sO}_{3} ) D. ( mathrm{Cl}_{2} ) |
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| 53 | Sodium hexametaphosphate is known as: A. Calgon B. Permutit c. Natalite D. Nitrolim |
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| 54 | Which of the following statements is (are) correct? This question has multiple correct options A. graphite is much less dense than diamond B. graphite is black and soft C . graphite has low melting point D. graphite feels smooth and slippery |
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| 55 | Phosphine is a reducing agent If true enter 1 , else enter 0 . |
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| 56 | When less amounts of oxygen is present, carbon combines with it to give gas. A. carbon dioxide B. carbon monoxide c. carbonate D. none of these |
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| 57 | Graphite is used for making electrodes and articles like writing pencils. It is made by heating coke with some silica for many hours in: A. a blast furnace B. a high electric furnace c. the presence of air D. a blast of steam under pressure |
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| 58 | Which element out of He, Ar, Kr and Xe forms least number of compounds? ( mathbf{A} cdot mathbf{K} ) B. xe c. Ar D. не |
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| 59 | In aqueous solution, ( left[boldsymbol{C o}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{2+}(boldsymbol{X}) ) reacts with molecular oxygen in the presence of excess liquor ( N H_{3} ) to give a new complex ( Y ). The number of unpaired electrons in ( X ) and ( Y ) are, respectively. A . 3,1 в. 3,0 c. 3,3 D. 7,0 |
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| 60 | ( boldsymbol{H}_{3} boldsymbol{B} boldsymbol{O}_{3} stackrel{boldsymbol{T}_{1}}{longrightarrow} boldsymbol{X} stackrel{boldsymbol{T}_{2}}{longrightarrow} boldsymbol{Y} stackrel{r e d h o t}{longrightarrow} boldsymbol{B}_{2} boldsymbol{O}_{3} ) ( T_{1}<T_{2} ) then ( X ) and ( Y ) respectively are : A. ( x= ) Metaboric acid and ( Y= ) Tetraboric acid B. X=Tetraboric acid and Y= Metaboric acid c. ( x= ) Borax and ( Y= ) Metaboric acid D. x=Tetraboric acid and Y= Borax |
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| 61 | Find number of ( p pi-d pi ) bonds in (a) Disulphate (b) triphosphate trimetaphosphate (d) trimer of ( S O_{3} ) ( (e) P_{4} O_{10} ) ( (f) P_{4} O_{6} ) |
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| 62 | The number of hydrogen atoms attached to phosphorus atom in hypophosphorous acid is : A. zero B. two c. one D. three |
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| 63 | In which of the following reactions, the oxidation state of nitrogen is not changed? A . Action of very dilute ( H N O_{3} ) on magnesium. B. Action of dilute ( H N O_{3} ) on zinc. c. Action of conc. ( H N O_{3} ) on copper. D. Action of very dilute ( H N O_{3} ) on zinc. |
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| 64 | In ( N O_{3}^{-} ) ion, the number of bond pair and lone pair of electrons on nitrogen atom is/are: A .2,2 B. 3, ( c cdot 1,3 ) D. 4,0 |
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| 65 | These questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose anyone of the following five responses. Assertion: Molecular nitrogen is less reactive than molecular oxygen. Reason: The bond length of ( N_{2}, ) is shorter than that of oxygen. 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 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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| 66 | State your observation when Conc. nitric acid is heated in absence of copper gives: A . yellow B. brown c. grey D. black |
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| 67 | (i) Why are interhalogen compounds more reactive than halogens? (ii) All the five bonds in ( P C l_{5} ) are not equivalent. Justify. |
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| 68 | During the manufacture of Chlorine by the electrolysis of brine, the by-products are : This question has multiple correct options ( mathbf{A} cdot mathbf{H}_{2} ) B. NaOH c. ( N a C l+mathrm{H}_{2} ) D. NaCl |
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| 69 | Which one of the following reacts with conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) A . Au B. Agg ( c cdot P t ) D. All |
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| 70 | Which oxide is insoluble in aqueous sodium hydroxide? A . Mgo в. ( A l_{2} O_{3} ) ( mathrm{c} cdot P_{4} O_{10} ) ( mathrm{D} cdot mathrm{SO}_{2} ) |
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| 71 | Which element has the highest valency with respect to oxygen? A. Sodium B. Aluminium c. chlorine D. Sulphur |
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| 72 | Which selection is the correct formula for the chlorate ion? A ( cdot C l^{-} ) B. ( C l O^{-} ) ( mathrm{c} cdot mathrm{ClO}_{2}^{-} ) D. ( C l O_{3}^{-} ) E ( cdot C l O_{4}^{-} ) |
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| 73 | The number of Oxygen atoms bonded to each silicon atom in silica crystal is : A B. 2 ( c cdot 3 ) ( D ) |
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| 74 | Which factor is most responsible for the increase in boiling points of noble gases from He to ( X e ? ) A . Decrease in ( I . E ) B. Monoatomic nature c. Decrease in polarisability D. Increase in polarisability |
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| 75 | Incorrect statement about Ge is: ( mathbf{A} cdot G e O_{2} ) is weakly acidic B. ( G e(O H)_{2} ) is amphoteric C ( cdot G e C l_{2} ) is more stable than ( G e C l_{4} ) D. ( G e-G e ) bond energy is lesser than that of ( S i-S i ) |
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| 76 | Structure of ( N_{2} O ) is similar to that of ( boldsymbol{C O}_{2} ) A. True B. False |
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| 77 | ( C S_{2} ) burns in excess air to produce : A. ( C O_{2} & S O_{2} ) в. ( C O_{2} & S O_{3} ) c. ( cos S O_{2} ) D. ( operatorname{co~} & mathrm{SO}_{3} ) |
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| 78 | When excess of ammonia is used: ( mathbf{3} C l_{2}+mathbf{8} N H_{3} longrightarrow A+B ) When excess of chlorine is used: ( mathbf{3} C l_{2}+mathbf{4} N H_{3} longrightarrow C+D ) The oxidation state of nitrogen in compound ( boldsymbol{A} ) is: A. -3 B. +3 ( c .+5 ) D. |
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| 79 | The product formed in the reaction of ( mathrm{SOCl}_{2} ) with white phosphorus is: A ( cdot P C l_{3} ) в. ( S O_{2} C l_{2} ) ( c cdot S C l_{2} ) D. ( P O C l_{3} ) |
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| 80 | ( mathrm{XeF}_{2} ) has ( _{-}-ldots_{-} ) geometry A. linear B. tetrahedral c. coplanar D. octahedral |
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| 81 | Match the species in in ( C ) olumn ( I ) with their corresponding properties in Column II |
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| 82 | What happens when white phosphorus is heated with caustic soda? Which of the following are possible products? This question has multiple correct options ( mathbf{A} cdot mathbf{P H}_{3} ) В. РН ( _{5} ) ( mathrm{c} cdot mathrm{NaH}_{2} mathrm{PO}_{2} ) D. ( mathrm{NaH}_{4} mathrm{PO}_{2} ) |
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| 83 | Which of the following has 0-0 linkage: A ( cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{6} ) в. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{8} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{3} ) D. ( mathrm{H}_{2} mathrm{S}_{4} mathrm{O}_{6} ) |
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| 84 | In the Contact process, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a twostep procedure is used. The equations for the two steps involved are: ( boldsymbol{S} boldsymbol{O}_{boldsymbol{x}}+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{boldsymbol{y}} ) ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{7}+boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{2} boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) Find the value of ( x ) and ( y: ) A. ( x=2, y=5 ) в. ( x=3, y=5 ) c. ( x=2, y=7 ) D. ( x=3, y=7 ) |
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| 85 | Which gas cannot collected over water? A. ( O_{2} ) в. ( P H_{3} ) c. ( N_{2} ) D. ( S O_{2} ) |
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| 86 | The structure formula of hypophosphorous acid is: ( A ) в. ( c ) D. |
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| 87 | An atom has ( 2 K, 8 L ) and ( 5 M ) electrons. Choose the correct statement(s) regarding it. A. Trivalent anion of this atom will have 12 protons in its nucleus. B. Trivalent cation of this atom will have six p-electrons in it. C. This atom form an amphoteric oxide of formula ( X_{2} O_{3} ) D. One of its allotrope is tetra atomic ( left(X_{4}right) ) A. ( A ) and ( B ) B. ( B ) only c. ( B ) and ( C ) D. ( B ) and ( D ) |
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| 88 | Why is ( N_{2} ) less reactive at room temperature? |
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| 89 | Concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) cannot be used to prepare HBr or HI from KBr or KI because it A. reacts too slowly with KBr or KI B. reduces HBr or H c. oxidises KBror KI D. oxidises KBr to ( K B r O_{3} ) or ( K ) I to ( K I O_{3} ) |
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| 90 | Which is more easily reduced: Ca or O? ( mathbf{A} cdot mathbf{C a} ) ( B . O ) C . Both are equally reduced D. None of the above |
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| 91 | ( F e^{3+} ) oxidises ( N H_{2} O H ) to A ( cdot N O_{2} ) в. ( N_{2} ), c. ( N_{2} ) D. ( N_{3} ) |
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| 92 | Ammonia is highly soluble in water. Other gases showing similar solubility is/are : A. hydrochloric gas B. sulphur dioxide gas c. chlorine D. both A and B |
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| 93 | Which of the following is a normal salt: A. ( mathrm{NaH}_{2} mathrm{PO}_{2} ) в. ( mathrm{NaH}_{2} mathrm{PO}_{3} ) ( mathbf{c} cdot mathrm{NaH}_{2} mathrm{PO}_{4} ) D. ( mathrm{Na}_{3} mathrm{PO}_{4} ) |
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| 94 | How many of the following substances are soluble in concentrated ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) ? ( boldsymbol{B} boldsymbol{a} boldsymbol{S} boldsymbol{O}_{4}, boldsymbol{C} boldsymbol{u} boldsymbol{S}, boldsymbol{P b} boldsymbol{S}, boldsymbol{H} boldsymbol{g} boldsymbol{S} ) ( A ) B. 2 ( c cdot 3 ) D. 4 |
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| 95 | ( mathrm{CO}_{2} ) is gas, while ( mathrm{SiO}_{2} ) is solid because: ( mathbf{A} cdot C O_{2} ) is a linear molecule, while ( S i O_{2} ) is angular. B. van der Waals’ forces are very strong in ( S i O_{2} ) ( mathrm{C} cdot mathrm{CO}_{2} ) is covalent, while ( mathrm{SiO}_{2} ) is ionic. D. ( S i ) cannot form stable bonds with ( O ), hence ( S i ) has to form a ( 3 D ) lattice |
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| 96 | One method of producing ( N H_{3} ) is by heating ammonium chloride, ( N H_{4} C l ) with ( C a O ) ( mathbf{2} N boldsymbol{H}_{4} boldsymbol{C l}+boldsymbol{C a O} rightarrow mathbf{2} boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{C a} boldsymbol{C l}_{2}+ ) ( boldsymbol{H}_{2} boldsymbol{O} ) Explain why the reaction of ( N H_{4} C l ) with ( C a O ) produces ammonia. |
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| 97 | The correct statement among the following is: ( mathbf{A} cdotleft(S i H_{3}right)_{3} N ) is pyramidal and more basic than ( left(C H_{3}right)_{3} N ) B. ( left(operatorname{Si} H_{3}right)_{3} N ) is planar and more basic than ( left(C H_{3}right)_{3} N ) C ( cdotleft(S i H_{3}right)_{3} N ) is pyramidal and less basic than ( left(C H_{3}right)_{3} N ) D. ( left(S i H_{3}right)_{3} N ) is planar and less basic than ( left(C H_{3}right)_{3} N ) |
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| 98 | In the raction ( S O_{2}+2 H_{2} S rightarrow 3 S+ ) ( 2 H_{2} O, ) the substance that is oxidized is ( A cdot S O_{2} ) в. ( H_{2} ) О ( c cdot s ) D. ( H_{2} S_{S} ) |
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| 99 | Study the figure given below and answer the questions that follow: Name another gas which has the same property and can be demonstrated through this experiment. |
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| 100 | Phosphine is prepared by the action of? A . Pand ( H_{2} S O_{4} ) B. P and NaOH c. P and ( H_{2} S ) D. P and ( H N O_{3} ) |
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| 101 | Which gas is essential constituent of almost all fuel gases? A. ( C O_{2} ) в. ( N_{2} ) ( c cdot c o ) D. ( H_{2} O ) |
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| 102 | Bleaching action of ( S O_{2} ) is due to: A. reduction B. Oxidation c. hydrolysis D. None of the above |
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| 103 | Which of the following is incorrect about ( boldsymbol{H}_{mathbf{4}} boldsymbol{P}_{mathbf{2}} boldsymbol{O}_{mathbf{5}} ) ? A. It contains ( P ) in +5 oxidation state B. It is dibasic acid c. It is strongly reducing in nature D. It contains one ( P-O-P ) bond |
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| 104 | Which one of the following is paramagnetic in nature? A . ( N O ) в. ( N_{2} ), c. ( N_{2} O_{5} ) D. All of the above |
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| 105 | Assertion Nitrous oxide is also known as laughing gas Reason It is a colourless gas having a faint sweet odour 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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| 106 | Assertion Each N-atom is ( s p^{3}- ) hybridised in ( N_{2} H_{4} ) Reason It has gauche conformation Read the above assertion and reason and choose the correct statement regarding it. 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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| 107 | Assertion Nitric oxide, though an odd electron molecule in diamagnetic in liquid state Reason There occurs only partial dimerisation |
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| 108 | Complete the following reaction: ( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{O}_{3} longrightarrow ? ) |
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| 109 | The synonym for water gas when used in the production of methanol is: A. natural gas B. laughing gas c. syn gas D. fuel gas |
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| 110 | Which of the following has least tendency of catenation? A. ( C ) B. ( S ) i c. ( G e ) D. ( S n ) |
11 |
| 111 | Which of the following are peroxoacids of sulphur? ( mathbf{A} cdot H_{2} S O_{5} ) and ( H_{2} S_{2} O_{8} ) ( mathbf{B} cdot H_{2} S O_{5} ) and ( H_{2} S_{2} O_{7} ) ( mathbf{c} cdot H_{2} S_{2} O_{7} ) and ( H_{2} S_{2} O_{8} ) D. ( H_{2} S_{2} O_{6} ) and ( H_{2} S O_{5} ) |
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| 112 | Which of the following element occurs in free form in nature? A. ( N ) в. ( P ) c. ( A s ) D. ( S b ) |
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| 113 | Which of the following is true for ( N_{2} O_{5} ) ? A. Paramagnetic B. Anhydride of ( H N O_{2} ) c. Brown gas D. Exist in solid In form of ( left[N O_{2}^{+}right]left[N O_{3}^{-}right] ) |
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| 114 | Which substance could not be used as a fuel to heat water in a boiler? A. ethanol B. hydrogen c. methane D. oxygen |
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| 115 | Question 15. Why is H2O a liquid and H2S a gas? Discuss different intermolecular interactions as these interations are stronger in liquid as compared to a gas, natiuitabe of 35) od |
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| 116 | While preparing oxygen from potassium permanganate, the hard glass test tube must be held steady A. True B. False |
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| 117 | What is the correct formula for dinitrogen monoxide? A ( cdot N_{2} O ) в. ( N_{2} O_{5} ) c. ( N_{4} O_{2} ) D. ( N O ) E. ( N O_{2} ) |
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| 118 | The acid used in lead storage cell is: A. Phosphoric acid B. Nitric acid c. Sulphuric acid D. Hydrochloric acid |
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| 119 | Oleum on hydrolysis gives sulphuric acid. A . True B. False |
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| 120 | Dry chlorine is not collected over mercury because: A. of formation of mercuric chloride B. of formation of amalgams c. it is soluble in mercury D. it is heavier than mercury |
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| 121 | Explain the following: Concentrated nitric acid appears yellow when it is left standing in a glass bottle. |
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| 122 | A powerful oxidant in the list given below is : A. ( H N O_{2} ) в. ( H N O_{3} ) ( mathrm{c} cdot mathrm{H}_{3} mathrm{PO}_{4} ) D. ( H_{3} P O_{3} ) |
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| 123 | Name the compound of chlorine 1 which is an anesthetic 2 . which is used as a refrigerant 3. which is a disinfectant 4. which is used to make pipes and tubes 5. which liberates chlorine on exposure to air. |
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| 124 | Which of the following gas mixture is used by the divers inside the sea? A. ( O_{2}+H e+N_{2} ) B. ( O_{2}+X e ) ( mathbf{c} cdot O_{2}+A r+N_{2} ) D. ( O_{2}+N_{2} ) |
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| 125 | Both ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{3} ) and ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) are dibasic acid. But, equimolar solutions of both acids do not contain equal concentration of ( boldsymbol{H}^{+} ) ions. Give reason. |
