We provide the s-block elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the s-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 s-block elements Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Of the following the commonly used as a laboratory desiccator is : A. ( N a_{2} C O_{3} ) в. ( C a C l_{2} ) c. Nacı D. None of the above |
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| 2 | Which is the major constituent of gun powder? A. Nitre B. Sulphur c. charocal D. Chile salt petre |
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| 3 | The solubility in water is more for: A. ( B a C O_{3} ) в. ( B e C O_{3} ) ( mathrm{c} cdot mathrm{CaCO}_{3} ) D. ( M g C O_{3} ) |
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| 4 | The element having greatest difference between its first and second ionization energies is: A. ( C a ) в. ( K ) ( c . B a ) D. ( S e ) |
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| 5 | Slaked lime is obtained when water is added to: A ( cdot operatorname{CaSO}_{4} cdot frac{1}{2} mathrm{H}_{2} mathrm{O} ) в. ( C a C l_{2} ) ( c cdot C a O ) D. ( C a C O_{3} ) |
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| 6 | State whether the given statement is true or false: A solution of a substance ( X ) is used for |
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| 7 | In Solvay ammonia process, sodium bicarbonate is precipitated due to A . presence of ( N H_{3} ) B. reaction with ( C O_{2} ) C. reaction with brine solution D. reaction with NaOH |
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| 8 | Alkali metals cannot be extracted by reduction of their oxides and other compounds because: A. alkali metals are strong reducing agents B. alkali metals have low ionisation enthalpy C. alkali metals have high lattice enthalpy D. alkali metals are strongly basic in nature |
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| 9 | Baking powder is a mixture of: A. Sodium carbonate and acetic acid B. Sodium carbonate and tartaric acid C. Sodium hydrogen carbonate and tartaric acid D. Sodium hydrogen carbonate and acetic acid |
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| 10 | Lithium on heating in air forms mainly ( L i_{2} O ) (oxide) and not peroxide ( left(L i_{2} O_{2}right) ) If true enter 1 else 0 |
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| 11 | The reaction that takes place when ( C l_{2} ) gas is passed through conc. NaOH solution is : A . oxidation B. reduction c. displacement D. disproportionation |
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| 12 | “Alkali metals dissolve in liquid ammonia to give green coloured solutions which upon standing slowly liberate ( boldsymbol{H}_{2} ). The green colour of metalammonia solutions is due to the presence of solvated electrons.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 |
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| 13 | Molten sodium chloride conducts electricity due to the presence of: A. free electrons B. free molecules c. atoms D. free ions |
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| 14 | In which case second has lower boiling point than first? This question has multiple correct options A . Li, K в. Ве, Мg ( c cdot operatorname{li}, c s ) D. са, мв |
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| 15 | Soda ash is prepared by passing over a concentrated solution of sodium hydroxide. A ( . H_{2} ) в. ( O_{2} ) ( mathrm{c} cdot H_{2} ) D. ( C O_{2} ) |
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| 16 | Arrange ( boldsymbol{N} boldsymbol{a}^{+}, boldsymbol{M} boldsymbol{G}^{2+}, boldsymbol{O}^{2-}, boldsymbol{F}^{-} boldsymbol{A} boldsymbol{l}^{3+}, boldsymbol{N}^{3-} ) (each having 10 electrons) in increasing ionic radii. ( mathbf{A} cdot A l^{3+}<M g^{2+}<N a^{+}<F^{-}<O^{2-}<N^{3-} ) B. ( N^{3-}<O^{2}<F^{-}<N a^{+}<M g^{2+}<A l^{3+} ) C ( cdot A l^{3+}<M g^{2+}<F^{-}<N a^{+}<O^{2-}<N^{3-} ) D. None of these |
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| 17 | Which of the following statement is incorrect? A. Sodium and potassium are soft and silvery white metals. B. Sodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates. C. Sodium and potassium burn in dry oxygen (excess) gives peroxides. D. Sodium and potassium are kept under kerosene to avoid contact with air and moisture. |
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| 18 | Alkali metals impart blue color to: A. acidic solution B. ammonia solution c. nitrate solution D. none of these |
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| 19 | Which of the following is/are constituents of cement?? A. ( operatorname{si} O_{2} ) в. ( A l_{2} O_{3} ) ( mathrm{c} cdot mathrm{CaSO}_{4} ) D. All of the above |
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| 20 | The most lightest alkaline earth metal is: ( A . B e ) в. ( M g ) ( c . C a ) D. Ba |
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| 21 | Solubility of the alkaline earth’s metal sulphates in water decreases in the sequence: A. ( S r>C a>M g>B a ) в. ( B a>M g>S r>C a ) c. ( M g>C a>S r>B a ) |
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| 22 | Gypsum on heating gives: This question has multiple correct options ( ^{mathbf{A}} cdot operatorname{CaSO}_{4} cdot frac{1}{2} H_{2} O ) B ( cdot C a S O_{4} ) ( mathbf{c} cdot C a O ) ( mathbf{D} cdot C a S+O_{2} ) |
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| 23 | 0.17 The formula of soda ash is (a) Na ,CO, 101,0 (c) Na2CO3.H2O (b) Na2CO, 2H,0 (d) Na2CO3 |
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| 24 | In seas, mainly how do marine organism build their shells? | 11 |