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| 126 | Some of the substances used in making of a modern safety match box are listed below:- a) Antimony trisulphide b) Glass powder c)Potassium chlorate d) Red phosphorous The head of a modern safety match stick contains: A. A and D B. B and C ( c cdot c ) and ( D ) D. c and A |
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| 127 | Assertion Some farmers feel that lightning helps produce better crop. Reason Lighting forms No which is converted to ( N o_{2}, H N O_{2} ) and ( H N O_{3} ) under atomospheric condition. Thus, ( N O_{3}^{-} ) is a source of nutrients (fertilisers) to the plant. Thus there are chances of better crops when lightning occurs. Read the above assertion and reason and choose the correct option regarding |
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| 128 | Which of the following oxides dissolves in water to form a strongly acidic solution? ( mathbf{A} cdot N a_{2} O ) в. ( C a O ) c. ( A l_{2} O_{3} ) D. ZnO E. ( S O_{3} ) |
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| 129 | Addition of nitric acid to acidified FeSO serves as a test for the former gives: A. ferrous sulphate solution (brown black) B. ferrous sulphate solution (brown) c. ferrous sulphate solution (black) D. ferrous sulphate solution (green) |
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| 130 | Write most favourable conditions for the conversion of ( S O_{2} ) into ( S O_{3} ) |
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| 131 | SU2 15 U 100 Question 22. How is the presence of SO, detected? toetat detect the resence of |
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| 132 | Which oxide of nitrogen is obtained on heating ammonium nitrate at ( 250^{circ} mathrm{C} ) ? A. Nitric oxide B. Nitrous oxide c. Nitrogen dioxide D. Dinitrogen tetraoxide |
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| 133 | The valency of noble gases is generally: A . zero B. one c. three D. two |
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| 134 | Liquids flow from a higher to a lower level. Which liquid can climb up the walls of the glass vessel in which it is kept? A. Liquid helium B. Alcohol c. water D. Liquid nitrogen |
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| 135 | A colourless gas ‘ ( x ) ‘ forms a brown coloured gas ‘ ( y^{prime} ) when mixed with air. ( x ) and ( y ) could be : A. ( N O, N O_{2} ) в. ( N O, O_{2} ) c. ( N O_{2}, N_{2} O_{4} ) D. ( N O, N_{2} O_{4} ) |
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| 136 | Which of the following pairs is the most acidic? ( A cdot N_{2} O_{5}, P_{2} O_{3} ) B. ( mathrm{N}_{2} mathrm{O}_{5}, mathrm{P}_{2} mathrm{O}_{5} ) ( mathbf{c} cdot mathbf{H}_{3} mathbf{P} mathbf{O}_{4}, mathbf{H}_{3} mathbf{P} mathbf{O}_{3} ) D. None of the above |
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| 137 | Which of the following belongs to the halogen family? A. Francium B. Polonium c. Radium D. Astatine |
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| 138 | How does ozone react with the following (i) ( P b S ) (ii) ( boldsymbol{K} boldsymbol{I} ) (iii) ( C_{2} H_{4} ) (iv) ( N O ) |
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| 139 | Sulfur dioxide can be anhydride for which of the following? A. Sulfurous acid B. Hyposulfurous acid c. Sulfuric acid D. Hydrosulfuric acid |
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| 140 | Arrange the following in the increasing order of bond energy: ( boldsymbol{F}_{2}<boldsymbol{C l}_{2}<boldsymbol{O}_{2}< ) ( N_{2} ) If true enter 1 , else enter 0 . |
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| 141 | Which of the follwoing statements is correct? A. ( mathrm{HCl} ) is covalent both in aqueous solution and in the gaseous state B. HCl is covalent in the gaseous state but ionic in aqueous solution C. ( mathrm{HCl} ) is ionic both in the gaseous state and in aqueous solution D. None of the above |
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| 142 | The liquefied metal expanding on solidification is : A . Ga в. А। ( c cdot z n ) D. c |
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| 143 | When ( S O_{2} ) gas is passed into aqueous ( N a_{2} C O_{3} ) the product(s) formed is (are): A ( . ) NaHSO ( _{4} ) B. ( N a_{2} S O_{4} ) ( mathbf{c} cdot operatorname{NaH} S O_{3} ) D. ( N a_{2} S O_{3} ) and ( N a H S O_{3} ) E. ( N a H S O_{4} ) and ( N a_{2} S O_{4} ) |
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| 144 | Which of the following statement is/are correct? This question has multiple correct options A. Phosphoric acid is transparent solid. B. Phosphoric acid melts as ( 44^{circ} mathrm{C} ). C. Phosphoric acid absorbs water. D. Phosphoric acid forms coloured syrupy mass. |
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| 145 | The oxidation states of iodine in ( H I O_{4}, H_{2} I O_{5} ) and ( H_{5} I O_{6} ) are respectively A. +1,+3,+7 B. +7,+7,+3 ( c cdot+7,+7,+7 ) ( D cdot+7,+5,+3 ) |
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| 146 | Question 21. Comment on the nature of two S-O bonds formed in SO, molecule. Are the two S-O bonds in this molecule equal? |
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| 147 | The Group VA element that makes up part of bones and teeth is: A. B. c. As D. sb |
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| 148 | Amongst the following compounds (I) ( boldsymbol{H}_{5} boldsymbol{P}_{3} boldsymbol{O}_{10},(text { II }) boldsymbol{H}_{6} boldsymbol{P}_{4} boldsymbol{O}_{13},(| text { II }) boldsymbol{H}_{5} boldsymbol{P}_{5} boldsymbol{O}_{15} ) and ( (mathrm{IV}) boldsymbol{H}_{7} boldsymbol{P}_{5} boldsymbol{O}_{16}, ) the non-cyclic phosphates are: A. I and III B. I, II and III c. ।, ॥ and IV D. I, II, II and IV |
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| 149 | One mole of calcium phosphide on reaction with an excess of water gives: A. one mole of phosphine B. two moles of phosphoric acid c. two moles of phosphine D. one mole of phosphorous oxide |
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| 150 | Which one of the following is an amphoteric oxide? ( A cdot S O_{2} ) в. ( B_{2} O_{3} ) ( c cdot Z n O ) D. ( N a_{2} O ) |
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| 151 | Assertion Nitrogen turns red litmus paper blue. Reason Ammonia is a basic gas. 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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| 152 | I. Oxidizing agents must include oxygen. II. Oxygen is a good electron acceptor. A. Statement ( I ) is true, statement ( I I ) is true and is a correct explanation of the phenomena described in ( I ) B. Statement I is true, statement II is false c. statement I is false, statement ( I I ) is true D. Statement I is false, Statement ( I I ) is false |
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| 153 | 42. Dry bleach is done by (1) Ozone (2) Hydrogen peroxide (3) Sulphur dioxide (4) Chlorine |
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| 154 | Nitrogen dioxide is released by heating- ( mathbf{A} cdot P bleft(N O_{3}right)_{2} ) в. ( K N O_{3} ) c. ( N a N O_{2} ) D. ( N H_{4} N O_{3} ) |
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| 155 | The highest concentration of was found in Hartley coal ash. A. Leadd B. Germanium c. Antimony D. carbon |
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| 156 | Oxygen gas is a Supporter of combustion and keeps the burning splinter glowing. A. True B. False |
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| 157 | Animals breathe, oxygen and give out A. Carbon dioxide B. Oxygen c. Nitrogen D. Hydrogen |
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| 158 | ( 4 P+5 O_{2} rightarrow ) A. POS B. 2P205 ( c cdot 4 P O 4 ) D. 2P305 |
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| 159 | Which of the following displaces ( B r_{2} ) from an aquenous solution containing bromide ions? A ( cdot C l ) в. ( C l_{2} ) ( c cdot I_{3}^{-} ) D. ( I_{2} ) |
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| 160 | Which of the following is chemical formula of Oleum? ( A cdot H_{2} S_{2} O_{8} ) в. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{5} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{4} ) D. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{7} ) |
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| 161 | When ( C l_{2} ) gas is dissolved in water, there is disproportion to ( H C l O ) and ( boldsymbol{H} boldsymbol{C l} ) A. True B. False |
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| 162 | From the two allotropes of sulphur, Rhombic sulphur and Monoclinic sulphur, which is more stable? A. Rhombic B. Monoclinic c. Both are equally stable D. None |
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| 163 | Which one of the following oxy acid of fluorine exists? ( mathbf{A} cdot H O F ) в. ( H F O_{3} ) c. ( H F O_{4} ) D. ( H F O_{2} ) |
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| 164 | When molten sulphur is quenched, then which of the following is formed? A. Monoclinic sulphur B. Rhombic sulphur c. crystex (plastic) D. Gamma sulphur |
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| 165 | ( mathrm{O}_{2} ) is denser than air and ( mathrm{so} ), it is collected over: ( A cdot H_{2} O ) B. spirit c. ( H g ) D. kerosene oi |
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| 166 | Why is ( K O_{2} ) paramagnetic? | 12 |
| 167 | 7. The black part of a pencil is made of …………… |
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| 168 | The correct order for acid strength is: ( mathbf{A} cdot A l_{2} O_{3}<S i O_{2}<P_{2} O_{3}<S O_{2} ) B. ( S i O_{2}<S O_{2}<A l_{2} O_{3}<P_{2} O_{3} ) ( mathbf{c} cdot A l_{2} O_{3}<S i O_{2}<S O_{2}<P_{2} O_{3} ) D. ( S O_{2}<P_{2} O_{3}<S i O_{2}<A l_{2} O_{3} ) |
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| 169 | For the industrial preparation of nitric acid from ammonia, when ammonia is heated with excess air in presence of a catalyst, at ( 900^{circ} mathrm{C}, mathrm{NO} ) is obtained. Which line of entry describes the undefined reagents, products and reaction conditions? A . catalyst at room temperaure ( left(25^{circ} mathrm{C}right) ) and ( mathrm{NO}_{2} ) B. catalyst at room temperature ( left(25^{circ} mathrm{C}right) ) and ( N_{2} mathrm{O} ) C. catalyst hight pressure and ( N O_{2} ) D. catalyst hight pressure and ( N_{2} O_{3} ) |
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| 170 | Which of the following group 14 elements shows maximum tendency towards catenation? A. Iead B. germanium c. silicon D. carbon |
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| 171 | Which one among the following can be classified as amphoteric? A. ( N a_{3} P O_{4} ) в. нс c. маОН D. ( H S O_{4}^{-} ) E ( cdot C_{2} O_{4}^{2} ) |
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| 172 | ( N H_{3} ) can enter into complex formation due to: A. hydrogen bonding B. coordinate bond c. covalent bond D. ionic bond |
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| 173 | Assertion ( P_{4} ) exists but ( N_{4} ) does not; ( N_{2} ) exists but ( P_{2} ) does not Reason white phosphorus : ( boldsymbol{P}_{4} boldsymbol{N} equiv ) ( N 946 k J m o l^{-1}, P equiv ) ( boldsymbol{P} mathbf{4 8 1} boldsymbol{k} boldsymbol{J} boldsymbol{m o l}^{-1}, boldsymbol{N}- ) ( N 160 k J m o l^{-1}, P-P 215 k J m o l^{-1} ) Greater the B.E., greater the stability [compare BE of ( N equiv N ) and ( N-N ) (in ( left.left.N_{4}right) text { and } P-Pleft(text { in } P_{4}right)right] ) Read the above assertion and reason and choose the correct option regarding ¡t. 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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| 174 | Fill in the blanks. Nitrogen is not a supporter of |
12 |
| 175 | Q. 31 Which of the following statements are correct. Among halogens, radius ratio between iodine and fluorine is maximum. (b) Leaving F – F bond, all halogens have weaker X – X bond than X-X’ bond in interhalogens. (c) Among interhalogen compounds maximum number of atoms are present in iodine fluoride. (d) Interhalogen compounds are more reactive than halogen compounds. |
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| 176 | The amorphous form of silica is: A. Quartz B. Kieselguhr c. Cristobalite D. Tridymite |
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| 177 | Which compound is solid? A. ( C O_{2} ) в. ( N H_{3} ) ( mathrm{c} cdot P H_{3} ) D. ( operatorname{si} 0_{2} ) |
11 |
| 178 | A metal ( X ) when burnt in air, ( X ) -forms oxide and nitride both. ( X ) can be: ( mathbf{A} cdot R b ) в. ( M g ) ( c . N a ) D. ( K ) |
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| 179 | Which of the following is correct? A. lodine is solid B. Chlorine is insoluble in water. C. lodine is more reactive than bromine. D. Bromine is more reactive than chlorine. |
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| 180 | ( mathbf{2} N_{2}+O_{2} longrightarrow ) A ( cdot N_{2} O ) в. ( N O_{2} ) c. ( N O ) D. ( N_{2} O_{2} ) |
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| 181 | In aluminate ion, the coordination number of aluminium is: ( A cdot 2 ) B. 4 ( c cdot 6 ) ( D ) |
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| 182 | Which of the following halides cannot be hydrolyzed? (I) ( boldsymbol{T} boldsymbol{e} boldsymbol{F}_{6},(|) boldsymbol{S} boldsymbol{F}_{6} ) (III) ( N C l_{3}, ) and ( (I V) ) ( N F_{3} ) ( mathbf{A} cdot|| ) and ( I mathbf{V} ) B. I, II and III c. ।, ॥ and IV D. II and IV |
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| 183 | Assertion Chlorine reacts with freshly prepared calcium hydroxide to produce bleaching powder. Reason Chlorine has a great affinity for hydrogen. 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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| 184 | Assertion Sulphuric acid reacts with sodium chloride in the following way: ( 2 mathrm{NaCl}+boldsymbol{H}_{2} boldsymbol{S O}_{4} rightarrow 2 mathrm{HCl}+boldsymbol{N} boldsymbol{a}_{2} boldsymbol{S O}_{4} ) Reason Sulphuric acid because of its low volatility can be used to manufacture more volatile acids from their corresponding salts. 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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| 185 | The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is: A. pyrosulphurous acid B. hyposulphurous acid c. pyrosulphuric acid D. persulphuric acid |
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| 186 | Which of the followings is/are correct? This question has multiple correct options A. In the structure of ( I F_{2}^{+} ) bond angle is smaller than the tetrahedral angle because of lone pair-lone pair repulsion B. In the structure of ( I F_{4}^{+} ), there is ( s p^{3} ) hybridisation with bond angle of ( 109^{circ} 28^{prime} ) C. In the structure of ( I F_{6}^{+} ), there are six bonding electrons and no lone pairs D. In the structure of ( I F_{4}^{+} ), two F-atoms one at equatorial positions and two are inclined at an angle less than ( 120^{circ} ) due to lone pair-bond pair repulsion |
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| 187 | Marshall’s acid is: ( mathbf{A} cdot H_{2} S O_{5} ) ( mathbf{B} cdot H_{2} S_{2} O_{7} ) ( mathbf{c} cdot H_{2} S_{2} O_{3} ) D. ( H_{2} S_{2} O_{8} ) |
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| 188 | ( N H_{3} ) has much higher boiling point than ( P H_{3} ) because: A. ( N H_{3} ) has much higher molecular mass B. ( N H_{3} ) forms hydrogen bonds c. ( N H_{3} ) contains ionic bonds while ( P H_{3} ) contains covalent bonds D. ( N H_{3} ) undergoes umbrella inversion. |
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| 189 | Which is wrong about ( boldsymbol{O}_{3} ) A. It is paramagnetic in nature B. It has a linear structure c. It decolourizes acidic ( K M n O_{4} ) D. All |
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| 190 | To a piece of charcoal sulfuric acid is added. Then A. there is no reaction B. water gas is formed ( mathrm{c} cdot mathrm{SO}_{2} ) and ( mathrm{CO}_{2} ) are evolved D. ( C O ) and ( S O_{2} ) are evolved |
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| 191 | ( C N^{-} ) and ( N_{2} ) are isoelectronic. But in contrast to ( C N^{-}, N_{2} ) is chemically inert because of: A. smaller ( N-N ) bond energy B. I arger ( N-N ) bond energy c. low inoziation enthalpy D. none of these |
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| 192 | White phosphorous is more reactive due to: A. bond angle strain B. its polymeric nature c. both of them D. less density |
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| 193 | Among ( boldsymbol{C a} boldsymbol{C l}_{2}, boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) and ( boldsymbol{C a O}, ) which compound can be used for the drying of ammonia gas? Why? |
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| 194 | Concentrated nitric acid is converted to sulphuric acid by the reaction with: A. Sulphur dioxide B. conc.sulphuric acid c. sulphur D. Sulphur trioxide |
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| 195 | The correct order of stability of the halous acids in aqueous solution is: A. ( mathrm{HClO}<mathrm{HBrO}mathrm{HBrO}mathrm{HBrO}> ) HlO D. HClO HlO |
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| 196 | What happens when ortho phosphoric acid is heated to ( 600^{circ} mathrm{C} ) ? A. Phosphorus is formed B. Phosphorus acid is formed c. Hydrogen gas is released D. Phosphorus pentaoxide is formed |
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| 197 | Kjeldahl’s method cannot be used for: This question has multiple correct options A ( . P h N O_{2} ) в. ( P h N H C O P h ) c. Azobenzene D. Pyridine |
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| 198 | Find the number of nitrates which gives ( N O_{2} ) gas on heating from the following: Nitrogen dioxide is released on heating: ( N H_{4} N O_{3}, K N O_{3}, N a N O_{2}, P bleft(N O_{3}right)_{2} ) |
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| 199 | Consider the following statements regarding halides of ( boldsymbol{S} ) (i) ( S F_{4} ) and ( S C l_{4} ) act as Lewis acid only. (ii) ( S F_{4} ) and ( S C l_{4} ) act as Lewis base only. (iii) ( S F_{4} ) and ( S C l_{4} ) act both as Lewis acid and Lewis base. The correct option is: A. both (ii) a (iii) are correct B. both (i) a (ii) are correct c. only (iii) is correct D. all are correct |
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| 200 | Which are the correct statements for ( N O_{2} ? ) This question has multiple correct options A. It is paramagnetic and dimerizes to ( N_{2} O_{4} ) B. ( N_{2} O_{4} ) is planar and diamagnetic. ( mathrm{C} cdot mathrm{N} mathrm{O}_{2} ) is linear containing an odd number of electrons. D. N-O bonds in ( N O_{2} ) are different lengths. |
12 |
| 201 | Chlorine was discovered by: A. Priestley B. Davy c. shceele D. Cavendish |
12 |
| 202 | In which one of the following compounds does sulphur have the least oxidation number? ( A cdot S O_{2} ) в. ( mathrm{H}_{2} mathrm{SO}_{4} ) ( mathrm{c} cdot mathrm{Na}_{2} mathrm{S}_{2} mathrm{O}_{3} ) D. ( mathrm{Na}_{2} mathrm{S}_{4} mathrm{O}_{6} ) |
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| 203 | Which of the following oxides of nitrogen is anhydride of nitric acid? A ( cdot mathrm{N}_{2} mathrm{O}_{3} ) B. ( N_{2} O_{4} ) ( mathbf{c} cdot mathbf{N}_{2} mathbf{O}_{mathbf{5}} ) ( D cdot N_{2} O ) |
12 |
| 204 | Q.36 Match the species given in Column I with the properties mentioned in Column II. A. B. C. D. Column BF AICI; Sno PbO Column II 1. Oxidation state of central atom is +4 2. Strong oxidising agent 13. Lewis acid 4. Can be further oxidised 5. Tetrahedral shape |
11 |
| 205 | Gases ( X ) and ( Y ) are respectively: A. ( C l_{2}, I_{2} ) в. ( H C l, I_{2} ) c. ( H C l, H I ) D. ( H C l O, I_{2} ) |
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| 206 | Which one of the following group 16 elements does not exist in -2 oxidation state? A . ( S ) в. ( S e ) ( c cdot O ) D. ( P o ) E . ( T e ) |
12 |
| 207 | Q7. Give reason why boron and aluminium tend to form covalent compounds. 11 |
11 |
| 208 | Q. 17 On heating ammonium dichromate and barium azide separately we get (a) N2 in both cases (b) N, with ammonium dichromate and NO with barium azide (c) N, O with ammonium dichromate and N, with barium azide (d) N, O with ammonium dichromate and NO, with barium azide minim dichromate and harium azide it produces N as senarately |
12 |
| 209 | 0.29 Which of the following options are not in accordance with the property mentioned against them? (a) F, > Cl2 > Br2 > I Oxidising power (b) MI > MBT > MCI > MF lonic character of metal halide (C) F > CI, > Br, >1, Bond dissociation enthalpy (d) HI < HBr <HCI <HF Hydrogen-halogen bond strength |
12 |
| 210 | Equivalent weight of ( S O_{2} ) is found to be 32 in a reaction taking place in acidic medium. This reaction is represented as ( boldsymbol{S O}_{2}+mathbf{2 H}_{2} boldsymbol{O} rightarrow boldsymbol{S} boldsymbol{O}_{4}^{2-}+boldsymbol{4} boldsymbol{H}^{+}+ ) ( mathbf{2} e^{-} ) State whether the given reaction take place in backward direction or forward direction? |
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| 211 | Assertion: ( mathbf{P}_{4} ) is more reactive than ( mathbf{N}_{2} ) Reason: ( mathbf{P}-mathbf{P} ) bonds are relatively weaker than ( mathbf{N}-mathbf{N} ) 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 |
12 |
| 212 | Which of the following arrangement of bond dissociation enthalpy of halogens is correct? A. ( F-F>C l-C l>B r-B r ) В. ( F-F<C l-C lC l-C l<B r-B r ) D. ( F-FB r-B r ) |
12 |
| 213 | Ammonia forms the complexion ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) with copper ions in the alkaline solution because: A. in acidic solutions, protons coordinate with ammonia molecules B. in acidic solutions, hydration protects copper ions. c. in alkaline solutions, insoluble ( C u(O H)_{2} ) is precipitated which is soluble in excess of any alkali D. copper hydroxide is an atmospheric substance. |
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| 214 | Which halogen has the highest value of negative electron gain enthalpy? A. Fluorine B. Chlorine c. Bromine D. lodine |
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| 215 | The two types of bonds present in ( B_{2} H_{6} ) are covalent and ionic bond. If true enter 1, else enter 0 |
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| 216 | Q Type your question- ( (boldsymbol{C}) stackrel{bullet}{longrightarrow}(boldsymbol{A})+(boldsymbol{D}) ) conc. solution of ( (C) frac{operatorname{conc.H}_{2} S O_{4}}{(E)} ) (weak acid) ( (D)+ ) cobalt oxide ( stackrel{Delta}{longrightarrow}(F) ) (coloured bead) ( (boldsymbol{E})+boldsymbol{C}_{2} boldsymbol{H}_{5} boldsymbol{O} boldsymbol{H} stackrel{boldsymbol{Delta}}{longrightarrow} ) green edged flame ( (G) ) ( A ) to ( G ) based on the following reactions are: ( mathbf{A}: boldsymbol{N} boldsymbol{a} boldsymbol{B} boldsymbol{O}_{2} ) ( mathbf{B}: boldsymbol{C O}_{mathbf{2}} ) ( mathbf{C}: boldsymbol{N} boldsymbol{a}_{2} boldsymbol{B}_{4} boldsymbol{O}_{7} ) ( mathrm{D}: B_{2} O_{3} ) E: ( boldsymbol{H}_{3} boldsymbol{B} boldsymbol{O}_{3} ) ( mathrm{F}: boldsymbol{C o}left(boldsymbol{B O}_{2}right)_{2} ) ( mathrm{G}:left(C_{2} H_{5} Oright)_{3} B ) If the statement is true enter 1 , else enter 0 |
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| 217 | ( N H_{4}^{+} ) is iso structural with: A ( cdot P C l_{3} ) в. ( C H_{4} ) ( mathrm{c} cdot B F_{3} ) D. ( N O_{3} ) |
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| 218 | Assertion Graphite cannot be converted into diamond. Reason Graphite is conducting in nature. 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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| 219 | How many ( S-S ) linkage(s) is/are present in sodium tetrathionate? ( A cdot 4 ) B. 3 ( c cdot 2 ) D. |
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| 220 | ( B F_{3} ) dimerizes to form stable molecule. Enter 1 if true else enter 0 |
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| 221 | Find the number of ( S-S ) linkage in ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{3} ) |
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| 222 | Which of the following pentahalides does not exist? A. PF ( _{5} ) B. ( mathrm{PCl}_{5} ) c. ( mathrm{PBr}_{5} ) D. PI |
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| 223 | Which of the following halide of nitrogen is stable in nature? A. ( N F_{3} ) в. ( N C l_{3} ) c. ( N B r_{3} ) D. ( N I_{3} ) |
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| 224 | Give reasons of the following: ( N_{2} O_{5} ) is more acidic than ( N_{2} O_{3} ) |
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| 225 | lonisation energy of ( O_{2} ) to ( O^{+} ) O2is very similar to the ionization energy of ( X e ) to ( boldsymbol{X} boldsymbol{e}^{+} ) A. True B. False |
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| 226 | Which of the following is not the application of nitrogen? A. Refrigerant B. Metallurgy c. Match sticks D. Electric bulbs |
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| 227 | Assertion Both ( S O_{2} ) and ( S O_{3} ) are reducing agents Reason Both ( S O_{2} ) and ( S O_{3} ) bleach the articles |
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| 228 | When ether is exposed to air for sometime an explosive substance produced is: A. peroxide B. oxide c. тNT D. superoxide |
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| 229 | Complete the following reaction: ( N a N O_{3}+N H_{4} C l longrightarrow ? ) ( mathbf{A} cdot N a N O_{3}+N H_{4} C l longrightarrow N H_{4} N O_{3}+N a C l stackrel{Delta}{rightarrow} N_{2} O+ ) ( 2 H_{2} O ) B ( cdot N a N O_{3}+3 N H_{4} C l longrightarrow 2 N H_{4} N O_{3}+N a C l triangleq N_{2} O+ ) ( 2 H_{2} O ) ( mathbf{c} cdot 2 N a N O_{3}+3 N H_{4} C l longrightarrow 2 N H_{4} N O_{3}+2 N a C l triangleq ) ( N_{2} O+2 H_{2} O ) D. None of these |
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| 230 | Which of the following is paramagnetic in nature? A. ( N_{2} O_{4} ) в. ( N_{2} ) ( c cdot N O_{2} ) D. ( N_{2} O_{5} ) |
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| 231 | nud Suppery. Q26. (a) Classify following oxides as neutral, acidic, basic or amphoteric CO,B,O,, SiO,, CO,, A1 O2, PbO2, T1,03. (b) Write suitable equations to show their nature. Cocopie TI . Amphetoric_AL |
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| 232 | On heating coal with conc. Sulphuric acid, we get : A. ( S O_{3} ) в. ( C O_{2} ) and ( S O_{2} ) ( c cdot N_{2} ) D. ( C O_{2} ) |
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| 233 | The oxides of nitrogen which show neither acidic nor basic properties are : A. ( N O, N_{2} O_{3} ) B. ( N_{2} O, N O ) c. ( N O, N_{2} O_{4} ) D. ( N_{2} O, N_{2} O_{4} ) |
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| 234 | In the following reaction [ begin{array}{c} boldsymbol{X} boldsymbol{e} boldsymbol{F}_{2}+boldsymbol{B} boldsymbol{r} boldsymbol{O}_{3}^{-}+boldsymbol{H}_{2} boldsymbol{O} longrightarrow boldsymbol{X} boldsymbol{e}+ \ boldsymbol{B r} boldsymbol{O}_{4}^{-}+mathbf{2} boldsymbol{H} boldsymbol{F} end{array} ] equivalent mass of ( B r O_{3}^{-}= ) molar mass |
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| 235 | When chlorine water is added to a solution of ( K B r, ) the solution immediately turns orange red, because A. Chlorine is reduced to chloride ion B. of the formation of ( B r C l ) c. Bromide ion is oxidized to bromine D. of the formation of ( B r_{3} ) |
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| 236 | Phosphorus trichloride reacts with phosphorus acid to give pyrophosphoric acid. A. True B. False |
12 |
| 237 | What is the basicity of orthophosphorus acid? A. one B. Two c. Three D. Four |
12 |
| 238 | Which of the following statement is wrong? This question has multiple correct options A. The stability of hydride increases from ( mathrm{NH}_{3} ) to ( mathrm{BiH}_{3} ) in group 15 of the periodic table. B. Nitrogen cannot form ( mathrm{d} pi-mathrm{p} pi ) bond. C. single ( mathrm{N}-mathrm{N} ) bond is weaker than the single P-P bond. D. ( mathrm{N}_{2} mathrm{O}_{4} ) has two resonance structures. |
12 |
| 239 | Give chemical equations to manufacture of Sulphuric Acid by Contact process. |
12 |
| 240 | Mercury in the presence of ozone is oxidised to mercuric oxide. If the given statement is true enter 1 else enter 0 |
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| 241 | a Stable electronic contigurationis, 0.25 In solid state PCL5 is a ………. (a) covalent solid (b) octahedral structure (c) ionic solid with [PCI.] octahedral and [PCIAT tetrahedral (d) ionic solid with [ PCL IT tetrahedral and [PCIoctahedral |
12 |
| 242 | Give the reaction of dichlorine gas with cold and dilute and hot and concentrated ( N a O H_{(a q)} ) |
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| 243 | Anhydride of nitrous acid is: в. ( N O ) c. ( N_{2} O_{3} ) D. ( N_{2} O_{4} ) |
12 |
| 244 | Which of the following is not a chalcogen? A. ( O ) B. ( S ) ( c . S e ) D. ( P ) |
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| 245 | The percentage of p-character in the orbitals forming P-PP-P is: A . 25 B. 33 ( c .50 ) D. 75 |
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| 246 | How many number of faces are there in ( P_{4} ) molecule? |
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| 247 | Borax is not used? A. as a styptic to stop bleeding B. in making enamel and pottery glazes C . as a flux in soldering D. in making optical glasses. |
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| 248 | Match list 1 and list 2 . List – List A) ( C O+H_{2} ) 1. Producer gas B) ( C O+N_{2} ) 2. Semi water gas C) ( boldsymbol{C O}+boldsymbol{H}_{2}+boldsymbol{N}_{2} ) 3. Water gas D) ( boldsymbol{H}_{2}+boldsymbol{C} boldsymbol{H}_{4}+boldsymbol{C O} ) 4. Coal gas ( A cdot 1342 ) B. 2 4 13 ( c .3124 ) D. 1432 |
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| 249 | The following acids have been arranged in the order of decreasing acid strength. Identify the correct orderCIOH(I) ( quad ) BrOH(II) ( quad mid O H(| I) ) B. ॥>1>111 ( c cdot|mid>|>1 ) |
12 |
| 250 | The facts that are true among the following are: This question has multiple correct options |
12 |
| 251 | [ boldsymbol{X} boldsymbol{e} boldsymbol{F}_{6} stackrel{text {Complete } boldsymbol{H} boldsymbol{y} text {drolysis}}{boldsymbol{P}}+ ] other product [ begin{array}{l} downarrow boldsymbol{O H}^{-} / boldsymbol{H}_{2} boldsymbol{O} \ boldsymbol{Q} \ downarrow end{array} ] slow disproportionation in ( O H^{-} / H_{2} O ) Products Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is: A . 0 B. 1 ( c cdot 2 ) D. 3 |
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| 252 | Fill in the blanks. Boiling point of nitrogen |
12 |
| 253 | Q10. What is producer gas? | 11 |
| 254 | The reaction of Xe with an excess of ( mathbf{F}_{2} ) at high pressure and 573 K yields: A. ( mathrm{XeF}_{2} ) в. ( mathrm{xeF}_{4} ) c. ( mathrm{xeF}_{6} ) D. XeF ( _{3} ) |
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| 255 | Quicklime is not used to dry ( H C l ) gas because ( _{—}-_{-}(C a O ) is alkaline ( mathrm{CaO} ) is acidic, ( mathrm{CaO} ) is neutral | 12 |
| 256 | Which of the following can be oxidized by ( boldsymbol{S O}_{2} ) ( mathbf{A} cdot M g ) в. ( K_{2} C r_{2} O_{7} ) ( mathbf{c} cdot K M n O_{4} ) D. All |
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| 257 | What would be the effect on burning if the proportions of nitrogen and oxygen in air were reversed? A. The atmosphere would be explosive B. Oxygen reacting with the nitrogen to form poisonous nitrous oxides c. The digestion of protein would be affected D. All of the above |
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| 258 | ( boldsymbol{S} boldsymbol{O}_{2} ) reduces ( boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}^{-} ) to ( boldsymbol{M} boldsymbol{n}^{2+} . ) Number of electrons involved in the reduction of ( M n O_{4}^{-} ) to ( M n^{2+} ) is : |
12 |
| 259 | Write the equation for the formation of ammonia by the action of water on magnesium nitride. A ( cdot 2 M g_{3} N_{2}+6 H_{2} O rightarrow 2 N H_{3}+6 M g(O H)_{2} ) В ( cdot M g_{3} N_{2}+3 H_{2} O rightarrow N H_{3}+3 M g(O H)_{2} ) ( mathrm{c} cdot_{3 M g_{3} N_{2}+6 H_{2}} O rightarrow 6 N H_{3}+3 M g(O H)_{2} ) D. ( M g_{3} N_{2}+6 H_{2} O rightarrow 2 N H_{3}+3 M g(O H)_{2} ) |
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| 260 | Which of the following statement(s) is/are correct when a mixture of ( N a C l ) and ( K_{2} C r_{2} O_{7} ) is gently warmed with conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) This question has multiple correct options A. A deep red vapor is evolved. B. The vapor when passed into NaOH solution gives yellow solution of ( N a_{2} C r O_{4} ) c. chlorine gas is evolved. D. chromyl chloride is formed. |
12 |
| 261 | Which among the following is a paramagnetic compound? A ( cdot N_{2} O ) B. ( N O ) ( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{3} ) D. ( N_{2} O_{4} ) |
12 |
| 262 | Q38. If the starting material for the manufacture of silicons is RSiCl,, write the structure of the product formed. 1211 |
11 |
| 263 | How does ammonia react with solution of Cu? |
12 |
| 264 | Which of the following bonds has the highest energy? A. Se-Se в. Te-Te c. s-s D. 0-0 |
12 |
| 265 | Which of the following equations indicates the oxidizing property of ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) A. ( H_{2} S O_{4} rightarrow S O_{3}+H_{2} O ) B. ( H_{2} S O_{4} rightarrow H_{2} S O_{3}+H_{2} O ) c. ( H_{2} S O_{4} rightarrow S O_{2}+H_{2} O+[O] ) D. ( H_{2} S O_{4} rightarrow S O_{3}+2[H] ) |
12 |
| 266 | How does Ozone react with the following? (i) ( P b S ) (ii) ( C_{2} H_{4} ) (iii) ( boldsymbol{A} boldsymbol{g} ) (iv) ( boldsymbol{H} boldsymbol{g} ) |
12 |
| 267 | Chemically inert halide of sulphur is: A ( cdot S C l_{2} ) в. ( S F_{2} ) c. ( S F_{4} ) D. ( S F_{6} ) |
12 |
| 268 | Which of the following order of acidic strength is correct? A. ( H C l O>H C l O_{2}>H C l O_{3}>H C l O_{4} ) в. ( H C l O_{4}>H C l O_{2}>H C l O_{3}>H C l O ) с. ( H C l O_{2}>H C l O>H C l O_{4}>H C l O_{3} ) D. ( H C l O_{4}>H C l O_{3}>H C l O_{2}>H C l O ) |
12 |
| 269 | Which of the following oxides are not neutral? This question has multiple correct options A. ( C O ) B. ( S n O_{2} ) ( c cdot Z n O ) D. ( operatorname{si} O_{2} ) |
12 |
| 270 | Ammonia acts as a: A . reducing agent B. oxidising agent C . bleaching agent D. both ( A ) and ( c ) |
12 |
| 271 | Peroxonitrous acid is an unstable intermediate formed in the oxidation of ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{2} ) by ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) “Peroxonitrous acid has the same formula as nitric acid, ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) Answer whether the above statement is true or false.lf true enter 1 , else 0 |
12 |
| 272 | Among these ores the highest phosphorus content is in : A. chlorapatite. B. phosphorite c. fluorspar. D. equal |
12 |
| 273 | Phosphine is not obtained, when: A. red phosphorous us heated with ( N a O H ) B. white phosphorous is heated with ( N a O H ) C ( cdot C a_{3} P_{2} ) reacts with water D. phosphorous trioxide is boiled with water |
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| 274 | ( H_{3} B O_{3} ) is a: A. monobasic acid and weak Lewis acid B. monobasic acid and weak Bronsted acid C. monobasic acid and strong Lewis acid D. tribasic acid and weak Bronsted acid |
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| 275 | Which reaction is more spontaneous theoretically? A . ( I ) B. II c. Both equally D. Can’t be predicted |
12 |
| 276 | Which of the following statements are correct statement(s) about pyrophosphoric acid ( left(boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7}right) ) ? This question has multiple correct options A. It contains P in +5 oxidation state B. It is dibasic acid c. It is a reducing agent D. It contains one P-O-P bond |
12 |
| 277 | The correct order of pseudohalide,polyhalide and interhalogen are ( mathbf{A} cdot B r I_{2}^{-}, O C N^{-}, I F_{5} ) B ( cdot I F_{5} cdot B r I_{2}^{-}, O C N^{-} ) ( mathbf{c} cdot O C N^{-}, I F_{5}, B r I_{2}^{-} ) D. ( O C N^{-}, B r I_{2}^{-}, I F_{5} ) |