| 25 | The solubility of II group hydroxides increases with molecular weight. This is because: A. lattice energy is same but hydration energy decreases down the group. B. hydration energy is same but lattice energy decreases down the group C. both lattice and hydration energy increase down the group D. decrease in lattice energy down the group is faster than decrease in hydration energy. |
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| 26 | “Lithium is the only metal among alkali metals that can form nitride.” Answer whether the above statement is |
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| 27 | Q Type your question One of the chief uses of sodium carbonate has been in the conversion of ( operatorname{Ca}(O H)_{2}(s) ) to concentrated aqueous solution of NaOH which in turn was used in the manufacture of soap. ( boldsymbol{C a}(boldsymbol{O H})_{2}(boldsymbol{s})+boldsymbol{2} boldsymbol{N} boldsymbol{a}^{+}(boldsymbol{a q})+ ) ( boldsymbol{C O}_{3}^{2-}(boldsymbol{a q}) rightleftharpoons boldsymbol{C a C O}_{3}(boldsymbol{s})+ ) ( mathbf{2} N boldsymbol{a}^{+}(boldsymbol{a} boldsymbol{q})+mathbf{2} boldsymbol{O} boldsymbol{H}^{-}(boldsymbol{a} boldsymbol{q}) ) In ( 1775, ) in order to gain independence from the importation of natural ( N a_{2} C O_{3}, ) the French government offered a prize to anyone who could devise a process to prepare ( N a_{2} C O_{3} ) from NaCl A more economical process but based |
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| 28 | Among ( L i C l, R b C l, B e C l_{2} ) and ( M g C l_{2} ) which two are the highest and the lowest ionic compounds? A. ( L i C l ) & ( R b C l ) в. ( R b C l & B e C l_{2} ) c. ( R b C l & M g C l_{2} ) D. ( M g C l_{2} & B e C l_{2} ) |
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| 29 | When sodium is dissolved in pure liquid ammonia, then along with ( boldsymbol{H}_{2} ) the other product formed is: A. sodium B. sodium amide c. sodium ammoniate D. sodium tetra ammoniate |
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| 30 | 41. Which of the following is very reactive and kept in kerosene? (1) Sodium (2) Potassium (3) Iodine (4) Bromine |
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| 31 | Q5. Explain the following: (a) Why Cs is considered as the most electropositive element? (6) Lithium cannot be used in making photoelectric cells. (c) Lithium does not form alums. |
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| 32 | Q16. Why is BeCl, soluble in organic solvent? | 11 |
| 33 | ( boldsymbol{B} boldsymbol{e} boldsymbol{C l}_{2}+boldsymbol{L} boldsymbol{i} boldsymbol{A} boldsymbol{l} boldsymbol{H}_{4} longrightarrow boldsymbol{X}+boldsymbol{L} boldsymbol{i} boldsymbol{C l}+ ) ( boldsymbol{A l C l}_{3} ) A. ( X ) is lithium hydride B. ( X ) is ( B e H_{2} ) c. ( X ) is ( B e C l_{2} cdot 2 H_{2} O ) D. ( X ) is ( L i H ) |
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| 34 | Which of the following imparts violet colouration to the Bunsen burner non- luminous flame? ( mathbf{A} cdot N a C l ) в. ( B a C l_{2} ) c. ( C a C l_{2} ) D. KCl |
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| 35 | Be ( O ) is almost insoluble but ( B e S O_{4} ) is soluble in water. Explain. |
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| 36 | When magnesium ammonium phosphate is heated, it is converted to: A. magnesium pyrophosphate B. magnesium oxide c. magnesium phosphate D. magnesium nitride |
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| 37 | Which are true statements about ( s ) block elements? This question has multiple correct options A. Metals are obtained by the electrolytic of fused chlorides. B. Oxides are basic except Be0 C ( .+1 ) valency by alkali metals and +2 valency alkaline earth metals is shown D. carbonates are thermally stable |
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| 38 | Suspension of slaked lime in water is known as: A . lime water B. quick lime c. milk of lime D. aqueous solution of slaked lime. |
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| 39 | Fluorides and phosphates of alkali metals are: A. completely soluble in water B. sparingly soluble in water C. completely soluble in water except ( L i ) and ( M g ) D. completely insoluble in water except ( L i ) and ( M g ) |
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| 40 | What is the chemical composition of Nicol prism? A. ( A l_{2} O_{3} ) в. ( mathrm{CaSO}_{4} ) ( mathrm{c} cdot mathrm{CaCO}_{3} ) D. ( N a_{3} A l F_{6} ) |
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| 41 | Which of the following reactions is called slaking of lime? A ( cdot C a C O_{3} rightarrow C a O+C O_{2} ) в. ( C a O+2 H C l rightarrow C a C l_{2}+H_{2} O ) c. ( C a O+H_{2} O rightarrow C a(O H)_{2}+ ) heat D. ( C a C O_{3}+N a C l rightarrow N a_{2} C O_{3}+C a C l_{2} ) |
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| 42 | The elements that reacts with cold water: A . Mg B. Са ( c . ) Ве D. Mg & Ca |
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| 43 | The list gives four experiments done with calcium carbonate. acid added 2 alkali added 3 heated strongly 4 water added Which experiments produced carbon dioxide? A. 1 and 2 B. 1 and 3 ( c cdot 2 ) and 3 D. 2 and 4 |
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| 44 | Potash alum is represented by the formula: A ( cdot K_{2} S O_{4} cdot A l_{2}left(S O_{4}right)_{3} cdot 24 H_{2} O ) B . ( K cdot A lleft(S O_{4}right)_{2} cdot 12 H_{2} O ) c. Both (a) and (b) D. None of these |
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| 45 | Choose the correct options regarding the nature of oxides formed by ( L i ) and ( boldsymbol{B e}: ) This question has multiple correct options A ( cdot L i_{2} O ) is acidic while ( B e O ) is basic B. ( B e O ) is amphoteric. ( mathrm{c} cdot mathrm{Li}_{2} mathrm{O} ) is basic D. ( L i_{2} O ) and ( B e O ) both are amphoteric |
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| 46 | Draw a structure of ( B e C l_{2} ) in vapour phase. |
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| 47 | Dilute nitric acid was added to the calcium oxide. |
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| 48 | Assertion Sodium reacts with oxygen to form ( N a_{2} O_{2} ) but postassium reacts with oxygen to form ( K O_{2} ) Reason Potassium is more reactive metal than sodium. 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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| 49 | Assertion The superoxide ( M O_{2} ) contains the paramagnetic ion ( boldsymbol{O}_{mathbf{2}}^{-} ) Reason ( O_{2}^{-} ) is stable in presence of large cations as ( boldsymbol{K}, boldsymbol{R} boldsymbol{b}, boldsymbol{C} boldsymbol{s} ) 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. Assertion is incorrect but Reason is correct |
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| 50 | Two metals ( X ) and ( Y ) belong to the second group of the periodic table. ( boldsymbol{X} ) forms insoluble oxide but soluble sulphate. ( Y ) forms a soluble oxide but insoluble sulphate. The hydroxide of metal ( X ) is soluble in ( N a O H ) while that of metal ( Y ) is insoluble in ( N a O H . ) What are metals ( X ) and ( Y ? ) A. ( X=B e, Y=B a ) в. ( X=M g, Y=C a ) c. ( X=C a, Y=S r ) D. ( X=B a, Y=M g ) |
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| 51 | “Be dissolves in alkali to give ( N a_{2} B e O_{2} ) and ( H_{2} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 |
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| 52 | 0.27 Choose the correct statements from the following. (a) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal (b) Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of Be + overcomes the lattice enthalpy factor (c) Beryllium exhibits coordination number more than four (d) Beryllium oxide is purely acidic in nature |
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| 53 | The list gives four experiments carried out with calcium carbonate. 1 acid added 2 alkali added 3 heated strongly 4 water added Which experiments produce carbon dioxide? A. 1 and 2 B. 1 and 3 ( c cdot 2 ) and 3 D. 2 and 4 |
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| 54 | Following reaction is used to remove temporary hardness which is due to dissolved bicarbonates of ( C a^{2+} ) and ( M g^{2+} ) ( boldsymbol{C a}left(boldsymbol{H} boldsymbol{C O}_{3}right)_{2}+boldsymbol{C a}(boldsymbol{O H})_{2} rightarrow ) ( 2 C a C O_{3} downarrow+2 H_{2} O ) Actually lime ( ( C a O ) ) is added which in ( H_{2} O ) forms ( C a(O H)_{2} ) and precipitates ( boldsymbol{C a} boldsymbol{C O}_{3} boldsymbol{C a O}+boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{C a}(boldsymbol{O H})_{2} ) If ( 10 mathrm{L} ) of hard water requires ( 0.56 mathrm{g} ) of Ca 0 , temporary hardness of ( C a C O_{3} ) is ( x times 10^{2} ) ppm. Find ( x ) |
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| 55 | Metallic calcium is prepared by: A. displacement of calcium by iron from calcium sulphate solution B. electrolysis of molten calcium chloride C. reduction of lime by coke D. electrolysis of aqueous solution of calcium nitrate |
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| 56 | The product obtained on fusion of ( B a S O_{4} ) and ( N a_{2} C O_{3} ) is: A. ( B a C O_{3} ) в. Ва О ( mathbf{c} cdot B a(O H)_{2} ) D. ( B a H S O_{4} ) |
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| 57 | Q. 31 Complete the following reactions (1) 0₂ ² + H₂O (11) 0₂ + H₂O |
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| 58 | Passivity is exhibited by: ( A) B e, B) M g, C) A l, D) B ) A ( . A, B ) в. ( B, C ) c. ( A, C ) D. ( B, D ) |
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| 59 | Statement: Sodium, when heated in excess of oxygen, gives sodium oxide. State whether the given statement is true or false. A. True B. False |
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| 60 | Assertion Group 2 metals have higher melting points when compared to the group 1 metals. Reason +2 charge on the cations in the metallic lattice causes them to be more strongly attracted to the sea of electrons and making it difficult to pull them apart. 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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| 61 | ANS. IL 15 anyuruus Calcium Sulputate ca Q8. What is Quick lime? What happens when it is added to water? |
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| 62 | When exposed to air, sodium carbonate crystals lose water, turn into ( mathbf{a}: ) A. monohydrate B. nanohydrate c. decahydrate D. hexahydrate |
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| 63 | 2.52 An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identity the element and write chemical reactions of the hydroxide of the element with an alkali and an acid. |
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| 64 | Find the number of chloride(s) which do not impart color to the flame from the following: ( boldsymbol{B} boldsymbol{e} boldsymbol{C l}_{2}, boldsymbol{S r} boldsymbol{C l}_{2}, boldsymbol{M} boldsymbol{g} boldsymbol{C l}_{2}, boldsymbol{C a C l}_{2}, boldsymbol{B a C l}_{2} ) |
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| 65 | The low solubility of LiF and that of Cs| in water are respectively due to which of the properties of the alkali metal ions? A. Higher hydration enthalpy of ( L i^{+} ), higher lattice enthalpy of ( C s^{+} ) B. Smaller hydration enthalpy of ( L i^{+} ), higher lattice enthalpy of ( C s^{text {t }} ) C. smaller lattice enthalpy of ( L i^{+} ), higher hydration enthalpy of ( C s^{+} ) D. Higher lattice enthalpy of ( L i^{+} ), Smaller hydration enthalpy of ( C s^{text {t }} ) |