12 |
| 278 | Which one of the following pentafluorides cannot be formed? A. ( P F_{5} ) B. ( A s F_{5} ) ( mathrm{c} . S b F_{5} ) D. ( B i F_{5} ) |
11 |
| 279 | Which is the lightest gas? A. Helium B. Oxygen c. Hydrogen D. Nitrogen |
12 |
| 280 | Strongest reducing agent of the following is : ( A cdot H_{2} O ) в. ( mathrm{H}_{2} mathrm{s} ) c. ( mathrm{H}_{2} mathrm{Se} ) D. ( mathrm{H}_{2} mathrm{Te} ) |
12 |
| 281 | Anhydrous borax is: ( mathbf{A} cdot N a_{2} B_{4} O_{7} ) B. ( N a_{2} B_{4} O_{7} .5 H_{2} O ) ( mathbf{c} cdot N a_{2} B_{4} O_{7} cdot 10 H_{2} O ) D. ( N a_{2} B_{4} O_{7} .8 H_{2} O ) |
11 |
| 282 | ( ln P C l_{5}, ) how many ( (C l-P-C l) ) are inclined at ( 120^{circ} ) with one each : |
12 |
| 283 | Dry ( S O_{2} ) does not bleach dry flowers because: A. nascent hydrogen responsible for bleaching is produced only in presence of moisture B. water is the actual reducing agent responsible for bleaching C. water is_stronger acid than ( S O_{2} ) D. the ( O H^{-} ) ions produced by water cause bleaching |
12 |
| 284 | When white phosphorus is heated at ( 473 mathrm{K} ) under high pressure, what will happen? A. ( alpha ) – Black phosphorus is formed B. ( beta ) -Black phosphorus is formed c. Red phosphorus is formed. D. No change would be observed |
12 |
| 285 | 3 Y ULUSPICIOUS Ans. Ammonia (NH) on catalytic oxidation by atmospheric oxygen in presence of Rh/Pt gauge at 500K under pressure of 9 bar produces nitrous oxide. Balanced chemical reaction can be written as Pt/Rh gauge catalyst 4NH3 + 502 500 K 9 bar From air bereid |
12 |
| 286 | White phosphorus on reaction with NaOH gives ( P H_{3} ) as one of the products. This is a? A. Dimerisation reaction B. Disproportionation reaction c. condensation reaction D. Precipitation reaction |
12 |
| 287 | Oxygen exhibits its +ve oxidation states in its: A. Fluorides B. Chlorides C. Nitrides D. Sulphides |
12 |
| 288 | Which of the following statements regarding sulphur dioxide is not true? ( A cdot S O_{2} ) is an angular molecule B. ( S O_{2} ) may be regarded as the resonance hybrid of two canonical structures ( mathrm{C} cdot S mathrm{O}_{2} ) is an anhydride of sulphuric acid D. ( S O_{2} ) is an anhydride of sulphurous acid |
12 |
| 289 | An orange solid ( (X) ) on heating, gives a colourless gas (Y) and a only green residue (Z). Gas (Y) on treatment with Mg, produceds a white solid substance A. ( M g_{3} N_{2} ) 2 в. ( M g O ) c. ( M g_{2} O_{3} ) D. ( M g C l_{2} ) |
12 |
| 290 | The lightest noble gas atom contains the following particles in its nucleus: A. 4 protons B. 3 neutrons c. 3 protons and 1 neutron D. 2 protons and 2 neutrons |
12 |
| 291 | Oxides which show both acidic and basic nature are called as oxides. |
12 |
| 292 | Nitric acid is yellow in colour when: A. freshly prepared B. dissolved oxides of nitrogen are present c. water is dissolved D. None of the above |
12 |
| 293 | The inert gas which cannot be adsorbed over activated coconut charcoal? A . Ne B. Ar c. не D. ( mathrm{Kr} ) |
12 |
| 294 | Draw the structure of the molecule ( C l F_{3} ) and state its geometry. |
12 |
| 295 | Write the name and structure of any five oxyacids of sulphur? |
12 |
| 296 | Name the gas in each of the following: The gas produced on reaction of dilute sulphuric acid with a metallic sulphide |
12 |
| 297 | Photochemical among is due to the presence of : A. Oxides of sulphur B. Oxides of nitrogen c. Oxides of carbon D. Lead |
12 |
| 298 | What is the structure of phosphorus trichloride? A. Trigonal Pyramidal B. Trigonal Planar c. Tetrahedral D. Square Planar |
12 |
| 299 | Q24. How would you explain the lower atomic radius of Ga as compared to Al? Co the electrons in gallium experi |
11 |
| 300 | The yellow colour of ( H N O_{3} ) is due to the dissolution of nitrogen dioxide ( left(N O_{2}right) ) A. True B. False |
12 |
| 301 | A greenish yellow gas of halogen family turns moist blue litmus paper red. A. True B. False |
12 |
| 302 | Oleum is: A. castor oil B. oil of vitriol C. fuming sulphuric acid D. none of these |
12 |
| 303 | Q. 12 Which of the following elements does not show allotropy: (a) Nitrogen (b) Bismuth (c) Antimony (d) Arsenic Ans (a) Nitrogen done not nhau and Therefore abilit |
12 |
| 304 | Assertion (A): The basic nature of VA group hy-drides decreases from ammonia to bismuthine. Reason (R): Availability of lone pair on the cen-tral atom in hydrides decreases down the group. A. Both (A) and (R) are true and (R) is the correct explanation of (A) B. Both (A) and (R) are true and (R) is not the correct explanation of (A) ( c . ) (A) is true and (R) is false D. (A) is false but (R) is true |
12 |
| 305 | Three reactions involving ( mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-} ) are given below: (i) ( mathbf{H}_{3} mathbf{P} mathbf{O}_{4}+mathbf{H}_{2} mathbf{O} rightarrow mathbf{H}_{3} mathbf{O}^{+}+mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-} ) (ii) ( mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-}+mathbf{H}_{2} mathbf{O} rightarrow mathbf{H} mathbf{P} mathbf{O}_{4}^{2-}+mathbf{H}_{3} mathbf{O}^{+} ) (iii) ( mathbf{H}_{2} mathbf{P O}_{4}^{-}+mathbf{O H}^{-} rightarrow mathbf{H}_{3} mathbf{P} mathbf{O}_{4}+mathbf{O}^{2-} ) In which of the above reactions, does ( H_{2} P O_{4}^{-} ) act as an acid? A . (ii) only B. (i) and (ii) ( c . ) (iii) only D. (i) and (iii) |
12 |
| 306 | – 6 Расу о песьма Q18. How is excessive content of Co, responsible for global warming? |
11 |
| 307 | Which one of the following reactions of xenon compounds is not feasible? A ( cdot 3 X e F_{4}+6 H_{2} O longrightarrow 2 X e+X e O_{3}+12 H F+1.5 O_{2} ) B . ( 2 X e F_{2}+2 H_{2} O rightarrow 2 X e+4 H F+O_{2} ) ( mathbf{c} cdot_{X e F_{6}+R b F} rightarrow R bleft[X e F_{7}right] ) D. ( X e O_{3}+6 H F rightarrow X e F_{6}+3 H_{2} O ) |
12 |
| 308 | Give reasons why a paper written in ordinary ink is bleached by chlorine whereas it cannot bleach printed ink. |
12 |
| 309 | Municipality officials use chlorine in water purification because: A. chlorine cleans water B. chlorine helps water to cool easily c. chlorine coagulates mud particles D. chlorine kills harmful bacteria |
12 |
| 310 | a) Write a chemical equation to prepare ammonia from ammonium chloride? b) Write a chemical equation to identify ( C u^{+2} & A g^{+} ) ions with the application of ( N H_{3} ? ) c) Draw a labeled diagram showing flowchart for the manufacture of ammonia? |
12 |
| 311 | Straight chain silicones are prepared by hydrolysis by: A ( cdot R_{2} S i C l_{2} ) в. ( R_{3} ) SiCl c. ( R S i C l_{3} ) D. ( R_{2} ) Si |
11 |
| 312 | 4. The oxidation number of sulphur in S, S,FHS respectively are: (a) 0, +1 and 2 (b) +2, +1 and -2 (c) 0, +1 and +2 (d) -2, +1 and -2 |
12 |
| 313 | On hydrolysis of interhalogen compound,oxyhalide ion is formed from: A. larger halogen B. smaller hallogen c. both the halogens D. more electronegative halogen |
12 |
| 314 | Gas ( A ) is formed on the hydrolysis of calcium cyanamide. The gas can turn moist litmus paper blue and forms a brown precipitate with Nessler’s reagent. The gas, ( boldsymbol{A} ) is: A ( cdot N_{2} ) B. NO ( c cdot N O_{2} ) D. ( N H_{3} ) |
12 |
| 315 | Sulphuryl chloride ( left(boldsymbol{S} boldsymbol{O}_{2} boldsymbol{C l}_{2}right) ) reacts with white phosphorus ( left(P_{4}right) ) to give: A. ( P C l_{5}, S O_{2} ) в. ( O P C l_{3}, S O C l_{2} ) c. ( P C l_{5}, S O_{2}, S_{2} C l_{2} ) D. ( O P C l_{3}, S O_{2}, S_{2} C l_{2} ) |
12 |
| 316 | Fill in the blanks by choosing the appropriate word/words from those given in the brackets: (square pyramidal, electrical, 74, 26, ( s p^{3} d^{2}, s p^{3} d, ) chemical, 68,32 tetrahedral, yellow, white, iodoform, Lucas) The shape of ( X e O F_{4} ) molecule is and the hybridisation of xenon atom in the molecule is |
12 |
| 317 | When potassium magnate is treated with ozone, the compound obtained as product is: ( mathbf{A} cdot K M n O_{4} ) в. ( M n O_{2} ) c. ( M n O_{4} ) D. all of these |
12 |
| 318 | aqueous ( N a O H+P_{4}(w h i t e) longrightarrow ) ( boldsymbol{P H}_{3}+boldsymbol{X} . ) Compound ( mathbf{X} ) is: A. ( N a H_{2} P O_{2} ) в. ( N a_{2} H P O_{4} ) c. ( N a_{2} C O_{3} ) D. ( operatorname{NaH} mathrm{CO}_{3} ) |
12 |
| 319 | Among the following compounds, the one which does NOT produce nitrogen gas upon heating is? A ( cdotleft(N H_{4}right)_{2} C r_{2} O_{7} ) в. ( operatorname{NaN}_{3} ) ( mathbf{c} cdot N H_{4} N O_{2} ) D. ( left(N H_{4}right)_{2}left(C_{2} O_{4}right) ) |
12 |
| 320 | ( boldsymbol{S} boldsymbol{O}_{2} ) behaves as a reducing agent when : A. Passed over hot ( C u O ) B. Mixed with moist ( H_{2} S ) c. Passes through acidified ( K M n O_{4} ) solution D. Passed through ( F e S O_{4} ) solution. |
12 |
| 321 | The most acidic is: A. ( A s_{2} O_{3} ) в. ( P_{2} O_{3} ) ( mathrm{c} cdot mathrm{Sb}_{2} mathrm{O}_{3} ) D. ( B i_{2} O_{3} ) |
12 |
| 322 | Which of the following statements are true about quartz? A. it is pure crystalline form of silica. B. it is a tetrahedral polymer of ( boldsymbol{S} boldsymbol{i} boldsymbol{O}_{boldsymbol{2}} ) C. UV light can pass through quartz A. A and B are correct B. B and C are correct c. A and C are correct D. all are correct |
11 |
| 323 | Explain why interhalogen compounds are more reactive than their constituent elements? |
12 |
| 324 | Which of the following is weakest lewis acid? A ( cdot B C l_{3} ) в. ( A l C l_{3} ) ( mathbf{c} cdot G a C l_{3} ) D. ( operatorname{InCl}_{3} ) |
11 |
| 325 | Why do noble gases have comparatively large atomic sizes? |
12 |
| 326 | Yellow oils of sulphur is/are: A ( . H_{2} S ) в. ( H_{2} S_{2} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{4} ) D. ( C S_{2}, N H_{2} C S N H_{2} ) |
12 |
| 327 | Q12. Explain the difference in properties of diamond and graphite on the basis of their structures. Since diamond ich hodin n : the hardest onhstance Ang |
11 |
| 328 | The most acidic oxide among the following is: A. ( C l_{2} O_{5} ) в. ( C l_{2} O ) ( mathbf{c} cdot C l_{2} O_{3} ) D. ( C l_{2} O_{7} ) |
12 |
| 329 | State True or False. Bleaching action of ( S O_{2} ) is due to reduction and it is temporary. A. True B. False |
12 |
| 330 | Starting with elemental phosphorus, ( boldsymbol{P}_{4} ) phosphoric acid can be prepared as shown ( boldsymbol{P}_{4}(s)+mathbf{5} O_{2}(boldsymbol{g}) longrightarrow boldsymbol{P}_{4} boldsymbol{O}_{10}(s) stackrel{boldsymbol{H}_{2} O}{longrightarrow} ) ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) A. True B. False |
12 |
| 331 | Xenon fluoride act as fluoride acceptor with : A. ( R b F ) в. ( C s F ) c. Both (A) and (B) D. None of these |
12 |
| 332 | Assertion ( N O_{2} ) is reddish brown and its dimer ( N_{2} O_{4} ) is colourless Reason There is a dative bond formation between two ( N O_{2} ) molecules. A. Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion B. Both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion c. Assertion is CORRECT, but reason is INCORRECT D. Assertion is INCORRECT, but reason is CORRECT |
12 |
| 333 | Kieselguhr contains: A. carbon B. silicon c. boron D. iodine |
11 |
| 334 | The weakest ( C l-O ) bond is found in : A. ( C l O_{4}^{-} ) B. ( C l O_{2}^{-} ) c. ( C l O^{-} ) D. ( C l O_{3}^{-} ) |
12 |
| 335 | Atomicity of white or yellow phosphorus is 4 and it is represented as ( P_{4} ) molecule,calculate the value of expression ( frac{x cdot y}{z} ) regarding this molecule. Where ( x: ) Total number of vertex angles in ( P_{4} ) molecule y: Total number of lone pairs in ( P_{4} ) molecule z: Total number of P- – -P bonds in ( P_{4} ) molecule |
12 |
| 336 | 10. Which of the following is gas to room temperature? (a) Water (b) Carbon dioxide (c) Dryice (d) Nitrogen |
11 |
| 337 | The explosive compound of ( N_{2} ) is: A. ( N_{2} O_{5} ) в. ( N H_{3} ) c. ( N F_{3} ) D. ( N C l_{3} ) |
12 |
| 338 | (a) Complete the following chemical equations: (i) ( underset{(text {hot and conc.})}{N a O H}+C l_{2} rightarrow ) (ii) ( boldsymbol{X}_{e} boldsymbol{F}_{4}+boldsymbol{O}_{2} boldsymbol{F}_{2} rightarrow ) (b) Draw the structures of the following molecules: (i) ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2} ) (ii) ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{7} ) (iii) ( boldsymbol{X} boldsymbol{e} boldsymbol{O} boldsymbol{F}_{4} ) |
12 |
| 339 | In which of the following, the double bond consists of both ( p i ) bond? ( A cdot O_{2} ) в. ( C_{2} ) c. ( B e_{2} ) D. ( S_{2} ) |
12 |
| 340 | Consider the following compounds. ( (i) I C I(i i) I B r(i i i) I C I_{3}(i v) S F_{4} ) ( (v) B r F_{3}(v i) I F_{3}(v i i) B r F_{5}(v i i i) I F_{7} ) Calculate the value of ( left[frac{boldsymbol{P}^{2}-boldsymbol{Q}^{2}}{boldsymbol{R}+boldsymbol{S}}right] ) Here, ( boldsymbol{P}: ) Total number of polar compounds ( Q: ) Total number of planar compounds ( R: ) Total number of non polar compounds ( boldsymbol{S}: ) Total number of non planar compounds A. 6 B. 7 ( c cdot 4 ) D. |
12 |
| 341 | Oxygen can be prepared by heating A. potassium permanganate B. methane c. carbon D. none of these |
12 |
| 342 | Explain two properties of carbon: (i) Catenation (ii) Tetravalency |
11 |
| 343 | Which of the following are basic oxides? ( M n_{2} O_{7}, V_{2} O_{3}, V_{2} O_{5}, C r_{2} O_{3}, C r O ) A. ( M n_{2} O_{7} ) and ( V_{2} O_{3} ) B. ( V_{2} O_{3} ) and ( C r O ) c. ( C r O ) and ( C r_{2} O_{3} ) D. ( V_{2} O_{5} ) and ( V_{2} O_{3} ) |
12 |
| 344 | Tin reacts with concentrated ( H N O_{3} ) to give: A. stannic nitrate B. stannous nitrate c. metastanic acid D. none of these |
12 |
| 345 | How many allotropes do sulphur have? A .4 B. 20 ( c cdot>20 ) D. 10 |
12 |
| 346 | Which of the following xenon compounds may not be obtained by hydrolysis of xenon fluorides? A. ( X e O_{2} F_{2} ) в. ( X e O F_{4} ) ( mathbf{c} cdot X e O_{3} ) D. ( X e O_{4} ) |
12 |
| 347 | Write the name and structure of any five oxy acids of phosphorus? |
12 |
| 348 | When sulphur is reacted with ozone in water,the product formed is: A ( . H_{2} ) в. ( H_{2} S O_{3} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{4} ) D. ( H_{2} S_{2} O_{8} ) |
12 |
| 349 | 29. Which of the following ele. ments is obtained from se weeds ? (1) Iodine (2) Vanadium (3) Argon (4) Sulphur |
12 |
| 350 | What is the basicity of orthophosphorous acid? A. one B. Two c. Three D. Four |
12 |
| 351 | White phosphorus reacts with caustic soda. The products are ( P H_{3} ) and ( N a H_{2} P O_{2} . ) This reaction is an example of A. oxidation B. reduction c. neutralization D. disproportionation |
12 |
| 352 | When chlorine water is exposed to sunlight ( O_{2} ) is liberated. Hence: A. hydrogen has little affinity to ( O_{2} ) B. hydrogen has more affinity to ( O_{2} ) C. hydrogen has more affinity to ( C l_{2} ) D. it is a reducing agent |
12 |
| 353 | Sulphur combines with oxygen in the ratio 2: 3 to form the oxides of sulphur Find the formula of its oxide. |
12 |
| 354 | Which of the following compounds do not exist? ( N_{4}, P_{4}, P C I_{5}, N C I_{5}, P_{2} O_{5}, N O_{2}, P O_{2} ) A. ( N_{4}, N C I_{5}, N O_{2} ) B. ( N_{4}, N C I_{5}, P O_{2} ) c. ( P C I_{5}, N C I_{5}, P O_{2} ) D. All of these |
12 |
| 355 | (a) Draw the structures of the following molecules: (i) ( N_{2} O_{5} ) (ii) ( boldsymbol{H} boldsymbol{C l O}_{4} ) (b) Explain the following observations: (i) ( H_{2} S ) is more acidic than ( H_{2} O ) (ii) Fluorine does not exhibit any positive oxidation state. (iii) Helium forms no real chemical compound. |
12 |
| 356 | Give the balanced reaction for the manufacture of the ammonia gas. A. ( 3 N_{2}+3 H_{2} rightarrow 6 N H_{3} ) в. ( N_{2}+3 H_{2} rightarrow 2 N H_{3} ) c. ( N_{2}+3 H_{2} rightarrow N H_{3} ) D. ( N_{2}+6 H_{2} rightarrow 4 N H_{3} ) |
12 |
| 357 | Which of the following will not be oxidised by ( mathrm{O}_{3} ? ) A . KI в. ( mathrm{FeSO}_{4} ) ( c cdot ) кмпО D. ( mathrm{K}_{2} mathrm{Mn} mathrm{O}_{4} ) |
12 |
| 358 | Among ( V_{2} O_{5} ) and ( P t, ) which is a better catalyst for formation of ( S O_{3} ) from ( S O_{2} ) by contact process? Why? |
12 |
| 359 | Nitrogen is a poisonous gas because animals die in their presence why? | 12 |
| 360 | The shape of ( C l F_{3} ) molecule is: A . tetrahedral в. T shape c. linear D. trigonal |
12 |
| 361 | Which of the following equations is not shown by the appropriate halogen? ( mathbf{A} cdot F_{2}+2 O H^{-} )solution( rightarrow 2 F^{-}+H_{2} O+O F_{2} ) B ( cdot 2 F_{2}+4 O H^{-} ) conc ( stackrel{text {hot}}{longrightarrow} 4 F^{-}+2 H_{2} O+O_{2} ) ( mathbf{c} cdot X_{2}+2 O H^{-} operatorname{conc} stackrel{text {hot}}{longrightarrow} H_{2} O+X^{-}+X O^{-} ) where ( X ) is ( mathrm{Cl} ) Br and ( mathbf{D} cdot X e F_{4} ) |
12 |
| 362 | 11. 2.84 g of P,019 is dissolved in 1 L aqueous solution. Thus, (a) resulting solution is 0.01 M (b) it is neutralized to Na PO, by 400 mL of 0.3 M NaOH (c) it is neutralized to CaHPO, by 400 mL of 0.1 M Ca(OH), (d) it cannot be neutralized by basic solution |
11 |
| 363 | Which have a giant covalent structure? This question has multiple correct options A. Diamond в. ( operatorname{si} O_{2} ) c. ( operatorname{sicl}_{4} ) ( D cdot C O_{2} ) |
11 |
| 364 | Assertion Conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) as a drying agent. Reason HCl prepared from NaCl is dried by passing through conc.sulphuric acid. 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 |
12 |
| 365 | Elements with atomic numbers 9,17,35 53 are collectively known as: A. chalcogens B. halogens c. lanthanides D. rare gases |
12 |
| 366 | When conc. ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) is heated, it decomposes to give- A. ( O_{2} ) and ( N_{2} ) B. NO c. ( N_{2} O_{5} ) D. ( N O_{2} ) and ( O_{2} ) |
12 |
| 367 | Which oxide does not act as a reducing agent? This question has multiple correct options A . ( N O ) в. ( N O_{2} ) ( mathrm{c} cdot mathrm{N}_{2} mathrm{O} ) D. ( N_{2} O_{5} ) |
12 |
| 368 | Which is the anhydride of orthosilicic acid? ( A cdot s i ) B. Sio ( mathrm{c} cdot operatorname{si0}_{2} ) D. ( operatorname{si} 0_{3} ) |
11 |