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| 66 | What are the uses of sodium bicarbonate? (Any three) |
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| 67 | Q1. Why are alkali metals always univalent? Which alkali metal ion forms largest hydrated ion in aqueous solution? |
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| 68 | To pour water on calcium oxide.”which is another way to classify this reaction? Explain |
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| 69 | A major constituent of natural gas is: A ( . quad ) NaH ( mathrm{CO}_{3} ) в. ( H_{2} S O_{4} ) ( mathrm{c} cdot mathrm{CH}_{4} ) D. ( C a(O H)_{2} ) |
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| 70 | Q23. Why is Lif almost insoluble in water whereas LiCl soluble not only in water but also in acetone? T . TE |
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| 71 | Only those elements of s-block can produce superoxides which have : A. High ionisation energy B. High electronegativity c. High charge density D. Low ionisation potential |
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| 72 | The following flow diagram represents the manufacturing of sodium carbonate? ( mathbf{2} boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{C} boldsymbol{O}_{2} longrightarrow ) ( left(N H_{4}right)_{2} C O_{3}(a q) stackrel{(a)}{longrightarrow} N H_{4} H C O_{3} stackrel{(b)}{longrightarrow} ) ( boldsymbol{N} boldsymbol{a} boldsymbol{H} boldsymbol{C O}_{3}+(boldsymbol{c}) ) ( downarrow(d) ) ( N a_{2} C O_{3}+C O_{2}+H_{2} O ) Which of the following option describes the underlined reagents, products and reaction conditions? A ( cdot ) (a) – Carbon dioxide, ( (b)-N a C l,(c)-N H_{4} C l, ) (d) – Heat B. (a) – Carbon dioxide, (b) – ( N a C l ), (c) ( -N H_{4} C l ), (d) Catalyst c. (a) – Higher tempt., (b) – ( N a C l ), (c) ( -N H-4 C l ), (d) Heat D. (a) – Higher pressure, (b) – ( N a C l ), (c) ( -N H_{4} C l ), (d) Catalyst |
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| 73 | As the nuclear charge increases from neon to calcium, the orbital energies: A. increase B. increase very rapidly c. increase very slowly D. fall |
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| 74 | “Sodium metals when dissolved in ammonia gives a non-conducting solution.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 |
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| 75 | Be on dissolving in aqueous ( N a O H ) yields: A. ( N a_{2} B e O_{2} ) B ( cdot N a_{2}left[operatorname{Be}(O H)_{4}right] ) c. ( operatorname{Na}left[operatorname{Be}(O H)_{3}right] ) D. Both (A) and (B) |
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| 76 | Consider the following statements and arrange in the order of true/false as given in the codes. ( S_{1}: ) Sodium amalgam reacts with hot water and produces sodium hydroxide and hydrogen gas. ( S_{2}: ) Sodium is more reactive than potassium. ( S_{3}: ) Alkaline earth metals dissolve in liquid ammonia to give deep blue-black solutions which are conducting. ( S_{4}: ) Alkaline earth metal salts have more number of water molecules as compared to those of alkali metal salts. A. TTFF в. тFा c. FTT D. TFFT |
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| 77 | Q. 44 Assertion (A) The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2. Reason (R) Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li,0 and CO2. (a) Both A and R are correct and R is the correct explanation of A (b) Both A and R are correct but is not the correct explanation of A (c) Both A and R are not correct (d) A is not correct but R is correct |
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| 78 | Identify ( mathrm{W}, mathrm{X}, mathrm{Y}, ) and ( mathrm{Z} ) respectively in the given reactions. ( boldsymbol{C a C O}_{3} stackrel{triangle}{rightarrow} boldsymbol{W}+boldsymbol{X} ) ( boldsymbol{W}+boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{Y} ) ( boldsymbol{Y}+boldsymbol{Z} rightarrow boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H}+boldsymbol{C a C O}_{3} ) A. ( C a O, C O_{2}, C a C O_{3}, N a_{2} C O_{3} ) в. ( C O_{2}, ) Са( (O H)_{2}, C a(H C O)_{3}, N a H C O_{3} ) c. ( C a O, C O_{2}, C a(O H)_{2}, N a_{2} C O_{3} ) D. ( C O_{2}, C a O, H_{2} C O_{3}, N a_{2} C O_{3} ) |
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| 79 | In the mineral, barium ion can be identified by : A. green colour in ame B. yellow precipitate with ( C r O_{4}^{2-} ) solution C. white precipitate with ( S O_{4}^{2} ) D. all of the above |
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| 80 | The main oxides formed on combustion of ( L i, N a ) and ( K ) in excess of air are respectively: A. ( L i O_{2}, N a_{2} O_{2} ) and ( K_{2} O ) в. ( L i_{2} O_{2}, N a_{2} O_{2} ) and ( K O_{2} ) c. ( L i_{2} O, N a_{2} O_{2} ) and ( K O_{2} ) D. ( L i_{2} O, N a_{2} O ) and ( K O_{2} ) |
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| 81 | Q. 35 Why are Beso, and MgSO, readily soluble in water while CaSO4, SrSO4 and BaSo, are insoluble? |
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| 82 | Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give ( C ) and ( D ). A solution of C becomes milky on bubbling carbon dioxide. Identify ( A, B, C ) and ( D: ) A ( cdot A=N a ; B=N a_{3} N_{2} ; C=N a(O H)_{2} ; D=N H_{3} ) B. ( A=K ; B=K_{3} N_{2} ; C=K O H ; D=N H_{3} ) C. ( A=C a ; B=C a_{3} N_{2} ; C=C a(O H)_{2} ; D=N H_{3} ) D. ( A=B a ; B=B a_{3} N_{2} ; C=B a(O H)_{2} ; D=N H_{3} ) |
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| 83 | Among ( K O_{2}, A l O_{2}^{-}, B a O_{2} ) and ( N O_{2}^{+} ) unpaired electron is present in: |
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| 84 | Which of the following statements are true about the alkali metals? This question has multiple correct options A. All alkali-metal salts impart a characteristic colour to the Bunsen flame. B. Among LiOH, CsOH, KOH, and RbOH, CsOH has the highest solubility in water. C. Among the alkali metals, cesium is the most reactive. D. The reducing character of the alkali metal hydrides follow the order: ( L i H>N a H>K H>R b H>C s H ) |
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| 85 | In the reaction ( M+O_{2} longrightarrow M O_{2} ) (super oxide) the metal is : A ( . L i ) в. ( N a ) ( c . K ) D. ( B a ) |
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| 86 | Q Type your question ( mathbf{A} cdot 2 C H_{3} C O O H+N a_{2} C O_{3} rightarrow 2 C H_{3} C O O N a+H_{2} O+ ) ( C O_{2} ) (Test tube ( B ) ) ( left.C a(O H)_{2}+C O_{2} rightarrow C a C O_{3}+H_{2} O text { (Test tube } Aright) ) B ( cdot 2 C H_{3} C O O H+N a_{2} C O_{3} rightarrow 2 C H_{3} C O O N a+H_{2} O+ ) ( C O_{2}(text { Test tube } A) ) ( left.C a(O H)_{2}+C O_{2} rightarrow C a C O_{3}+H_{2} O text { (Test tube } Bright) ) ( mathbf{c} cdot C H_{3} C O O H+N a_{2} C O_{3} rightarrow C H_{3} C O O N a+H_{2} O+ ) ( C O_{2}(text { Test tube } A) ) ( left.C a(O H)_{2}+C O_{2} rightarrow C a C O_{3}+H_{2} text { (Test tube } Bright) ) D ( cdot 2 C H_{3} C O O H+N a_{2} C O_{3} rightarrow 2 C H_{3} C O O N a+H_{2} O+ ) ( C O text { (Test tube } A) ) ( left.mathrm{Ca}(mathrm{OH})_{2}+mathrm{CO}_{2} rightarrow mathrm{CaCO}_{3}+mathrm{H}_{2} mathrm{O} text { (Test tube } Bright) ) |
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| 87 | Which of the following metals form just one kind of oxide? This question has multiple correct options A. Sodium B. Rubidium c. caesium D. Potassium |
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| 88 | Solutions of alkali metals in liquid ammonia at ( -33^{circ} mathrm{C} ) conduct electricity without chemical reaction at the electrodes. Hence, conductivity should : A. increase as temperature is lowered B. decrease as temperature is lowered c. remain constant on changing the temperature D. there is always interaction of alkali metal with liquid ammonia |
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| 89 | The decreasing order of hydration enthalpies earth metal ions is: ( mathbf{A} cdot B e^{2+}>B a^{2+}>C a^{2+}>S r^{2+} ) B ( cdot B a^{2+}>S r^{2+}>C a^{2+}>M g^{2+}>B e^{2+} ) ( mathbf{C} cdot B e^{2+}>C a^{2+}>M g^{2+}>B e^{2+} ) D ( cdot B e^{2+}>M g^{2+}>C a^{2+}>S r^{2+}>B a^{2+} ) |
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| 90 | Which one of the following products is formed when a mixture of steam, sulphur dioxide gas and oxygen gas (from air) is passed over dry lumps of common salt, the sodium chloride? A. ( N a_{2} S O_{3} ) в. ( C l_{3} ) ( mathbf{c} cdot operatorname{NaH} S O_{3} ) D. ( N a_{2} S O_{4} ) |
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| 91 | The temporary hardness of water due to calcium bicarbonate can be removed by adding: A. ( C a C O_{3} ) в. ( C a(O H)_{2} ) c. ( C a C l_{2} ) D. ( H C l ) |
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| 92 | The common ingredient required for making cement and glass is: A. washing soda B. baking soda c. limestone D. potash |
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| 93 | Q4. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain. |
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| 94 | Which anion is stable towards water: ( A cdot O^{2} ) в. ( O_{2}^{2} ) ( c cdot O_{2} ) D. None of these |
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| 95 | Compare and contrast the chemistry of group 1 metals with that of group 2 metals with respect to the following: Polarizing power of cations increases on going from group 1 to group 2. |
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| 96 | Beryllium forms hydrate peroxide, ( B e O_{2} cdot H_{2} O ) A. True B. False |
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| 97 | The correct order regarding the solubility of alkaline earth metal halides in water is : A ( cdot B e C l_{2}<M g C l_{2}<C a C l_{2}<S r C l_{2}<B a C l_{2} ) в. ( M g C l_{2}B e C l_{2}>B a C l_{2}>S r C l_{2} ) C. ( B a C l_{2}>M g C l_{2}>C a C l_{2}>B e C l_{2}>S r C l_{2} ) D. ( B e C l_{2}>M g C l_{2}>C a C l_{2}>S r C l_{2}>B a C l_{2} ) |
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| 98 | Which of the following statements is true about ( boldsymbol{C a}(boldsymbol{O H})_{2} ? ) A. It is used in the preparation of bleaching powder B. It is light blue solid c. It does not process disinfectant property D. It is used in the manufacture of cement |
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| 99 | ‘The enthalpy of hydration decreases in ( operatorname{going} ) from ( L i^{+} ) to ( C s^{+} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 100 | Among the following the least thermally stable is: A. ( K_{2} C O_{3} ) B. ( N a_{2} C O_{3} ) ( mathrm{c} . B a C O_{3} ) D. ( L i_{2} C O_{3} ) |
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| 101 | When baking soda reacts with vinegar, is formed. A. sodium carbonate B. sodium hydrogen carbonate c. sodium acetate D. none of above |
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| 102 | A milkman adds a very small amount of baking soda to fresh milk. The pH will : A. increase B. decrease c. same as milk D. none of these |
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| 103 | Q. 14 Dead burnt plaster is (a) CaSO4 (b) C (c) CaSO4 H20 (d) CaSO4-2H,0 |