| 369 | “Aqua regia” is a combination of : A. ( H C l ) and ( H_{2} S O_{4} ) B. ( H C l ) and ( H N O_{3} ) c. ( H C l ) and ( H B r ) D. HCl and ( H F ) |
12 |
| 370 | The basicity is high for : A. Phosphorus acid B. Metaphosphoric acid c. ortho phosphoric acid D. Hypo phosphorus acid |
12 |
| 371 | Assertion ( boldsymbol{P C l}_{5} ) and ( boldsymbol{P C l}_{4} ) are thermally unstable Reason They produce same gas on thermal decomposition 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 |
12 |
| 372 | es Question 1. Why are pentahalides more covalent than trihalides? Covalent character increases with increase in oxidation state. |
12 |
| 373 | H ( C l ) gas can fume in moist air A. True B. False |
12 |
| 374 | How are interhalogen compounds formed? What general compositions can be assigned to them? | 12 |
| 375 | ( mid=H e ) ( |=N e quad| I=A r quad I V=K r ) Decreasing order of melting point of compound I-IV follows: B. |> || > || > > IV c. ॥> ||| > |V>1 D. II>IV>III>1 |
12 |
| 376 | HCOOH reacts with conc. ( H_{2} S O_{4} ) to produce A. ( c o ) в. ( C O_{2} ) c. No D. ( N O_{2} ) |
12 |
| 377 | How many following oxyacids have peroxy linkage? ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{3}, boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{8}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{5}, boldsymbol{H} boldsymbol{l} boldsymbol{l} ) | 12 |
| 378 | When conc. ( H_{2} S O_{4} ) is added to hydrated copper [ll] sulphate: A. white crystals is changed to black powder as water is removed. B. brown crystals is changed to black powder as water is removed. c. black crystals is changed to white powder as water is removed. D. blue crystals is changed to white powder as water is removed |
12 |
| 379 | Q2. How is boron obtained from borax? Give chemical equations with reaction conditions. | 11 |
| 380 | Phosphoric acid is highly soluble in : A . oil B. Ammonia solution c. water D. Benzene |
12 |
| 381 | Give two uses of sulphur dioxide. | 12 |
| 382 | 54 Nitric acid forms an oxide of nitrogen on reaction with P,00. Write the reaction involved. Also write the resonating structures of the oxide of nitrogen formed. |
12 |
| 383 | Select incorrect statement about ( N_{2} O_{4} ) ( therefore ) A. It self ionises as ( N O^{+}, N O_{3}^{-} ) B. Substance containing ( N O^{+} ) is said to be acid and that containing ( N O_{3}^{-} ) is said to be base ( mathrm{C} cdot mathrm{N}_{2} mathrm{O}_{4} ) is paramagnetic D. ( N O_{2} ) dimerises to ( N_{2} O_{4} ) with disappearance in paramagnetism |
12 |
| 384 | A sulphate of a metal (A) on heating evolves two gases ( (mathrm{B}) ) and ( (mathrm{C}) ) and an oxide (D). Gas (B) turns ( K_{2} C r_{2} O_{7} ) paper green while gas (C) forms a trimer in which there is no ( S-S ) bond. Compound (D) with ( H C l ), forms a lewis Compounds ( (A),(B),(C),(D) ) and ( (E) ) are |
12 |
| 385 | An example of dibasic acid is: A. orthophosphorus acid B. orthophosphoric acid c. hypophosphorus acid D. pyrophosphoric acid |
12 |
| 386 | Select correct statement(s): This question has multiple correct options A. In ( alpha ) -graphite, the layers are arranged in the sequence ( A B A B ) B. ( ln beta ) -graphite, the layers are arranged in the sequence ( A B C A B C ) C. In ( alpha ) -graphite, the layers are arranged in the sequence ( A B C A B C ) D. ( ln beta ) -graphite, the layers are arranged in the sequence ( A B A B ) |
11 |
| 387 | The correct sequence of match for List- from List-II is: ( begin{array}{ll}text { List-I } & text { List-II } \ A) mathrm{O}_{2} & 1 text { ) Monoatomic } \ B text { Po } & 2 text { ) Bent molecule } \ C / mathrm{S}_{8} & text { 3) Paramagnetic } \ D) mathrm{O}_{3} & text { 4) Puckered ring }end{array} ) B. A-3, B-1, C-4, D-2 c. ( A-4, B-2, C-3, D-1 ) D. A-2, B-4, C-1, D-3 |
12 |
| 388 | In the oxidation of ( N_{2} H_{4} ) to ( N_{2} ) equivalent weight of ( N_{2} H_{4} ) would be |
12 |
| 389 | ( boldsymbol{S O}_{2} ) bleaches by A. reduction B. oxidation C. ionisation D. hydration |
12 |
| 390 | Assertion On cooling, the brown colour of nitrogen dioxide disappears. Reason On cooling, ( N O_{2} ) undergoes dimerisation resulting in the pairing of odd electrons of ( N 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 |
12 |
| 391 | What is the basicity of ( boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7} ) ? ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 3 ) D. 4 |
12 |
| 392 | Which of the following acids is produced by treating ( boldsymbol{K} boldsymbol{N} boldsymbol{O}_{3} ) with ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) under suitable experimental conditions? A. ( H N O_{2} ) в. ( H_{2} S O_{3} ) c. ( H N O_{3} ) D. ( H_{2} S_{2} O_{7} ) |
12 |
| 393 | Maximum covalency shown by sulphur is: A .2 B. 4 ( c .6 ) D. none |
11 |
| 394 | Sodium thiosulphate is used in: A. photography B. medicines c. explosive industry D. match industry |
12 |
| 395 | The catenation tendency of ( C, ) Si and Ge is in the order ( G e<S i<C ). The bond energies ( left(text { in } k J m o l^{-1}right) ) of ( C- ) ( C, S i-S i ) and ( G e-G e ) bonds respectively are: A. 348,167,180 B. 348,180,167 c. 167,180,348 D. 180,167,348 |
11 |
| 396 | The oxidation state of sulphur in the anions ( S O_{3}^{2-}, S_{2} O_{4}^{2-} ) and ( S_{2} O_{6}^{2-} ) follows the order: A ( cdot S_{2} O_{6}^{2-}<S_{2} O_{4}^{2-}<S O_{3}^{2} ) B. ( S O_{3}^{2-}<S_{2} O_{4}^{2-}<S_{2} O_{6}^{2} ) c. ( S_{2} O_{4}^{2-}<S O_{3}^{2-}<S_{2} O_{6}^{2-} ) D. ( S_{2} O_{4}^{2-}<S_{2} O_{6}^{2-}<S O_{3}^{2} ) |
12 |
| 397 | What is the action of chlorine on Excess ( N H_{3} ) |
12 |
| 398 | Quartz is a crystalline variety of : A . Silicon carbide B. Sodium silicate c. silica D. silicon |
11 |
| 399 | ( N H_{3}+H_{2} O longrightarrow(C)+(D)( ) both oxy acid) A ( cdot(c): H N O_{2} ; quad(D): H N O_{2} ) B ( cdot(mathrm{C}): H_{2} N O_{3} ; quad ) (D) ( : H N O_{3} ) C ( cdot(mathrm{C}): H N O_{2} ; quad(mathrm{D}): H N O_{3} ) D. None of these |
12 |
| 400 | Which of the following compounds is amphoteric? ( mathbf{A} cdot operatorname{Cr}(O H)_{2} ) B. ( F e(O H)_{2} ) ( mathbf{c} cdot operatorname{Cr}(O H)_{3} ) D. ( mathrm{Fe}(mathrm{OH})_{3} ) |
12 |
| 401 | How many ( mathrm{P}-mathrm{H} ) bonds are there in ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2} ? ) |
12 |
| 402 | Which of the following travels to different part of body through blood stream and provides oxygen? A. Haemoglobin B. Oxyhaemoglobin c. carboxyhaemoglobin D. none of these |
11 |
| 403 | The oxide that ( operatorname{gives} H_{2} O_{2} ) on treatment with a dilute acid is : A ( cdot P b O_{2} ) в. ( N a_{2} O_{2} ) ( mathrm{c} cdot M n O_{2} ) D. ( B a O_{2} ) |
12 |
| 404 | On heating with concentrated ( N a O H ) solution in an inert atmosphere of ( boldsymbol{C O}_{2} ) white phosphorous gives a gas.Which of the following statement is incorrect about the gas? A . It is less basic than ( N H_{3} ) B. It is more basic than ( N H_{3} ) c. It is highly poisonous and has smell like rotten fish D. It’s solution in water decomposes in the presence of light |
12 |
| 405 | ( P C l_{3} ) is a precursor to which type of chemical compounds? A. organophosphorus compounds B. Organonitrogen compounds c. organolithium compounds D. Organo compounds |
12 |
| 406 | Draw structure and write geometry of ( boldsymbol{P C l}_{3} ) and ( boldsymbol{P C l}_{5} ) |
12 |
| 407 | Consider following scheme involving oxides and oxy-acids of nitrogen. Out of the following which reactions are disproportionations? This question has multiple correct options |
12 |
| 408 | Gases: ammonia, chlorine, hydrogen chloride and sulphur dioxide Select the gas that matches the description given. Statement : The gas turns moist red litmus paper blue. A. Chlorine B. Ammonia c. Sulphur dioxide D. Hydrogen chloride |
12 |
| 409 | Blasting of TNT is done by mixing it with: A . ( mathrm{NH}_{4} mathrm{Cl} ) в. ( mathrm{NH}_{4} mathrm{NO}_{3} ) c. ( mathrm{NH}_{4} mathrm{NO}_{2} ) D. ( left(mathrm{NH}_{4}right)_{2} mathrm{SO}_{4} ) |
12 |
| 410 | Which of the following statement is true? A . Cold and very diluted ( H N O_{3} ) forms ( N H_{4} N O_{3} ) with ( Z n ) or ( S n ) B. Concentrated ( H N O_{3} ) forms ( H_{2} S n O_{3} ) with ( S n ) C . Cold and concentrated ( H N O_{3} ) forms ( N O_{2} ) with ( C u ) D. All the above statements are correct |
12 |
| 411 | The oxidation state of ( S ) in ( N a_{2} S_{4} O_{6} ) is: A . +2.5 B. +2 and +3 (two ( S ) have +2 and two ( S ) have +3 ) ( mathrm{c} cdot+2 ) and +3 (three ( S ) have +2 and one ( S ) has +3 D. +5 and 0 (two ( S ) have +5 and the other two ( S ) have 0 ) |
12 |
| 412 | Pyrophosphorous acid has the molecular formula: A. ( H_{3} P O_{3} ) в. ( H_{3} P O_{4} ) c. ( H_{4} P_{2} O_{5} ) D. ( H_{4} P_{2} O_{7} ) |
12 |
| 413 | Select the correct statement from following. A. Between ( N H_{3} ) and ( P H_{3}, N H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical s-orbital and is less directional B. Between ( N H_{3} ) and ( P H_{3}, P H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical ( s p^{3} ) orbital and is less directional C. Between ( N H_{3} ) and ( P H_{3}, N H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical ( s p^{3} ) orbital and is less directional D. Between ( N H_{3} ) and ( P H_{3}, P H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical s-orbital and is less directional |
12 |
| 414 | A bottle of liquor ammonia should be cooled before opening. A. True B. false c. sometimes true sometimes false D. none |
12 |
| 415 | Nitrogen liberated by the thermal decomposition of only: A. ( mathrm{NH}_{4} mathrm{NO}_{2} ) B. ( mathrm{NaN}_{3} ) ( mathrm{c} cdotleft(mathrm{NH}_{4}right)_{2} mathrm{Cr}_{2} mathrm{O}_{7} ) D. all the three |
12 |
| 416 | Pressure is increased in the Haber process for making ammonia. It favors: A. the reverse reaction B. the forward reaction c. neither reaction D. none |
12 |
| 417 | The increasing order of volatility of hydrides of the group 16 elements is : A. ( H_{2} S<H_{2} O<H_{2} S e<H_{2} T e ) в. ( H_{2} O<H_{2} T e<H_{2} S e<H_{2} S ) c. ( H_{2} O<H_{2} S<H_{2} S e<H_{2} T e ) D. none of these |
12 |
| 418 | Laughing gas is prepared by heating: A. ( N H_{4} C l+N a N O_{3} ) в. ( N H_{4} C l ) c. ( left(N H_{4}right)_{2} S O_{2} ) D. ( N H_{4} N O_{3} ) |
12 |
| 419 | Chlorine was discovered by: A. Priestley B. Davy c. scheele D. Cavendish |
12 |
| 420 | Phosphine is not evloved when: A. White phosphorus is boiled with a strong solution of ( mathrm{Ba}(mathrm{OH})_{2} ) B. Phosphorus acid is heated C. Calcium hypophosphite is heated D. Metaphosphoric acid is heated |
12 |
| 421 | Mustard gas is represented by formula: A ( cdot C H_{2} C l_{2} ) в. ( C_{4} H_{8} C l_{2} S ) c. ( C_{2} H_{2} ) D. ( C C l_{3} N O_{3} ) |
12 |
| 422 | Soluble wompe Q. 58 Phosphorus forms a number of oxoacids. Out of these oxoacids, phosphinic acid has strong reducing property. Write its structure and also write a reaction showing its reducing behaviour. uning nronerty |
12 |
| 423 | Fill in the blanks. Plastic sulphur is of ( boldsymbol{S}_{8} ) molecule |
12 |
| 424 | Identify the balanced chemical reaction of chlorine with respect to reactant ( D ) A ( cdot F e+C l_{2} rightarrow F e C l_{3} ) в. ( 2 F e+3 C l_{2} rightarrow 2 F e C l_{3} ) ( mathrm{c} cdot 2 mathrm{Fe}+6 mathrm{Cl}_{2} rightarrow 2 mathrm{FeCl} ) D. ( F e+C l_{2} longrightarrow F e C l_{3}+F e C l_{2} ) |
12 |
| 425 | ( X e F_{6} ) exists as ( left[X e F_{4}right]^{+2}left[2 H F_{2}right]^{-} ) in ( boldsymbol{H} boldsymbol{F} ) A. True B. False |
12 |
| 426 | Identify the compound ‘X’ : A. Magnesium Nitride B. Calcium nitride C . Nitrolim D. Sodium nitride |
12 |
| 427 | The gas which is supposed to be acidic anhydride : A ( cdot N O_{2} ) в. ( C O ) ( c cdot N_{2} O ) D. ( N O ) |
12 |
| 428 | The first noble gas compound prepared by Bartlett is : A ( cdot mathrm{xeF}_{2} ) в. КrF ( _{2} ) c. ( mathrm{xePtF}_{6} ) D. ( mathrm{xeO}_{3} ) |
12 |
| 429 | Which of the following electronic configuration corresponds to an inert gas? A ( cdot 1 s^{1} 2 s^{2} 2 p^{5} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ) ( mathbf{c} cdot 1 s^{2} 2 s ) D. ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} ) |
12 |
| 430 | R. 2 Which of the following is a Lewis acid? (a) AICI (b) MgCl2 (c) CaCl2 (d) BaCl2 |
11 |
| 431 | Which of the following is/are correct for group 14 elements? This question has multiple correct options A. The stability of dihalide is in the order of ( P b X_{2}> ) ( operatorname{Sn} X_{2}>operatorname{Ge} X_{2}>operatorname{Si} X_{2}>C X_{2} ) B. the ability to form ( p Pi-p Pi ) multiple bonds among themselves increases down the group C. the tendency for catenation decreases down the group D. they all from oxides with the formula MO |
11 |
| 432 | Consider the following properties of the noble gases: I: they readily from compounds which are colourless. II : they generally do not form ionic compounds. III : they have variable oxidation states in their compounds. ( I V: ) they generally do not form covalent compounds. Select the the correct properties. A. ( I, I I ) and ( I I I ) only B. II and III only C. ( I ) and ( I I I ) only D. I only |
12 |
| 433 | Oxidation state of +1 for phosphorous is found in : A ( . mathrm{H}_{3} mathrm{PO}_{3} ) в. ( mathrm{H}_{3} mathrm{PO}_{4} ) ( mathrm{c} cdot mathrm{H}_{3} mathrm{PO}_{2} ) D. ( mathrm{H}_{4} mathrm{P}_{2} mathrm{O}_{7} ) |
12 |
| 434 | Why fluorine is a stronger oxidizing agent than chlorine? | 12 |
| 435 | Question 10. In the ring text of NO3 ion, Fetion reduces nitrate ion to nitric oxide, which combines with Fe2+ (aq) ion to form brown complex. |
12 |
| 436 | The oxidation states of ( S ) atom in ( S_{4} O_{6}^{2-} ) from left to right respectively are ( mathbf{A} cdot+6,0,0,+6 ) В. +3,+1,+1,+3 c. +5,0,0,+5 ( mathbf{D} cdot+4,+1,+1,+4 ) |
12 |
| 437 | How many of the following is/are not obtained as one of the hydrolysis products of ( X e F_{2} ) with water? ( boldsymbol{X} boldsymbol{e} boldsymbol{O}_{3}, boldsymbol{X} boldsymbol{e}, boldsymbol{H} boldsymbol{F}, boldsymbol{O}_{2} ) A. B. 3 ( c cdot 4 ) D. |
12 |
| 438 | In presence of moisture ( boldsymbol{H}_{2} boldsymbol{S} ) can: A. act as oxidant B. lose electron c. gain electron D. none of these |
12 |
| 439 | The hybrid orbitals used by Phosphorus n the formation of ( mathbf{P C l}_{5} ) are : ( A cdot s p^{3} ) B ( cdot operatorname{sp}^{2} ) c. ( d s p^{2} ) ( D cdot s p^{3} d ) |
12 |
| 440 | The oxide of chlorine having the maximum oxidizing power is : A. ( C l_{2} O_{7} ) в. ( C l_{2} O_{6} ) c. ( C l_{2} O ) D. ( C l O_{2} ) |
12 |
| 441 | Due to the nature of catenation, carbon can form: A. Open chain compounds as well as branched chain compounds. B. Open chain compounds as well as closed chain compounds. C. Both ( A ) and ( B ) are correct D. None of these. |
11 |
| 442 | ( boldsymbol{A l}+boldsymbol{X} stackrel{Delta}{rightarrow} boldsymbol{Y} stackrel{boldsymbol{H}_{2} boldsymbol{O}}{rightarrow} boldsymbol{Z}+boldsymbol{N} boldsymbol{H}_{3} ) Here ( boldsymbol{X}, boldsymbol{Y} ) and ( boldsymbol{Z} ) are respectively: ( mathbf{A} cdot O_{2}, A l_{2} O_{3}, A l(O H)_{3} ) в. ( N_{2}, ) АlN, ( A l_{2} O_{3} ) c. ( N_{2}, ) AlN, ( A l(O H)_{3} ) D. ( C O_{2}, A l_{4} C_{3}, C H_{4} ) |
12 |
| 443 | Which element does not show allotropy? ( A cdot P b ) B. si ( c cdot c ) D. sn |
11 |
| 444 | Assertion Borax bead test is applicable only to coloured salts. Reason In borax bead test, coloured salts are decomposed to give coloured metal metaborates. 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 |
| 445 | ( H_{2} O_{2} ) is a: A. monobasic acid B. dibasic acid C. neutral compound D. weak alkali |
11 |
| 446 | Q33. An aqueous solution of borax is (a) neutral (b) amphoteric (c) basic (d) acidic |
11 |
| 447 | Write a balanced equation for each of the following observations: ( H N O_{3} ) turns brown when exposed to air. A ( cdot 2 H N O_{3} longrightarrow H_{2} O+2 N O+3(O), 2 N O+O_{2} rightarrow ) ( 2 N O_{2} ) в. ( 2 H N O_{3} rightarrow H_{2} O+2 N O+2(O), 2 N O+O_{2} rightarrow ) ( 2 N O_{2} ) c. ( 2 H N O_{3} longrightarrow H_{2} O+N O+3(O), N O+O_{2} longrightarrow 2 N O_{2} ) D. ( 2 H N O_{3} rightarrow H O+2 N O_{2}+3(O), 2 N O_{2}+O_{2} longrightarrow ) ( 2 N O_{2} ) |
12 |
| 448 | When burning potassium is brought in ( boldsymbol{S O}_{2} ) then: This question has multiple correct options A. it stop burning. B. it forms potassium thiosulphate. c. it forms potassium sulphite. D. sulphur is obtained as product |
12 |
| 449 | Assertion ( K, R b ) and ( C s ) form superoxides. Reason The stability of the superxides increases from ‘ ( K^{prime} ) to ( ^{prime} C s^{prime} ) due to decrease in lattice energy. 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 |
12 |
| 450 | The catalyst used in laboratory preparation of oxygen is: A. ( M g O ) в. ( M n O_{2} ) ( c cdot P t ) D. ( F e ) |
12 |
| 451 | Which of the following statements is/are correct? This question has multiple correct options A. The bleaching action of chlorine is due to oxidation and so permanent, while the bleaching action of sulphurdioxide is due to reduction and so temporary. B. ( H I ) cannot be prepared by heating an ionic iodide with conc. ( H_{2} S O_{4}, ) but ( H C l ) can be prepared by the same way. C. The oxidising power of halogens follow the order: ( C l_{2}>F_{2}>B r_{2}>I_{2} ) D. On reaction of ( X e F_{2} ) with water, no redox change takes place. |
12 |
| 452 | Hybridization on carbon atoms in diamond is : ( A cdot s p ) B ( cdot s p^{2} ) ( c cdot s p^{3} ) D. ( s p^{3} d ) |
11 |
| 453 | Nitric oxide is formed by the reaction of: A ( cdot C+N_{2} O ) в. ( C u+H N O_{3} ) c. ( C u+N_{2} O ) D. ( C u+N O_{2} ) |
12 |
| 454 | With reference to Haber’s process, write the equation and the conditions required. |
12 |
| 455 | More than four bonds are made by how many elements in carbon family? A . B. 2 ( c .3 ) D. 4 E. 5 |
11 |
| 456 | Q. 19 The oxidation state of central atom in the anion of comp of central atom in the anion of compound NaH PO, will be … (a) + 3 (b) + 5 (c) + 1 (d) – 3 Q.10 The orication state of content arom in the aion of compound Nation Ans. |