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| 104 | Which substance when used with butter having butyric acid can cure acidity? A . lime water B. Soda water c. calcium carbonate D. lime juice |
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| 105 | Answer the questions based on the following flow-sheet. Following are some statements about species ( C ) Select correct statement(s). This question has multiple correct options ( mathbf{A} cdot mathrm{C} ) is ( N H_{4} C l ) B. ( mathrm{C} ) is ( mathrm{NaHCO}_{3} ) C ( cdot mathrm{C} ) is recycled into ( mathrm{Ca}(mathrm{OH})_{2} ) chamber to from ( mathrm{NH}_{3} ) ( D cdot mathrm{C} ) is ( N a_{2} C O_{3} ) |
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| 106 | Assertion Ca ( F_{2} ) has been given the name fluorspar. Reason Solid ( C a F_{2} ) emits light when heated. 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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| 107 | ation of hydrates of haboes of calciu, baru and strontium 26,0, B2, -2H-0. STOL-2H,0, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these habides? Actas dehydrating agent Can absorb moisture from a Tendency to form bydrae decreases from calcium to barium d. All of the above |
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| 108 | The alkali metal which acts as a nutrient for plants is: A. ( N a ) в. ( K ) ( c cdot L i ) D. ( R b ) |
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| 109 | Q. 15 Suspension of slaked lime in water is known as (a) lime water (b) quick lime (c) milk of lime (d) aqueous solution of slaked lime |
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| 110 | Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? ( A cdot S r S O_{4} ) в. ( mathrm{CaSO}_{4} ) c. ( B e S O_{4} ) D. ( B a S O_{4} ) |
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| 111 | Q18. Describe two important uses of each of the following: (i) caustic soda (ii) sodium carbonate (iii) quick lime |
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| 112 | Assertion The mobilities of the alkali metal ions in aqueous solutions are: ( boldsymbol{L} boldsymbol{i}^{+}< ) ( boldsymbol{N} boldsymbol{a}^{+}<boldsymbol{K}^{+}<boldsymbol{R} boldsymbol{b}^{+}<boldsymbol{C} boldsymbol{s}^{+} ) Reason Greater the charge, smaller the radius, larger the hydration and thus heavier (hydrated) ion slower. 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. Both Assertion and Reason are incorrect |
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| 113 | Statement : Baking soda or baking powder is different. Answer whether the above statement is true or false. A. True B. False |
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| 114 | Raw materials used for the manufacture of Portland cement are: A. gypsum and limestone B. limestone and clay c. alumina, clay and gypsum D. gypsum and clay |
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| 115 | 0.19 Which of the following statements is true about Ca(OH)2? (a) It is used in the preparation of bleaching powder (b) It is a light blue solid (c) It does not possess disinfectant property (d) It is used in the manufacture of cement NWOO D biduude |
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| 116 | The anhydrous calcium sulphate is called : A. gypsum B. anhydrite c. plaster of Paris D. lime |
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| 117 | Itching causing ( _{-}-_{-}-_{-}- ) crystals are found in colocasia leaves. A. calcium carbonate B. calcium oxalate c. calcium sulphate D. calcium chloride |
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| 118 | The formulae of oxides formed when barium burns in presence of oxygen are: A. ( B a_{2} O, B a O ) в. ( B a O, B a O_{2} ) с. ( B a O, B a_{2} O_{2} ) D. ( B a_{2} O, B a O_{2} ) |
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| 119 | Explain how does the melting point change on moving from group- 1 to group- 2 in the periodic table? | 11 |
| 120 | Quicklime is a chemical compound known as calcium oxide ( boldsymbol{C a}(boldsymbol{O} boldsymbol{H})_{2} ) If true enter 1 ,if false enter 0 ( A cdot O ) |
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| 121 | Q. 50 When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step. tie ad indicates that |
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| 122 | Assertion The stability of peroxides and superoxides increases in passing from Li to CS. Reason The electropositive character of the elements in the periodic table increases on moving down a group. 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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| 123 | What happen when ( N a O H ) reacts with? ( N H_{4} C l ) ( N H_{4} N O_{3} ) ( left(N H_{4}right)_{2} S O_{2} ) Urea |
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| 124 | Which of the following element(s) is/are not react directly with nitrogen to form nitride ? This question has multiple correct options A . Na B. Li ( c cdot k ) D. Rb |
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| 125 | V.4 Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally? (a) MgCO, (b) Caco, (c) SrCog (d) BaCO3 |
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| 126 | The highly water soluble alkaline earth metal fluoride is: A. ( C a F_{2} ) в. ( B a F_{2} ) c. ( M g F_{2} ) D. ( B e F_{2} ) |
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| 127 | Among the following which can form ions with a ( 2+ ) charge? A . Alkali metal B. Alkaline earth metal c. Transition metal D. Halogen E. Noble gas |
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| 128 | NaOH can also be prepared by electrolysis of aqueous NaCl. Amount of NaOH formed when 0.445 L of ( mathrm{NaCl} ) (aq) is electrolysed for 137 s with a current of ( 1.08 A, ) is : A . ( 0.09 g ) B. ( 0.12 g ) c. ( 0.06 g ) D. amount of NaCl has not been given |
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| 129 | Explain, why electronegativity of Li is greater than Mg? | 11 |
| 130 | What is the chemical formula of plaster of paris? |
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| 131 | Quicklime is made by heating limestone. Which equation represents this reaction? A ( cdot C a C O_{3} rightarrow C a+O_{2}+C O ) в. ( C a C O_{3} rightarrow C a O+C O_{2} ) ( mathrm{c} cdot mathrm{CaCO}_{3}+mathrm{H}_{2} mathrm{O} rightarrow mathrm{CaO}+mathrm{H}_{2} mathrm{CO}_{3} ) D. ( C a C O_{3}+H_{2} O rightarrow C a(O H)_{2}+C O_{2} ) |
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| 132 | Which of the following is a false statement? A. Sodium oxide is more basic then magnesium oxide B. Beryllium oxide is amphoteric. C. The thermal stability of beryllium carbonate is more than that of calcium carbonate D. Lithium chloride is deliquescent. |
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| 133 | Compare hydration energy of ( B e^{2+} ) and ( boldsymbol{A} boldsymbol{l}^{3+} ) |
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| 134 | The correct sequence of thermal stability of the following carbonates is: A. ( B a C O_{3}<C a C O_{3}<S r C O_{3}<M g C O_{3} ) в. ( M g C O_{3}<C a C O_{3}<S r C O_{3}<B a C O_{3} ) c. ( B a C O_{3}<S r C O_{3}<C a C O_{3}<M g C O_{3} ) D. ( M g C O_{3}<S r C O_{3}<C a C O_{3}<B a C O_{3} ) |
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| 135 | An alkaline earth metal: A . potassium B. calcium c. lead D. copper |
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| 136 | ( x ) Liquid sodium ( quad ) Breathing apparatus metal ( quad ) submarine Potassium ( quad ) Explosive Potassium nitrate Coolant in nuclear reaction Potassium superoxide Soft soap Match the compounds/metal in(X) with their used in (Y). hence correct order is. A . A-l, B-III, C-II, D-IV B. A-III, B-IV, C-II, D-I C . A-II, B-I, C-III, D-IV D. A-IV, B-II, C-III, D-1 |
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| 137 | The discomfort caused by indigestion due to over-eating can be cured by taking: A. vinegar B. lemonjuice c. baking soda D. caustic soda |
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| 138 | Assertion NaCl is precipitated when ( H C l ) gas is passed in a saturated solution of ( N a C l ) Reason HCl is a strong 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 |
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| 139 | C. 43 Match the elements given in Column I with the colour they impart to the flame given in Column II. Column 1 Column II A Cs 1. Apple green B. Na 2. Violet CK 3. Brick red D. Ca 4. Yellow E SE 5. Crimson red E. Ва 6. Blue |
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| 140 | A solid compound ( X ) on heating give ( C O_{2} ) gas and a residue. The residue mixed with water forms ( Y . ) On passing an excess of ( C O_{2} ) through ( Y ) in water a clear solution ( Z ) is obtained. On boiling ( Z, ) compound ( X ) is reformed. The compound ( boldsymbol{X} ) is: A ( cdot operatorname{Ca}left(mathrm{HCO}_{3}right)_{2} ) в. ( C a C O_{3} ) ( mathbf{c} cdot N a_{2} C O_{3} ) D. ( K_{2} C O_{3} ) |
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| 141 | Increasing order of stability of I. ( boldsymbol{K}_{mathbf{2}} boldsymbol{C} boldsymbol{O}_{boldsymbol{3}} ) Il. ( boldsymbol{M} boldsymbol{g} boldsymbol{C} boldsymbol{O}_{3} ) ( | N a_{2} C O_{3} ) ( A ) B. II c. ॥ D. |
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| 142 | Q9. Arrange the following in the increasing order of solubility in water. MgCl, CaCl, SrCl, BaCl2 |
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| 143 | The first ionisation energy of Be is smaller than that of B while the second ionisation energy of Be is higher than that of B. Answer whether the above statement is |
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| 144 | Identify the following substances which are underlined:
An alkaline gas which produces dense white fumes when reacted with hydrogen chloride gas. |
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| 145 | The molecular formula of Baking soda is: A. ( N a H C O_{3} ) в. ( N a H C O_{3} .6 H_{2} O ) ( mathbf{c} cdot N a_{2} C O_{3} ) D. ( N a_{2} C O_{3} .10 H_{2} O ) |
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| 146 | 22. Chemical ‘A’ is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO, is bubbled through a solution of ‘A’, it turns cloudy. What is the chemical formula of A? (a) CaO (b) Ca(OH), (c) CaCO3 (d) Ca(HCO3)2 |
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| 147 | What happens when? Sodium acilate react with soda lime? | 11 |
| 148 | Q15. What do you mean by diagonal relationship in periodic table? | 11 |
| 149 | Hydrogen reacts with a metal(A) to give an ionic hydride(B). The metal (A) gives a brick red color with bunsen flame. The hydride formed is commonly known by its trade name. The compound (B) on treating with water gives back ( mathrm{H}_{2} ) and (C). Identify the metal ( A ) ( A cdot K ) B. Na a c. мg D. ca |
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| 150 | Consider the following reaction: ( boldsymbol{M}+boldsymbol{O}_{2} rightarrow boldsymbol{M} boldsymbol{O}_{2} ) ( M ) is an alkali metal ( M O_{2} ) is a stable superoxide A. ( M ) can not be ( L i ) and ( N a ) B. ( M ) can not be ( C s ) and ( R b ) c. ( M ) can not be ( L i ) and ( R b ) D. None of these |