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| 457 | Assertion Statement -1: White phosphorus is less stable where as red phosphorus is more stable. Reason Statement -2: White phosphorus exist as individual ( P_{4} ) having more strained geometery while red phosphorus has ( boldsymbol{P}_{mathbf{4}} ) tetrahedron structure linked together. A. Statement – 1 is true, Statement – 2 is true and Statement – 2 is correct explanation for Statement – 1. B. Statement – 1 is true, Statement – 2 is true and Statement – 2 is NOT the correct explanation for Statement – 1 c. Statement -1 is true, Statement -2 is false D. Statement – 1 is false, Statement – 2 is true |
12 |
| 458 | Why is argon used in lamps? A. Argon forms molecules when electricity is passed through it B. Argon is inert and so does not react with the hot filament C. Argon is less dense than air D. Argon produces light when it burns |
12 |
| 459 | Commercial nitrogen is passed through copper chips kept in ammonia solution for removing oxygen.Why? | 12 |
| 460 | Which of the following is not suitable for use in dasiccator to dry substance? A . conc. ( H_{2} S O_{4} ) в. ( N a_{2} S O_{4} ) c. ( C a C l_{2} ) D. ( P_{4} O_{10} ) |
12 |
| 461 | What the covalency of phosphorous atom in excited state? ( A cdot 3 ) B. 4 ( c cdot 5 ) ( D ) |
11 |
| 462 | In which one of the following compounds, the oxidation number of sulphur is the least ( A cdot S O_{2} ) в. ( S O_{3} ) ( mathbf{c} cdot N a_{2} S O_{4} ) D. ( H_{2} S O_{4} ) |
12 |
| 463 | Assertion White phosphorus is more reactive than red phosphorus. Reason Red phosphorus contains tetrahedral units linked to one another to form linear chains. 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 |
12 |
| 464 | How many ( S-O-S ) linkage(s) is/are present in ( boldsymbol{H}_{2} boldsymbol{S}_{3} boldsymbol{O}_{6} ? ) |
12 |
| 465 | When copper is reacted with conc. sulphuric acid, which gas is evolved? A. ( H_{2} ) в. ( O_{2} ) ( c cdot S O_{2} ) D. ( S O_{3} ) |
12 |
| 466 | The atomic weight of noble gases is obtained by using the relationship: A. Atomic weight = equivalent weight ( x ) valency B. Atomic weight = equivalent weight/valency C. At. weight = valency/equivalent weight D. 2 x V.D. = molecular weight = atomic weight |
12 |
| 467 | The valencies of p block elements are equal to group number or 8 minus the group number. Therefore they show one lower valency and one higher valency. However, if we go to the bottom elements of any group, the compounds with lower valency are predominant whereas higher valency becomes rather uncommon. Explain. |
11 |
| 468 | Which of the following oxides is amphoteric in character? A. ( C a O ) в. ( C O_{2} ) ( mathrm{c} cdot operatorname{si} 0_{2} ) D. ( operatorname{sn} O_{2} ) |
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| 469 | The reaction of slaked lime with ( C l_{2} ) gas gives: A. only ( C a O C l_{2} ) B. only ( C a C l_{2} ) C. a mixture of ( C a(O C l)_{2}, C a(O H)_{2}, C a C l_{2} ) and ( H_{2} O ) D. quick lime |
12 |
| 470 | ( boldsymbol{S} boldsymbol{F}_{4} stackrel{text {hydrolysis}}{boldsymbol{X}}+boldsymbol{Y} ) ( boldsymbol{X}+boldsymbol{H}_{2} boldsymbol{S} rightarrow boldsymbol{Z} ) Here, ( Z ) is : ( A cdot S O_{3} ) B. colloidal sulphur c. gaseous sulphur D. solid sulphur |
12 |
| 471 | Match the following Set- Set – II A) ( F_{2} ) 1) pale yellow colour gas B) ( C l_{2} ) 2) violet colour solid C) ( B r_{2} ) 3) orange liquid D) ( boldsymbol{I}_{2} ) 4) greenish colour gas Correct the matching is A . A-1, B-3, C-2, D-4 B. A-1, B-4, C-3, D-2 c. ( A-2, B-3, C-4, D-1 ) D. A-3, B-2, C-1, D-4 |
12 |
| 472 | The atomic number of an element ( X ) is 34. Then it is present in period A. 4th period and IVA group B. 4 th period and VIA group c. 4 th period and VIIA group D. 5th period and VIA group |
12 |
| 473 | The reaction which gives Borazole as a major product is ? ( mathbf{A} cdot L i H+B_{2} H_{6}^{2 m o l e s L i H_{rightarrow} 1 m o l e B_{2} H_{6}} ) ( mathbf{B} cdot B_{2} H_{6}+N H_{3} frac{2 m o l e s B_{2} H_{6} 1 m o l e N H_{3}}{l o w t e m p} ) ( mathbf{c} cdot B_{2} H_{6}+N H_{3} frac{1 m o B_{2} H_{6} .2 m o l e s N H_{3}}{l o w t e m p} ) D. ( B_{2} H_{6}+N H_{3} frac{1 m o B_{2} H_{6} .2 text { moles } N H_{3}}{text {hightemp}} ) |
11 |
| 474 | Nitrogen is restricted to a maximum covalency of 4 since only four (one s and three ( p ) ) orbitals are available for bonding. The heavier elements have vacant d orbitals in the outermost shell which can be used for bonding (covalency) and hence, expand their covalence as in ( boldsymbol{P} boldsymbol{F}_{mathbf{6}}^{-} ) |
12 |
| 475 | Assertion ( boldsymbol{T} e boldsymbol{B} boldsymbol{r}_{4} ) and ( boldsymbol{P o} boldsymbol{B r}_{4} ) are quite stable while ( S B r_{4} ) and ( S e B r_{4} ) are unstable Reason Inert pair effect is greater in tetra bromides of ( S ) and ( S e ) than in ( T e ) and Po. 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 |
12 |
| 476 | Assertion Statement-1: Oxyacids of group VI A elements : ( boldsymbol{H}_{2} boldsymbol{S O} boldsymbol{4}, boldsymbol{H}_{2} boldsymbol{S} boldsymbol{e} boldsymbol{O}_{4}, boldsymbol{H}_{6} boldsymbol{T} boldsymbol{e} boldsymbol{O}_{6} ) Reason Statement-2: The lighter member where ( boldsymbol{O}(boldsymbol{2} boldsymbol{p}) rightarrow boldsymbol{X}(boldsymbol{3} boldsymbol{d}, boldsymbol{4} boldsymbol{d}) boldsymbol{pi} ) bonding is significant forms strong ( pi- ) bonds to give ( boldsymbol{X} boldsymbol{O}_{4}^{2-} ) A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement- B. Statement-1 is true, statement-2 is true and statement-2 is not the correct explanation for statement-1 c. Statement-1 is true, statement-2 is false. D. Statement-1 is false, statement-2 is true. |
12 |
| 477 | Formula of oleum is: ( mathbf{A} cdot H_{2} S O_{3} ) ( mathbf{B} cdot H_{2} S O_{4} ) ( mathbf{c} cdot H_{2} S O_{5} ) D. ( H_{2} S_{2} O_{7} ) |
12 |
| 478 | ( S O_{2} ) does not acts as: A. bleaching agent B. oxidising agent c. reducing agent D. dehydrating agent |
12 |
| 479 | Given are ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{3}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) and ( boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7} ) Which of the above oxoacids results into two series of salts? A ( . H_{3} P O_{2} ) в. ( H_{3} P O_{3} ) ( mathrm{c} . H_{3} P O_{4} ) D. ( H_{4} P_{2} O_{7} ) |
12 |
| 480 | Consider the following equilibrium: ( boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{N} boldsymbol{H}_{3} rightleftharpoons boldsymbol{N} boldsymbol{H}_{4}^{+}+boldsymbol{N} boldsymbol{H}_{2}^{-} ) Why ( N H_{3} ) undergo self ionization? |
12 |
| 481 | When fluoride is heated with conc. ( H_{2} S O_{4} ) and ( M n O_{2} ) the gas evolved is A. ( H F ) в. ( F_{2} ) ( mathrm{c} cdot S F_{4} ) D. None |
12 |
| 482 | The reason(s) for small radius of Ga compared to ( A l ) is/are : This question has multiple correct options A. poor screening effect of ( d ) and ( f ) orbitals. B. increase in nuclear charge c. presence of higher orbital D. higher atomic number |
11 |
| 483 | Assertion Red phosphorus is less reactive than yellow phosphorus. Reason Red phosphorus is insoluble in ( C S_{2} ) whereas white phosphorus is soluble. 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 |
12 |
| 484 | The least abundant element of IV A group is : A . B. si ( c cdot ) Ge D. Pb |
11 |
| 485 | The solid ( P C l_{5} ) exists as : A ( cdot P C l_{3} ) B ( cdot P C l_{4}^{+} ) c. ( P C l_{6}^{-} ) D. ( P C l_{4}^{+} ) and ( P C l_{6}^{-} ) |
12 |
| 486 | Which of the following is true for diamond? A. It is a good conductor of electricity B. It is very soft c. It is a good conductor of heat D. It is made up of carbon, hydrogen and oxygen atoms |
11 |
| 487 | Potassium permanganate ( rightarrow ) potassium manganate ( +A+ ) oxygen What is ( A ) in the given reaction? A. Manganese B. Manganese dioxide c. Manganese trioxide D. Manganese tetraoxide |
12 |
| 488 | sewage ettluent on the levels of oxygen concentration, bacterial population and algal growth in a fresh water stream. The given graph is plotted based on his findings. select the correct statement regarding the given graph. A. There is a fall in oxygen concentration between point and ( 4 mathrm{km} ) downstream because it is utilized by algae for respiration during day B. There is a rise in oxygen concentration between ( 4 mathrm{km} ) and ( 8 mathrm{km} ) downstream because of oxygen for respiration is lower C. Bacterial population never recovers from 8 km onwards because all the oxygen is used by algae D. There is decrease in the level of bacteria between ( 5 mathrm{km} ) and ( 7 mathrm{km} ) downstream because all the oxygen and organic matter has been used up by algal population |
11 |
| 489 | Question 12. Explain why the acidity of oxo-acids of chlorine increase in the order given below. HCIO < HCIO, < HCIO3 < HCIO, Selection |
12 |
| 490 | Select correct statement(s): ( mathbf{A} cdot O_{3} ) molecule is resonance stabilised. B. There is 3 -centre, 4 -electron ( pi ) -bond system in ( O_{3} ) C. Ozone layer is being depleted by fluorocarbons. D. All the above are correct statements. |
12 |
| 491 | The order of calorific values of fuel gases is: A. Carburetted water gas > Producer gas Semi water gas B. Carburetted water gas ( > ) Semi water gas Producer gas C. Producer gas ( > ) Semi water gas ( > ) Carburetted water gas D. Semi water gas > Producer gas Carburetted water gas |
11 |
| 492 | Zn gives ( mathrm{H}_{2} ) gas with ( mathrm{H}_{2} mathrm{SO}_{4} ) & HCl but not with HNO ( _{3} ) because: A. ( Z n ) act as oxidising agent when react with ( H N O_{3} ) B. ( H N O_{3} ) is weaker acid then ( H_{2} ) SO ( _{4} ) & ( H C l ) C. in electrochemical series ( Z n ) is above hydrogen D. ( N O_{3}^{Theta} ) is reduced in prefference to hydronium ion |
12 |
| 493 | Pnicogens are the elements of group: A . 15 B. 13 c. vıl D. zero |
11 |
| 494 | State uses of nitrogen | 12 |
| 495 | Which of the following elements can be involved in ( mathrm{p} pi-d pi ) bonding? A. carbon B. Nitrogen c. Phosphorus D. Boron |
12 |
| 496 | Which of the following gas is heavier than air? This question has multiple correct options A. ( N_{2} ) в. ( O_{2} ) ( c cdot C O_{2} ) D. ( H_{2} ) |
12 |
| 497 | Gas that strikes in thundering of light is : A. ( C O ) в. ( N O ) ( c cdot C O_{2} ) D. ( H_{2} ) |
12 |
| 498 | Which of the following hydrolysis product is not common in hydrolysis of ( X e F_{2} ) and ( X e F_{4} ) respectively? This question has multiple correct options A. ( X e O_{3} ) в. ( H F ) ( c cdot X e ) D. ( O_{2} ) |
12 |
| 499 | Q. 46 Boron fluoride exists as BF, but boron hydride doesn’t exist as BH 3. Give reason. In which form does it exist ? Explain its structure. |
11 |
| 500 | Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity | 12 |
| 501 | Noble gases are group of elements which exhibit very A. High chemical activity B. Low chemical activity c. Minimum electronegativity D. Much paramagnetic properties |
12 |
| 502 | Consider the following equilibrium reaction: ( boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{N} boldsymbol{H}_{3} rightleftharpoons boldsymbol{N} boldsymbol{H}_{4}^{+}+boldsymbol{N} boldsymbol{H}_{2} ) Find the ionic product of the above equilibrium reaction? |
12 |
| 503 | The fluoride of ( x e n o n ) with zero dipole moment is : This question has multiple correct options A ( cdot mathrm{xeF}_{6} ) в. ( mathrm{xeO}_{3} ) c. ( mathrm{xeF}_{4} ) D. XeF ( _{2} ) |
12 |
| 504 | Formula for the following compound Thallium (I) sulphate is ( T l_{2} S O_{4} ) A. True B. False |
11 |
| 505 | How many elements in group 14 are used as semiconductor? |
11 |
| 506 | Which of the folowing is incorrect? A. Nitric oxide depletes ozone layer in upper atmosphere B. ( O_{3} ) is a powerful oxidising agent C . Acidic strength increases from ( H_{2} ) Te to ( H_{2} O ) D. ( S O_{2} ) is redusing agent while ( T e O_{2} ) is an oxidising agent |
12 |
| 507 | Give reasons for the following: Iron is rendered passive with fuming nitric acid. |
12 |
| 508 | Which of the following gases is used for the qualitative analysis of metal ions? A. ( C O_{2} ) в. ( H_{2} ). ( c cdot s O_{2} ) D. ( S O_{3} ) |
12 |
| 509 | Which oxide is colourless and neutral? A. ( N_{2} O_{3} ) в. ( N_{2} ), ( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{4} ) D. ( N_{2} O_{5} ) |
12 |
| 510 | The action of bleaching powder on ethyl alcohol gives: A ( cdot mathrm{CCl}_{4} ) B. CHCls c. cocl D. Ether |
12 |
| 511 | ( mathrm{XeF}_{4} ) and ( mathrm{XeF}_{6} ) are expected to be A. oxidizing B. reducing c. unreactive D. strongly basic |
12 |
| 512 | The hybridisation state of the central atom and shape of the molecules is given below. Mark the incorrect combination. A . ( S O_{3}-s p^{2} ) hybridisation, planar triangular B. ( S O_{2}-s p^{2} ) hybridisation, ( V ) -shaped c. ( H_{2} S O_{4}-s p^{2} ) hybridisation, ( v ) -shaped D. ( O_{3}-s p^{2} ) hybridisation, angular |
12 |
| 513 | The order of stability of metal oxides is ( mathbf{A} cdot A l_{2} O_{3}<M g O<F e_{2} O_{3}<C r_{2} O_{3} ) B. ( C r_{2} O_{3}<M g O<A l_{2} O_{3}<F e_{2} O_{3} ) ( mathbf{c} cdot F e_{2} O_{3}<C r_{2} O_{3}<A l_{2} O_{3}<M g O ) D. ( F e_{2} O_{3}<A l_{2} O_{3}<C r_{2} O_{3}<M g O ) |
12 |
| 514 | ( begin{array}{ll}text { List-I } & text { List-II } \ text { A) } S_{8}+N a_{2} S O_{3} rightarrow & text { 1) } M text { ustard gas } \ text { B) } 2 C_{2} H_{4}+S_{2} C l_{2} rightarrow & text { 2) } H_{2} S O_{3} \ text { C) } S+3 F_{2} rightarrow & text { 3) } N a_{2} S_{2} O_{3} \ text { D) } S C l_{4}+H_{2} O rightarrow & text { 4) } S F_{6}end{array} ) The correct match is: ( A cdot(A)-4,(B)-2,(C)-1,(D)-3 ) B. ( (A)-3,(B)-1,(C)-4,(D)-2 ) C ( cdot(A)-1,(B)-3,(C)-2,(D)-4 ) D. ( (A)-2,(B)-4,(C)-3,(D)-1 ) |
12 |
| 515 | Fill in the blanks. sulphur is prepared by passing hydrogen sulphide gas into an aqueous solution of sulphur dioxide. |
12 |
| 516 | Shape of ( X e F_{2} ) molecule is : A. Trigonal bi pyramidal B. Tetrahedral c. Square pyramidal D. Linear |
12 |
| 517 | Draw the structure of xenon hexafluoride ( left(X e F_{6}right) ) molecule and state the hybridisation of the central atom. |
12 |
| 518 | When sulphur dioxide is passed in an acidified ( K_{2} C r_{2} O_{7} ) solution, the oxidation state of sulphur is changed from: A . +4 to 0 B. +4 to +2 ( mathbf{c} cdot+4 ) to +6 D. +6 to +4 |
12 |
| 519 | What is the hybridization of the chlorine ( operatorname{atom} operatorname{in} C l F_{3} ) molecule? |
12 |
| 520 | Wand X are ( _{text {- – }} ), respectively. ( A cdot O_{3} ) and ( P_{4} O_{6} ) B. ( O_{2} ) and ( P_{4} O_{6} ) ( mathrm{c} cdot mathrm{O}_{2} ) and ( P_{4} mathrm{O}_{1} ) D. ( O_{3} ) and ( P_{4} O_{1} ) |
12 |
| 521 | Explain the bleaching action of ozone. | 12 |
| 522 | How is phosphine prepared using the following reagents? (a) ( boldsymbol{H} boldsymbol{C l} ) (b) ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) (c) Caustic soda |
12 |
| 523 | In which of the following preparation, orthophosphoric acid is used? A. Metaphosphoric acid B. Phosphorus acid c. sulphurous acid D. Pyrophosphoric acid |
12 |
| 524 | Name the other ion formed when ammonia dissolves in water |
12 |
| 525 | Gold and platinum do not dissolve either in conc. ( H C l ) or conc. ( H N O_{3} ) but dissolves in the mixture of 3 parts of conc. ( H C l ) and 1 part of conc. ( H N O_{3} ) Give reason and write the necessary chemical equations. |
12 |
| 526 | Q. 67 Assertion (A) Both rhombic and monoclinic sulphur exist as S, but! oxygen exists as 0. Reason (R) Oxygen forms prt – ptt multiple bond due to small size and small bond length but prt – pit bonding is not possible in sulphur. Ane La Botha monts and reason is the |
12 |
| 527 | ( boldsymbol{B}(boldsymbol{O} boldsymbol{H})_{3}+boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H} rightleftharpoons boldsymbol{N} boldsymbol{a} boldsymbol{B} boldsymbol{O}_{2}+ ) ( boldsymbol{N} boldsymbol{a}left[boldsymbol{B}(boldsymbol{O} boldsymbol{H})_{4}right]+boldsymbol{H}_{2} boldsymbol{O} ) How can this reaction is made to proceed in forward direction? A. Addition of cis 1,2 diol B. Addition of borax c. Addition of trans 1,2 dio D. Addition of ( N a_{2} H P O_{4} ) |
11 |
| 528 | The probable element El can be: ( A cdot B ) ( B ) ( c ) ( D ) |
12 |
| 529 | Select the correct statement(s). This question has multiple correct options A. Passage of sulphur dioxide or of hydrogen sulphide (not in excess) in to a solution of an iodate acidified with dilute hydrochloric acid, liberates iodine B. Phosphate rock, ( C a_{3}left(P O_{4}right)_{2} ) on heating with sand and coke in electric furance at ( 1400-1500^{circ} mathrm{C} ) yields dimeric phosphorus pentaoxide C. Reaction of ( H_{2} S ) on aqueous solution of sodium sulphite yields sodium thiosulphate D. Sodium hypophosphite on warming with copper sulphate solution gives red precipitate of copper (I) hydride |
12 |
| 530 | 10) Change in enthalpy is negative for preparation in which of the following reactions conc. H SO, is used as an oxidising reagent? (a) CaF, + HSO Caso, + 2HF (b) 2 HI+ H,SO. -> 1,+ SO, + 2H2O (c) Cu + 2H,SO. – Cuso,+SO, + 2H,0 (d) NaCl + H SO N aHSO, + HCI |
12 |
| 531 | How does ammonia react with a solution of ( C u^{2+} ? ) |
12 |
| 532 | Write the name of radioactive halogen? | 12 |
| 533 | Which among the following oxides of nitrogen is called nitrogen sesquioxide? A ( cdot N O_{2} ) B. ( N_{2} O_{3} ) c. ( N_{2} O_{4} ) D. ( N_{2} O_{5} ) |
12 |
| 534 | Oxidative ozonolysis of 2-butene in the presence of zinc or dimethyl sulphide gives: A. ( C H_{3} C H O ) в. ( C H_{3} ) СООН ( c cdot C O_{2} ) D. ( left(C H_{3}right)_{2} C O ) |
12 |
| 535 | The number of lone pairs of electrons on xenon atom in ( mathrm{XeF}_{4} ) molecule is: ( A cdot 4 ) B. 3 ( c cdot 2 ) D. zero |
12 |
| 536 | Red and white phosphorus will differ but not in: A . smell B. solubility in ( C H C I_{3} ). c. exhibiting phosphorescence. D. reactions with ( H N O_{3} ) |
12 |
| 537 | In the known interhalogen compounds the maximum oxidation state of halogen atom is: ( A ) B. 5 ( c cdot 7 ) D. 8 |
12 |
| 538 | Describe laboratory method of preparation of sulphur dioxide giving chemical equations. Give chemical equations of the reactions of sulphur dioxide with potassium permanganate and lime water |
12 |
| 539 | 5. When glass is heated, it (a) does not melt at a fixed temperature (b) vapourises (c) melts only above 1000°C (d) None of these |
11 |
| 540 | Which of the following is acidic? A ( cdot N H_{3} ) в. ( N_{2} H_{4} ) c. ( N_{2} H_{2} ) D. ( N_{3} H ) |
12 |
| 541 | A mixture of three parts of concentrated hydrogen chloride with one part of concentrated nitric acid is known as: A . quick lime B. aqua regia c. hydrazine D. none of these |
12 |
| 542 | Which of the following property does not support anamolous behaviour of boron? A. Small size B. High electronegativity c. High ionization energy D. Formation of trinalides |
11 |
| 543 | Which of the following forms are the most basic in ( 0.1 mathrm{M} ) solution? A. ( mathrm{NaCl} ) в. NaOCl c. ( mathrm{NaClO}_{2} ) D. ( mathrm{NaClO}_{3} ) |
12 |
| 544 | Assertion Chlorine water must be stored in dark colored bottles. Reason Hypochlorous acid on exposure to sunlight decomposes to ( H_{2} ) and ( C l_{2} ) gas. 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 |
12 |
| 545 | In the clathrates of xenon with water, the nature of bonding between xenon and water molecule is : A. Covalent B. Hydrogen bonding c. Co-ordinate D. Dipole-induced dipole interaction |
12 |
| 546 | What is the chief constituent of Pyrex glass? A. ( B_{2} O_{3} ) as в. ( operatorname{si} 0_{2} ) c. ( A l_{2} O_{3} ) D. ( N a O_{2} ) |
11 |
| 547 | Amphoteric species is: A. ( N a_{3} P O_{4} ) B. ( H S O_{4}^{-} ) c. КОН D. ( H N O_{3} ) E ( cdot C_{2} O_{4}^{2-} ) |
12 |
| 548 | The composition in brown ring test is : ( mathbf{A} cdotleft[F eleft(H_{2} Oright)_{6} N Oright] S O_{4} ) ( mathbf{B} cdotleft[F eleft(H_{2} Oright)_{5} N Oright] S O_{4} ) ( mathbf{c} cdotleft[F eleft(H_{2} Oright)_{4}(N O)_{2}right] S O_{4} ) ( mathbf{D} cdotleft[F eleft(H_{2} Oright)_{3} N Oright] S O_{4} ) |
12 |
| 549 | Among the following compounds, which on heating do not produce ( N_{2} ? ) A ( cdotleft(N H_{4}right)_{2} C r_{2} O_{7} ) B. ( N H_{4} C l+N a N O_{2} ) c. ( N H_{4} C l+C a O ) D. ( B aleft(N_{3}right)_{2} ) |
12 |
| 550 | ( N_{2}(g)+3 H_{2}(g)_{200-300} frac{773 K}{b a r} 2 N H_{3}(g)+ ) heat Which of the following works as a catalyst? ( mathbf{A} cdot A l_{2} O_{3} ) в. ( K_{2} ), c. ( F e ) D. ( V_{2} O_{5} ) |
12 |
| 551 | Write the balanced reaction of ammonia with sulphuric acid. |
12 |
| 552 | Draw the structures of the following molecules: (i) ( boldsymbol{X} boldsymbol{e} boldsymbol{F}_{2} ) (ii) ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{8} ) |
12 |
| 553 | Equivalent weight of ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) in each of the reaction will be respectively: ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4}+boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{H}_{2} boldsymbol{P} boldsymbol{O}_{4}^{-}+boldsymbol{H}_{2} boldsymbol{O} ) ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4}+boldsymbol{2} boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{H} boldsymbol{P} boldsymbol{O}_{4}^{2-}+boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O} ) ( boldsymbol{H}_{3} boldsymbol{P O}_{4}+boldsymbol{3} boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{P} boldsymbol{O}_{4}^{3-}+boldsymbol{3} boldsymbol{H}_{2} boldsymbol{O} ) A . 98,49,32.67 B. 49, 98, 32.67 c. 98,32.67,49 D. 32.67, 49, 98 |
12 |
| 554 | Which of the following statements is true? ( mathbf{A} cdot H_{3} P O_{3} ) is stronger acid than ( H_{2} S O_{3} ) B. In aqueous medium, HF is a stronger acid than HCI C ( . H C l O_{4} ) is a weaker acid than ( H C l O_{3} ) D. ( H N O_{3} ) is a stronger acid than ( H N O_{2} ) |
12 |
| 555 | Which of the following acid occurs in polymeric form? A. ( H P O_{3} ) в. ( H_{4} P_{2} O_{7} ) c. ( H_{3} P O_{4} ) D. none of these |
12 |
| 556 | The compound used for etching of glass is: A. ( H ) B. HBr c. нс। D. нF |
11 |
| 557 | Identify the salts which on heating produce mixture of gases. This question has multiple correct options A. ( N a N O_{3} ) B. ( P bleft(N O_{3}right)_{2} ) c. ( C uleft(N O_{3}right)_{2} ) D. ( K N O_{3} ) |
12 |
| 558 | Select the correct options about the solubility of the following species in ( boldsymbol{H}_{2} boldsymbol{O} ) and ( boldsymbol{N} boldsymbol{H}_{3}(mathbf{a q}) ) ( A g F, A g C N, A g C l, A g l, C a F_{2}, C a C l_{2} ) This question has multiple correct options A ( . A g F ) and ( C a C l_{2} ) are soluble in ( H_{2} O ) B. ( A g C N ) and ( A g C l ) are soluble in ( N H_{3} ) c. ( A g I ) and ( C a F_{2} ) are soluble in ( H_{2} O ) and ( N H_{3} ) (aq) both D. None of these |
12 |
| 559 | Which one is most stable to heat: A . ( H C l O ) в. ( H C l O_{2} ) c. ( H C l O ) D. ( H C l O_{4} ) |
12 |
| 560 | A bottle completely filled with conc. ( H_{2} S O_{4} ) is left unstoppered for several days and we observe spontaneous overflow of acid. It is due to A. change in temperature B. hygroscopic nature of ( H_{2} S O_{4} ) C. absorption of air by ( H_{2} S O_{4} ) D. dehydration of ( H_{2} S O_{4} ) |
12 |
| 561 | Which of the following compound on hydrolysis form white turbidity? A ( cdot N C l_{3} ) в. ( P C l_{3} ) c. ( A s C l_{3} ) D. ( S b C l_{3} ) |
12 |
| 562 | Which process can be used for production of sulfuric acid from sulfur burning or for regeneration of the spent acid from alkylation plants? A. Moisture sulphuric acid B. Wet sulphuric acid c. Dry sulphuric acid D. Alkylating sulphuric acid |
12 |
| 563 | What are allotropes? Write the names of allotropes of phosphorus. | 12 |
| 564 | Which one of the following has the lowest m.p? ( A cdot B ) в. А। ( c cdot ) Ga D. T |
12 |
| 565 | ( beta ) sulphur is stable between: A ( cdot 114^{circ} mathrm{C} ) to ( 160^{circ} mathrm{C} ) B . ( 95.6^{circ} mathrm{C} ) to ( 119^{circ} mathrm{C} ) ( mathbf{c} cdot 160^{circ} C ) to ( 230^{circ} C ) D. ( 112.8^{circ} mathrm{C} ) to ( 140^{circ} mathrm{C} ) |
12 |
| 566 | Mustard gas can be prepared by the reaction of ethylene with: ( A cdot S F_{6} ) в. ( mathrm{SF}_{4} ) ( c cdot operatorname{sCl}_{2} ) D. None of the above |
12 |
| 567 | The number of steps in which orthophosphoric acid is ionized is : A. B. 2 ( c cdot 3 ) ( D ) |
12 |
| 568 | What is the formula of colorless inactive gas D? A. ( N_{2} ) в. ( H_{2} ) c. ( N H_{3} ) D. ( N O ) |
12 |
| 569 | Which of the following are used as fertilizers? This question has multiple correct options в. ( C aleft(H_{2} P O_{4}right)_{2} ) c. ( C a N C N ) D. ( C a C_{2} ) |
12 |
| 570 | The substance which does not produce ( mathrm{O}_{2} ) after reacting with ozone is: A. ( H_{2} O_{2} ) в. ( H g ) c. ( K O H ) ( mathrm{D} cdot mathrm{SO}_{2} ) |
12 |
| 571 | How is ammonia collected? A. Ammonia is less dense than air so it is collected by upward delivery. B. Ammonia is more dense than air so it is collected by upward delivery. C. Ammonia is more dense than air so it is collected by downward delivery. D. None of the above |
12 |
| 572 | 04. ee in Contact process so is not absorbed directly in water to from H.SO, because we reaction is highly exothermic, acid mist is formed. Hence, the reaction becomes dicunt handle Note SBurners Soz Precipator – Arsenic purifier Testing box Cooling and drying Conc H2SO4 H-S20 Oleum Absorption tower Catalyst chamber Preheater Flow chart of Contact process |
12 |
| 573 | Question 17. Nitric acid forms an oxide of nitrogen on reaction with P.01. Write the reaction involved. Also write the resonating structures of the oxide of nitrogen formed. |
12 |
| 574 | Hydride of nitrogen is called: A. dinitrogen hydride B. urea c. ammonia D. nitrous hydride |
12 |
| 575 | An element ( X ) forms two oxides ( X O ) and ( X O_{2} . ) The oxide ( X O ) is neutral but ( X O_{2} ) is acidic in nature. The element ( X ) is most likely to be: A. sulphur B. carbon c. calcium D. hydrogen |
11 |
| 576 | The basicity of phosphoric acid is: ( A cdot 1 ) B . 2 ( c .3 ) D. |
12 |
| 577 | A nitrogenous fertilizers having more nitrogen is : ( mathbf{A} cdotleft(mathrm{NH}_{4}right)_{2} mathrm{SO}_{4} ) B. ( C aleft(N O_{3}right)_{2} ) c. ( N H_{2} C O N H_{2} ) D. ( N H_{4} N O_{3} ) |
12 |
| 578 | Which one of the following arrangements does not give the correct picture of the trends indicated against it? This question has multiple correct options ( mathbf{A} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Bond dissociation energy ( mathbf{B} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Electronegativity ( mathbf{C} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Oxidizing nature D. ( F_{2}>C l_{2}>B r_{2}>I_{2}: ) Electron gain enthalpy |
12 |
| 579 | The ( p K_{a} ) of oxoacids of chlorine in water follows the order: A. ( H C l O<H C l O_{3}<H C l O_{2}<H C l O_{4} ) в. ( H C l O_{4}<H C l O_{3}<H C l O_{2}<H C l O ) c. ( H C l O_{4}<H C l O_{2}<H C l O_{3}<H C l O ) D. ( H C l O_{2}<H C l O<H C l O_{3}<H C l O_{4} ) |
12 |
| 580 | Give balanced equations for the following reactions: Concentrated hydrochloric acid and Potassium permanganate solution. |
12 |
| 581 | ( 1^{circ} ) alcohols preferably undergo dehydration in presence of ( A l_{2} O_{3} ) A. ( E_{1} ) в. ( E_{2} ) c. ( S_{N} 1 ) D. ( S_{N} 2 ) |
11 |
| 582 | The wrong statements about ( N H_{3} ) is : A. it is oxidised with oxygen at ( 700^{circ} mathrm{C} ) in the presence of platinum B. it gives black precipitate with calomel ( mathbf{C} cdot ) it can be dried by ( P_{2} O_{5}, H_{2} S O_{4} ) and ( C a C l_{2} ) D. it gives white fumes with HCI |
12 |
| 583 | Bauxite containing impurities of iron oxide is purified by : A. Hoop’s process B. Serpeck’s process c. Bayer’s process D. Electrolytic process |
11 |
| 584 | Which is the correct sequence in the following properties? For the correct order mark(T) and for the incorrect order mark (F): (a) Lewis acidity order: ( boldsymbol{S} boldsymbol{i} boldsymbol{F}_{4}< ) ( boldsymbol{S} boldsymbol{i} boldsymbol{C l}_{4}<boldsymbol{S} boldsymbol{i} boldsymbol{B} boldsymbol{r}_{4}S b H_{3}> ) ( boldsymbol{A} boldsymbol{s} boldsymbol{H}_{3}>boldsymbol{P} boldsymbol{H}_{3} ) (c) Boiling point ( : N H_{3}>S b H_{3}> ) ( boldsymbol{A} boldsymbol{s} boldsymbol{H}_{3}>boldsymbol{P} boldsymbol{H}_{3} ) (d) Dipole moment order : ( N H_{3}> ) ( boldsymbol{S b H}_{3}>boldsymbol{A s H}_{3}>boldsymbol{P H}_{3} ) A. FTFT в. TFTF c. FFTT D. FFTF |
12 |
| 585 | When ( H_{2} S ) gas is passed through nitric acid, the product is: A. rhombic sulphur B. prismatic sulphur c. amorphous sulphur D. monoclinic sulphur E. plastic sulphur |
12 |
| 586 | The bleaching action of chlorine is an oxidation reaction. Why? | 12 |
| 587 | ( boldsymbol{C} boldsymbol{a}_{2} boldsymbol{B}_{6} boldsymbol{O}_{11}+boldsymbol{2} boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C O}_{3} rightarrow boldsymbol{X}+ ) ( 2 C a C O_{3}+2 N a_{2} B O_{2} . ) The compound ( x ) in the above reaction is : A. ( N a_{2} B_{4} O_{7} ) в. ( H B O_{2} ) c. ( H_{3} B O_{3} ) D. ( H_{2} B_{4} O_{7} ) |
11 |
| 588 | Which of the following halides is the most stable? A. ( C C l_{4} ) в. ( C B r_{4} ) c. ( C F_{4} ) D. ( C l_{4} ) |
11 |
| 589 | Ozone is tested by: A ( . A g ) в. ( H g ) ( c cdot Z n ) D. ( A u ) |
12 |
| 590 | Nitrous oxide is: A. soluble in cold water. B. soluble in hot ( O H_{2} ) c. acidic in nature. D. none of these. |
12 |
| 591 | Assertion: Diborane has two types of hydrogens. Reason : By methylation only four hydrogen atoms of diborane are substituted forming ( M e_{4} B_{2} H_{2} ) |
11 |
| 592 | The gas oxygen from thermal decomposition of ( left(N H_{4}right)_{2} C r_{2} O_{7} ) A. Oxygen B. Nitric oxide c. Ammonia D. Nitrogen |
12 |
| 593 | What happens when white phosphorus is heated with concentrated ( N a O H ) solution in an inert atmosphere of ( C O_{2} ) ? |
12 |
| 594 | The following questions are based on the preparation of ammonia gas in the laboratory: Name the compound normally used as a drying agent during the process. |
12 |
| 595 | Choose the correct statement from the following: This question has multiple correct options A. Nitrogen is neutral to litmus B. Nitrogen is a noncombustible and non-supporter of combustion C. Nitrogen is a poisonous gas D. At low temperature, nitrogen can be liquefied on compression |
12 |
| 596 | The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak of helium nucleus. This implies that helium: A. can easily be broken up B. is very stable c. can be used as fissionable material D. is radioactive |
12 |
| 597 | Phosgene can obtained when: A. white phosphorus reacts with alkali B. calcium phosphide reacts with water. C. chloroform reacts with air. D. bone comes in contact with water. |
12 |
| 598 | Q32. Give one method for industrial preparation and one for laboratory preparation of CO and CO2 each. |
11 |
| 599 | Ammonia is used as a: A. fire extinguisher B. fertilizer C. refrigerant D. fungicide |
12 |
| 600 | Assertion The value of the van der Waals’ constant ( a^{prime} ) is larger for ammonia than for nitrogen. Reason Hydrogen bonding is present in ammonia. 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 |
12 |
| 601 | Which of the following does not contain fluorine? A. Fluorspar B. cryolite c. Flouorospatite D. Chile saltpeter |
12 |
| 602 | Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated? A. ( B r F_{3} ) : Planar T-shaped B. ( I C l_{3}: ) Planar dimeric C. ( I F_{7} ) : Pentagonal bipyramid D. ( B r F_{5} ) : Trigonal bipyramid |
12 |
| 603 | Give any three oxidation reactions of Ozone ( left(O_{3}right) ) with chemical equations. |
12 |
| 604 | Identify the correct statement(s) about orthoboric acid. This question has multiple correct options A. It has a layer structure in which planar ( B O_{3} ) units are joined by hydrogen bonds B. Orthoboric acid ( left(H_{3} B O_{3}right) ) is a weak monobasic Lewis acid c. on heating ortho-boric acid form meta-boric acid and on further heating to red hot,forms boric oxide anhdride D. None of the above |
11 |
| 605 | Statement – l: He -II has high viscosity and flows downward. Statement – II: Liquid helium is used as |
12 |
| 606 | Elements of group 14: This question has multiple correct options A. exhibit oxidation state of +4 only B. exhibit oxidation state of +2 and +4 C. form ( M^{2} ) and ( M^{4+} ) ions D. form ( M^{2+} ) and ( M^{4+} ) ions |
11 |
| 607 | The water gas when used for the formation of methanol is called: A. Fuel gas B. syngas c. Natural gas D. Producer gas |
11 |
| 608 | Which of the following statements is/are true about nitrogen? This question has multiple correct options A. Its atomic number is 7 B. It is very difficult to identify C. It is a typical non metal D. Ease of formation of triple bond |
12 |
| 609 | Draw structures of ( N H_{3}, P C l_{5}, P C l_{3} ) | 12 |
| 610 | What is released when di nitrogen trioxide is reacted with a base like ( N a O H ? ) ( A cdot O_{2} ) в. ( N_{2} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) D. no gas is released |
12 |
| 611 | The correct order of acidic strength of oxy – acids of chlorine is: ( mathbf{A} cdot H C l O<H C l O_{2}<H C l O_{3}<H C l O_{4} ) B ( cdot H C l O_{4}<H C l O_{3}<H C l O_{2}H C l O_{4}>H C l O_{3}>H C l O_{2} ) D. ( H C l O_{4}H C l O_{3}>H C l O ) |
12 |
| 612 | Which is true about ( N_{2} O_{5} ? ) This question has multiple correct options A. It is anhydride of ( H N O_{3} ) B. In solid state it exists as ( left[N O_{2}^{+}right]left[N O_{3}^{-}right] ) C. It is structurally similar at ( P_{2} O_{5} ) D. It can be prepared by heating ( H N O_{3} ) over ( P_{2} O_{5} ) |
12 |
| 613 | ( P H_{3} ) can be obtained by: This question has multiple correct options A. heating hypophosphorus acid. B. heating orthophosphorus acid. C. reacting white phosphorus with hot conc,NaOH. D. hydrolysis of calcium phosphide. |
12 |
| 614 | Nitrolim is a mixture of: A ( cdot mathrm{Ca} mathrm{C}_{2}+mathrm{N}_{2} ) B. ( mathrm{CaCN}_{2}+ ) graphite c. ( mathrm{Ca} ) NCN ( + ) diamond D. ( mathrm{Ca}(mathrm{CN})_{2}+mathrm{C} ) |
12 |
| 615 | The elements with atomic numbers 9 17,35,53 and 85 belong to noble gases columnz A. True B. False |
12 |
| 616 | a) How is chlorine prepared in Deacon’s process? How does it react with the following? ¡) Cold and dilute NaOH ii) Hot and concentrated NaOH b) Give chemical equations to manufacture of Sulphuric Acid by contact process. |
12 |
| 617 | Sulphur dioxide is a strong reducing agent. However, it can also act as an oxidizing agent. Which of the following reactions shows its oxidizing nature? A. Bleaching flower petalss B. Decolourising of acidfied KMnO ( _{4} ) solution c. Reaction with ( H_{2} S ) to give sulphur D. Turning acidified dichromate paper green |
12 |
| 618 | Compound A undergoes hydrolysis to produce a colourless gas with rotten fish smell. The gas gives a vortex ring. The gas is: A ( . P H_{3} ) в. ( P_{2} O_{3} ) c. ( P_{2} O_{5} ) D. ( P_{2} S_{5} ) |
12 |
| 619 | Write balanced equations for: (i) ( boldsymbol{B} boldsymbol{F}_{3}+boldsymbol{L} boldsymbol{i} boldsymbol{H} rightarrow ) (ii) ( B_{2} H_{6}+H_{2} O rightarrow ) (iii) ( N a H+B_{2} H_{6} rightarrow ) (iv) ( H_{3} B O_{3} stackrel{leftrightarrow}{rightarrow} ) (v) ( A l+N a O H rightarrow ) (vi) ( B_{2} H_{6}+N H_{3} rightarrow ) |
11 |
| 620 | Which of the following statements are true regarding oxides of nitrogen? This question has multiple correct options ( mathbf{A} cdot N O_{2} ) is a mixed anhydride of ( H N O_{2} ) and ( H N O_{3} ) B. ( N_{2} O_{3} ) is not soluble in water. C ( cdot N_{2} O ) and ( N O ) are anhydrides of ( H N O_{2} ) D. ( N_{2} O_{5} ) is anhydride of ( H N O_{3} ) |
12 |
| 621 | Hydrolysis of one mole of peroxodisulphuric produces: A. two moles of sulphuric acid. B. two moles of peroxomonosulphuric acid c. one mole of sulphuric acid and one mole of peroxomonosulphuric acid. D. one mole each of sulphuric acid peroxomonosulphuric acid and hydrogen peroxide. |
12 |
| 622 | ( P ) and ( Q ), respectively are the sodium salts of: A. hypochlorous and chloric acids B. hypochlorous and chlorous acids c. chloric and perchloric acids D. chloric and hypochlorous acids |
12 |
| 623 | ( S-S ) bond is present in : A ( cdot alpha-left(S O_{3}right)_{n} ) B ( cdot gamma-left(S_{3} O_{9}right) ) c. ( H_{2} S_{2} O_{3} ) D. ( H_{2} S_{2} O_{8} ) |
12 |
| 624 | Which type of hybridsation is present in carbon atom in fullerence? | 11 |
| 625 | The gas which burns with blue flame is: A. ( C O ) в. ( O_{2} ) c. ( N_{2} ) D. ( C O_{2} ) |
11 |
| 626 | Which of the following species is/are formed when conc. ( H N O_{3} ) is added to conc. sulphuric acid? This question has multiple correct options A ( cdot N O_{3} ) B. ( N O_{2}^{+} ) c. ( N O^{+} ) D. ( H S O_{4} ) |
12 |
| 627 | An inorganic salt (A) is decomposed at about ( 523 mathrm{K} ) to give products ( (mathrm{B}) ) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus paper while oxide (B) on burning with phosphorous, given a dehydrating agent (D). Compounds ( (A),(B),(C) ) and ( (D) ) will be identified as : A. ( N H_{4} N O_{3}, N_{2} O, H_{2} O, P_{2} O_{5} ) B. ( N H_{4} N O_{2}, k_{2} O, H_{2} O, P_{2} O_{5} ) c. ( C a C O_{3}, C a O, H_{2} O, C a C l_{2} ) D. ( C a C O_{3}, C a O, H_{2} O, C a(O H)_{2} ) |
12 |
| 628 | Choose the correct on from the given four options: Consider equation: [ mathrm{P}_{4} mathrm{O}_{10}+mathrm{H}_{2} mathrm{O} rightarrow mathrm{H}_{3} mathrm{PO}_{4} ] Number of moles of ( mathrm{H}_{3} mathrm{PO}_{4} ) produced by reaction are 1 mole of ( P_{4} O_{10} ) is 2 4 6 8 |
12 |
| 629 | Oxidation number of ( boldsymbol{F} ) in ( boldsymbol{H} boldsymbol{F} ) ( A cdot+1 ) B. – – ( c cdot 0 ) ( D cdot+2 ) ( E cdot+3 ) |
12 |
| 630 | Buckminster fullerene is: A. graphite B. diamond ( c cdot c-60 ) D. quartz |
11 |
| 631 | Which one has the highest boiling point? A ( cdot H_{2} O ) в. ( H_{2} ) Те c. ( H_{2} ) D. ( H_{2} S e ) |
12 |
| 632 | Based on M.O.T, explain the electronic configuration of the Hydrogen molecule and ( B e_{2} ) |
11 |
| 633 | Q.3 The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in [B(OH)] and the geometry of the complex are respectively (a) sp, tetrahedral (b) sp, square planar (c) spºd?, octahedral! (d) dsp?, square planar |
11 |
| 634 | Which of the following is most acidic? A ( . H_{2} O ) в. ( H_{2} ). ( mathbf{c} cdot H_{2} S e ) D. ( H_{2} T e ) |
12 |
| 635 | Make the correct pairs from below mentioned ( X ) and ( Y ) [ boldsymbol{X} ] a) Dehydrating agent 1) Sulphur dioxide gas b) In preparation of fire 2) Concentrated crackers ( quad ) sulphur acid c) Weak bleaching agent 3 ) Dihydrogen gas d) Lightest gas 4) Sulphur ( mathbf{A} cdot(a-2),(b-4),(c-1),(d-3) ) B ( cdot(a-3),(b-2),(c-4),(d-1) ) C ( .(a-4),(b-3),(c-1),(d-2) ) D. ( (a-3),(b-1),(c-2),(d-4) ) |
12 |
| 636 | The brilliance of diamonds is due to the internal reflection of light the light is slowed down and bent away from its original path because it strikes: A. tightly-bound nucleus B. the nucleus (centre) of carbon atoms c. loosely-held mobile electrons D. layers of carbon atoms |
11 |
| 637 | What may be expected to happen when phosphine gas is mixed with chlorine gas? A. ( P C l_{3} ) and ( H C l ) are formed and the mixture warms up B. ( P C l_{3} ) and ( H C l ) are formed and the mixture cools down C. The mixture only cools down D. None of the above |
12 |
| 638 | Chlorine turns moist starch iodide paper blue black.Why? |
12 |
| 639 | Select correct statement(s). A ( . ) Equivalent mass of ( X e O_{3}= ) ( frac{text {molar mass}}{6} ) and Equivalent mass of ( H X e O_{4}^{-}= ) ( frac{text { molar mass }}{6} ) B. As reaction I or II goes to forward side, pressure increases C. Both are correct statements D. None of the above is correct statement |
12 |
| 640 | Which of the following is not soluble in water? A. ( H_{2} ) в. ( O_{2} ) ( c cdot s O_{2} ) D. ( C O_{2} ) |
12 |
| 641 | Holmes signals can be given by using: A. ( C a C_{2}+C a C N_{2} ) В. ( C a C_{2}+C a_{3} P_{2} ) ( mathbf{c} cdot C a C_{2}+C a C O_{3} ) D. ( C a_{3} P_{2}+C a C N_{2} ) |
12 |
| 642 | Of the following, the anhydride of nitric acid is: A ( cdot N_{2} O ) B. ( N O ) ( c cdot N O_{2} ) D. ( N_{2} O_{5} ) |
12 |
| 643 | How many electrons can fit in the orbital for which ( n=3 ) and ( l=1 ? ) A . 10 B. 14 ( c cdot 2 ) D. 6 |
11 |
| 644 | Question 23. Why are halogens strong oxidizing agents? Halogens have only one electron less than the nearest inert gas configuration. |
12 |
| 645 | Which of the following compounds has hexagonal structure? A. Diamond в. ( N a C l ) c. ( K C l ) D. Graphite |
11 |
| 646 | ( C l_{2} ) gas acts as powerful oxidizing agent. Give reason. |
12 |
| 647 | Which of the following option is correctly matched? ( mathbf{A} cdot S_{2} O_{9} ; ) contains no ( S-S ) linkage B. ( S_{2} O_{6}^{2-} ; ) contains ( O-O ) linkage ( mathbf{C} cdotleft(H P O_{3}right)_{3} ; ) contains ( P-P ) linkage D. ( S_{2} O_{6}^{2-} ; ) contains ( S-S ) linkage |
12 |
| 648 | Which of the following does not have ( s-s ) linkage? ( A cdot S_{2} O_{8}^{2-} ) B. ( S_{2} O_{6}^{2-} ) ( mathrm{c} cdot S_{2} O_{5}^{2} ) D. ( S_{2} O_{3}^{2-} ) |
12 |
| 649 | Assertion Red phosphorus is used in match industry. Reason Red phosphorus shows phosphorescence. 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 |
12 |
| 650 | Red phosphorous is used in making: A . red plastics B. red dyes for plastics c. safety match-striking surfaces D. air fresheners |
12 |
| 651 | Which of them decomposes ( S O_{3} ) to ( S O_{2} ) ? A ( . S O C l_{2} ) в. ( S C l ) c. ( S C l_{2} ) D. ( N a O H ) |
12 |
| 652 | Question 1. In the preparation of H2SO4 by contact process, why SO, not absorbed directly in water to form H,SO,? |
12 |
| 653 | This wonderful acid has many uses. It is used for making explosives, pigments, dyes, hydrochloric acid, in sulphonation of oils to make detergents and in lead accumulators. Can you identify it? A. Sulphuric acid B. Sulphonic acid c. Nitric acid D. Sulphamic acid |
12 |
| 654 | Q35. The type of hybridisation of boron in diborane is (a) sp (6) sp2 (c) sp (d) dsp? |
11 |
| 655 | Which of the following contain ( boldsymbol{P}-boldsymbol{P} ) bond? A ( cdot P_{2} O_{7}^{4} ) B. ( P_{2} O_{6}^{2-} ) ( mathrm{c} cdot P_{3} O_{9}^{3-} ) D. ( P_{2} O_{6}^{4-} ) |
12 |
| 656 | When manganese dioxide is treated with ( H C l, ) oxidation state of chlorine on the product side is: This question has multiple correct options A . -1 B. 0 ( c cdot+1 ) ( D cdot+3 ) |
12 |
| 657 | The non-metal which cannot be oxidised to its corresponding acid by nitric acid is : A. carbon B. sulphur c. phosphorus D. chlorine |
12 |
| 658 | If 1 stands for true and 0 stands for false, then choose the correct code for the following statement: ( H_{2} S O_{4} ) is a weaker acid than ( H C l, ) yet ( H C l ) is evolved when conc. ( H_{2} S O_{4} ) is added to ( N a C l ) |
12 |
| 659 | ( H C l O_{4}, H N O_{3} ) and ( H C l ) are all very strong acids in aqueous solutions. In glacial acetic acid medium, their acid strength is such that: A ( cdot H C l O_{4}>H N O_{3}>H C l ) в. ( H N O_{3}>H C l O_{4}>H C l ) c. ( H C l>H C l O_{4}>H N O_{3} ) D. ( H C l>H C l O_{4} sim H N O_{3} ) |
12 |
| 660 | Of the following hydrides, which has the lowest boiling point? A ( . N H_{3} ) в. ( P H_{3} ) ( mathrm{c} cdot operatorname{SbH}_{3} ) D. ( A s H_{3} ) |
12 |
| 661 | Which one of the following pentafluoride cannot be formed? A. ( P F_{5} ) B. ( A s F_{5} ) c. ( S b F_{5} ) D. B iF |
12 |
| 662 | Make the correct pairs for the following given ( mathrm{X} ) and ( mathrm{Y} . mathrm{X} ) contains substance and Y has method of manufacture: [ x ] 1. Extraction of Sulphur ( quad ) p. Contact process 2. Production of Nitric acid q. Frasch method 3. Production of Sulphuric ( quad ) r. Haber’s process acid 4. Production of Ammonia ( quad ) s. Ostwald’s gas ( quad ) process A ( cdot(1-s),(2-r),(3-q),(4-p) ) B. ( (1-r),(2-q),(3-s),(4-p) ) C ( .(1-q),(2-s),(3-p),(4-r) ) D. ( (1-s),(2-q),(3-r),(4-p) ) |
12 |
| 663 | Paramagnetic species are : A. ( N O, N O_{2}, O_{2} ) в. ( N_{2} O_{2}, N_{2} O_{2}, N_{2} O_{4}, O_{3} ) c. ( N O^{+}, N O_{2}^{+}, O_{2}^{+} ) D. ( O_{2}, C O, C O_{2} ) |
12 |
| 664 | The only non-metal, which is a liquid at room temperature is: ( A cdot O_{2} ) B. ( mathrm{F}_{2} ) ( c cdot N_{2} ) D. Bra |
12 |
| 665 | ( H_{3} P O_{2} ) is a weak monobasic acid. A. True B. False |
12 |
| 666 | The no. of ( boldsymbol{P}-boldsymbol{O}-boldsymbol{P} ) bond(s) in cyclic metaphosphoric acid is(are): ( mathbf{A} cdot mathbf{0} ) B . 2 ( c .3 ) D. |
12 |
| 667 | Which of the following compound(s) is/are peroxyacids? This question has multiple correct options A ( . H C l O_{4} ) в. ( H_{2} S O_{5} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{8} ) D. ( H_{3} P O_{5} ) |
12 |
| 668 | Which of the following name is given to the hydrochloric acid by Lavoiser? A. Mutaric acid B. Glutaric acid c. Tartaric acid D. King of acids |
12 |
| 669 | In presence of small amount of water, ( P C l_{5} ) hydrolyzes to form: A ( cdot P C l_{3} ) в. Рос c. ( P O C l_{3} ) D. ( H_{3} P O_{3} ) |
12 |
| 670 | Write down name, structural formula and Hybridization of two Xenon compounds? |
12 |
| 671 | Oxygen is highly soluble in water. A. True B. False |
12 |
| 672 | The final product obtained when boric acid is heated to red heat is : A. metaboric acid B. tetraboric acid c. boron oxide D. pyroboric acid |
11 |
| 673 | ( mathrm{XeF}_{2} ) molecule is A. Trigonal planar B. Square planar C. Linear D. Pyramidal |
12 |
| 674 | In the solid state ( P C l_{5} ) exists as: A ( cdotleft[P C l_{4}right]^{-} ) and ( left[P C l_{6}right]^{+} ) ions B. covalent ( P C l_{5} ) molecules only ( mathbf{c} cdotleft[P C l_{4}right]^{+} ) and ( left[P C l_{6}right]^{-} ) ions D. covalent ( P_{2} C l_{10} ) molecules only |
12 |
| 675 | A bottle of liquor ammonia should be cooled before opening. Give reason. | 12 |
| 676 | Give one word for the following. An acid prepared from sulphur. | 12 |
| 677 | Perchloric acid is prepared by the action of concentrated sulphuric acid on: A ( cdot mathrm{NaClO}_{4} ) в. ( mathrm{KClO}_{3} ) c. ( left.operatorname{ca}left(mathrm{ClO}_{3}right) mathrm{lO}_{3}right) ) D. Bac |
12 |
| 678 | Assertion ( A l(O H)_{3} ) is amphoteric in nature. Reason Al-O and O-H bonds can be broken with equal ease in ( A l(O H)_{3} ) 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 |
12 |
| 679 | Which of the following order(s) is/are incorrect? This question has multiple correct options ( mathbf{A} cdot H_{2} P O_{4}>H_{3} P O_{3}>H_{3} P O_{2} ) (reducing character) B. ( N_{2} O<N OP H_{3}>A s H_{3}>S b H_{3}(text { basicity }) ) D ( cdot S b H_{3}>N H_{3}>A s H_{3}>P H_{3} ) (reducing character) |
12 |
| 680 | Graphite is a good conductor of electricity due to ? A. Its giant tetrahedral polymer structure B. Its high refractive index c. Presence of free and mobile electrons D. High IP value of carbon |
11 |
| 681 | Chlorine reacts with nitric oxide to form? A. ( N O C l_{2} ) в. ( N O C l ) ( mathbf{c} cdot N O_{2} C l_{2} ) D. ( N O_{2} C l ) |
12 |
| 682 | Sulphur colloid prepared by: A. mechanical dispersion B. oxidation c. electrical dispersion D. reduction |
12 |
| 683 | The compound molecular in nature in gas phase but ionic in solid state is : A. ( P C l_{5} ) в. ( C C l_{4} ) c. ( P C l_{3} ) D. ( P O C l_{3} ) E. None of the above |
12 |
| 684 | Account for the following: (i) ( B i(V) ) is a stronger oxidizing agent ( operatorname{than} boldsymbol{S b}(boldsymbol{V}) ) (ii) ( N-N ) single bond is weaker than ( boldsymbol{P}-boldsymbol{P} operatorname{single} ) bond (iii) Noble gases have very low boiling points. |
12 |
| 685 | Assertion Conc. ( H_{2} S O_{4} ) can not be used to prepare pure HBr from NaBr. Reason It reacts slowly with NaBr 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 |
12 |
| 686 | Q3. Why does borontrifluoride behave as a Lewis acid? | 11 |
| 687 | The carbon – carbon bond length in graphite is : A . ( 1.34 A^{circ} ) B . 1.54 ( A^{circ} ) c. ( 1.42 A^{circ} ) D . 1.20A |
11 |
| 688 | Which of the following is an example of super octet molecule? A. ( S F_{6} ) в. ( P C l_{5} ) c. ( I F_{7} ) D. All the three |
12 |
| 689 | Borax is the sodium salt of: A. Ortho boric acid. B. Meta boric acid. C. Tetra boric acid. D. Pyro boric acid. |
11 |
| 690 | Which of the following oxoacids of nitrogen has most acidic character? I. ( N_{2} O_{3} ) ( boldsymbol{I} boldsymbol{I} cdot boldsymbol{N} boldsymbol{O}_{2} ) III. ( N_{2} O_{5} ) ( I V . N O ) ( mathbf{A} cdot I I ) в. ( I I I ) ( c . I V ) ( D ) |
12 |
| 691 | On adding ( H_{2} O ) to ( B i C l_{3} ) solution in ( H C l ) the compound produced is: ( mathbf{A} cdot B i_{2} O_{3} ) B ( cdot B i(O H)_{3} ) c. В гОС D. ( B i O C l ) |
12 |
| 692 | Which of the following combines with ( F e(I I) ) ions to form a brown complex? A ( cdot N_{2} O ) B. ( N O ) ( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{3} ) D. ( N O_{2} ) |
12 |
| 693 | Which of the following undergoes hydrolysis very easily? A ( cdot mathrm{NCl}_{3} ) в. PCls c. ( mathrm{AsCl}_{3} ) D. BiCla |
12 |
| 694 | The building units of various crystalline forms of boron are: A ( cdot B_{12} ) icosahedral units B. ( B_{4} ) tetrahedral units c. ( B_{6} ) octahedral units D. ( B_{6} ) cubical units |
11 |
| 695 | Assertion: Fluorine exists only in -1 oxidation state. Reason: Fluorine has ( 2 s^{2} 2 p^{5} ) configuration 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 |
12 |
| 696 | Which product will obtained in the following reaction? Reaction: ( boldsymbol{P}_{4_{(a)}}+mathbf{3} boldsymbol{N a O H}_{(a q)}+ ) ( mathbf{3} boldsymbol{H}_{2} boldsymbol{O}_{(l)} longrightarrow ) ( mathbf{A} cdot P H_{3_{(a)}}+3 N a_{2} H P O_{2_{(a)}} ) B. ( P H_{3_{(a)}}+3 N a H_{2} P O_{2_{l a q}} ) C. ( 2 P H_{3_{(l)}}+3 N a_{2} H P O_{2_{l a}} ) D. ( 2 P H_{3_{(l)}}+3 N a H_{2} P O_{2_{l a}} ) |
12 |
| 697 | Q. 41 Describe the general trends in the following properties of the elements in groups 13 and 14. (a) Atomic size (b) Ionisation enthalpy (c) Metallic character (d) Oxidation states (e) Nature of halides |
11 |
| 698 | Argyrodite, briartite contain appreciable amounts of ( -? ) A . lead B. germanium c. zinc D. copper |
11 |
| 699 | Man dies in an atmosphere of carbon monoxide because it : A ( cdot ) combines with the ( O_{2} ) present in the body to form ( C O_{2} ) B. reduces the organic matter of tissues. c. combines with hemoglobin of blood, making it incapable of absorbing ( O_{2} ) D. dries up the blood |
11 |
| 700 | toppr Q Type your question_ – ( 2 I^{-}(a q)+S_{2} O_{8}^{2-}(a q) rightarrow I_{2}(a q)+ ) ( 2 S_{2} O_{4}^{-2}(a q)(s l o w) ) ( boldsymbol{I}_{2}(boldsymbol{a} boldsymbol{q})+boldsymbol{2} boldsymbol{S}_{2} boldsymbol{O}_{3}^{2-}(boldsymbol{a} boldsymbol{q}) rightarrow boldsymbol{2} boldsymbol{I}^{-}(boldsymbol{a} boldsymbol{q})+ ) ( boldsymbol{S}_{4} boldsymbol{O}_{boldsymbol{6}}^{boldsymbol{2}-}(boldsymbol{a} boldsymbol{q})(boldsymbol{f} boldsymbol{a} boldsymbol{s} boldsymbol{t}) ) A little of these sulphate ions along with starch are added in the first reaction. The iodine formed in the first reaction reacts with sulphate ions and the blue colour of iodine starts developing as soon as the whole ( S_{2} O_{3}^{2-} ) are used up. The sulphur containing atoms in the course of reactions are: This question has multiple correct options ( mathbf{A} ) [ left[begin{array}{c} o \ o-S^{prime}-O \ _{o} end{array}right]^{2} ] B. [ left[begin{array}{cc} o & o \ O-S^{prime}-O-O-S^{prime}-O \ _{O} & _{O}^{prime} end{array}right]^{2-} ] ( c ) [ left[begin{array}{c} o \ O-underset{S}{S}-S \ o end{array}right]^{2} ] D. [ left[begin{array}{cc} o & o \ O-S & -S-S-S^{prime} \ rho & vdots \ o end{array}right]^{2-} ] |
12 |
| 701 | In which of the following molecules, central atom involve expansion of octet? A ( cdot P C l_{3} ) в. ( N C l_{3} ) c. ( C l F_{3} ) D. None of these |
12 |
| 702 | In which part of the atmosphere, ( boldsymbol{O}_{3} ) is present? A. Mesosphere B. Stratosphere c. Troposphere D. Lithosphere |
12 |
| 703 | A radioactive element X decays to give two inert gases. X is : ( A cdot frac{238}{92} mathrm{U} ) B ( cdot frac{286}{88} ) Rа ( mathbf{C} cdot_{84}^{20 mathrm{p}} mathrm{o} ) D. ( frac{223}{87} ) Fr |
12 |
| 704 | How will you identify ( S O_{2}^{2-} ) in presence of ( boldsymbol{C O}_{3}^{2-} ) ? A. by odour. B. color change c. PH measurement. D. weight measurement. |
12 |
| 705 | In one of the industrial processes used for the manufacture of sodium hydroxide, a gas ( X ) is formed as a by-product. The gas ( X ) reacts with lime water to give a compound ( Y ) which is used as a bleaching agent in the chemical industry. Identify ( boldsymbol{X} ) and ( boldsymbol{Y} ) A. ( X ) is chlorine; ( Y ) is baking soda B. ( X ) is chlorine; ( Y ) is bleaching powder c. ( X ) is hydrogen; ( Y ) is potash D. ( X ) is hydroge; ( Y ) is plaster of paris |
12 |
| 706 | Which of the following is not a green house gas? A. ( C O_{2} ) в. ( C H_{4} ) ( c cdot O_{3} ) D. ( N_{2} X ) |
12 |
| 707 | Question 10. Write a balanced equation for the hydrolytic reaction PC1, in heavy water. Reactions are same as those with water (H.0). |
12 |
| 708 | Zero group elements are known ( a s ) A. alkali metals B. alkaline earth metals C. transition metals D. inert gases |
12 |
| 709 | Find the number of sesquioxide(s) from the following: ( boldsymbol{A l}_{2} boldsymbol{O}_{3}, quad boldsymbol{C}_{3} boldsymbol{O}_{2}, quad boldsymbol{C O}_{2}, quad boldsymbol{P b}_{2} boldsymbol{O}_{3} ) |
12 |
| 710 | Prepare an acid salt from dil. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) A ( cdot 2 H_{2} S O_{4}+2 C H_{3} C O O N a rightarrow 2 N a H S O_{4}+ ) ( C H_{3} C O O H ) в. ( 2 H_{2} S O_{4}+C H_{3} C O O N a rightarrow 2 N a H S O_{4}+C H_{3} C O O H ) c. ( H_{2} S O_{4}+C H_{3} C O O N a rightarrow N a H S O_{4}+C H_{3} C O O H ) D. ( H_{2} S O_{4}+2 C H_{3} C O O N a rightarrow N a H S O_{4}+2 C H_{3} C O O H ) |
12 |
| 711 | If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately: A. 800 m! B. 200 m c. ( 10 mathrm{ml} ) D. 20 m |
12 |
| 712 | Why is ( B F_{3} ) used as a catalyst in several industrial processes? | 11 |
| 713 | Action of ( boldsymbol{P C l}_{5} ) on ( boldsymbol{S O}_{2} ) chiefly yields: A ( . P O C l_{3} ) в. ( P_{4} S_{3} ) c. ( s O_{2} C l_{2} ) |