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| 151 | How is calcium oxide prepared? A. Thermal decomposition of ( C a C O_{3} ) B. Oxidation of ( C a C O_{3} ) c. Reduction of ( C a C O_{3} ) D. None of these |
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| 152 | How chlorine react with Cold and dilute NaoH? |
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| 153 | 48. What is the chemical name of the common salt? (1) Calcium Carbonate (2) Sodium Carbonate (3) Sodium Chloride (4) None of these |
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| 154 | Which of the following is/are incorrect about solubility trend in group I and II ? This question has multiple correct options A. The solubility of the alkali metal fluorides increases on moving down the group. B. The solubility of the alkali metal hydroxides decreases on moving down the group. C. The solubility of hydroxides, fluorides and oxalates decreases from calcium to barium D. The solubility of carbonates, sulphates and chromates decreases on moving down the group. |
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| 155 | Calcium imide on hydrolysis gives a gas ( B, ) which on oxidation by bleaching powder gives a gas ( C . ) Gas ( C ) on reaction with magnesium gives a compound ( D ), which on hydrolysis again gives a gas ( B ). Hence, ( B, C ) and ( D ) are respectively: A ( cdot N H_{3}, N_{2}, M g_{3} N_{2} ) в. ( N_{2}, N H_{3}, M g N H ) c. ( N_{2}, N_{2} O_{5}, M gleft(N O_{3}right)_{2} ) D. ( N H_{3}, N O_{2}, M gleft(N O_{2}right)_{2} ) |
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| 156 | Choose the incorrect statement. ( mathbf{A} cdot B e C O_{3} ) is kept in the atmosphere of ( C O_{2}, ) since it is least thermally stable. B. ( B e ) dissolves in alkali forming ( left[B e(O H)_{4}right]^{2-} ) C ( . B e F_{2} ) forms complex ion with ( N a F ) in which ( B e ) goes with cation. D. ( B e F_{2} ) forms complex ion with ( N a F ) in which ( B e ) goes with anion. |
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| 157 | The main raw materials required for the manufacture of portland cement are: A. limestone and clay B. limestone and gpsum c. limestone and calcium chloride D. limestone and silica |
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| 158 | The lightest metal among the following is: A . cs B. Be c. Na D. Li |
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| 159 | 51 Lithium hydride can be used to prepare other useful hydrides. Beryllium hydride is one of them. Suggest a route for the preparation of beryllium hydride starting from lithium hydride. Write chemical equations involved in the process. Ans Boll be |
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| 160 | Assertion ( mathrm{CaCO}_{3} ) is prepared by passing carbon dioxide gas through slaked lime. Reason Passing excess of ( C O_{2} ) through slaked lime leads to the formation of quick lime. 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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| 161 | The four general methods of extracting metals are thermal, decomposition, displacement of one element by another, chemical reduction and electrolytic reduction. how are the group metals obtained and why are the other methods unsuitable? |
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| 162 | Which of the following is/are the raw materials used to manufacture cement? This question has multiple correct options |
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| 163 | Which salt can be used to identify coloured cation? A. Borax B. Microcosmic salt c. Both (a) and (b) D. None of these |
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| 164 | Q Type your question made to reaci with anute nul tads r is evolved in the reaction which is made to pass through the delivery tube into test tube 2 having solution ( Z ) and a milky solution is obtained What are ( X, Y ) and ( Z ) respectively? A. ( N a O H, C O_{2}, N a_{2} C O_{3} ) в. ( operatorname{Ca}(O H)_{2}, H_{2}, C aleft(H C O_{3}right)_{2} ) c ( cdot operatorname{ca}(O H)_{2}, C O_{2}, C a C O_{3} ) D ( cdot ) ( _{C a} ) a ( C ) O ( _{3}, ) C ( O_{2}, C a(O H)_{2} ) |
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| 165 | Q12. Discuss the various reactions that occur in the Solvay process. | 11 |
| 166 | Statement-I: Alkali metals dissolve in liquid ammonia to give blue solutions Statement-II: Alkali metals in liquid ammonia give solvated species of the type ( left[Mleft(N H_{3}right)_{n}right]^{+}(M=text { alkali metals }) ) A. Statement-l is true; Statement-ll is true; Statement-I is the correct explanation for Statement- B. Statement-l is true; Statement-ll is true; Statement-1 is not the correct explanation for statement- c. Statement-l is true; Statement-ll is false D. Statement-I is false; Statement-II is true |
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| 167 | un treatment wırn cola water, an element (A) reacts readily liberating a colorless, odourless gas ( (mathrm{B}) ) and ( mathrm{a} ) solution (C). Lithium is reacted with (B) yielding a solid product (D) which effervescence with water to give a strongly basic solution (E). When ( C O_{2} ) gas is bubbled through the solution ( (mathrm{C}) ) a white ppt (F) is formed but this redissolved forming solution (G) when more ( C O_{2} ) is passed. The precipitate ( (F) ) effervesced when moistened with conc. ( H C l ) and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at ( 2000^{circ} C ) give (H). Solid (H) on hydrolysis gives a gas, which on passing through ammonical |
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| 168 | Table salt becomes sticky on exposure during the rainy season. Explain. | 11 |
| 169 | In the reaction : ( boldsymbol{K}_{mathbf{4}}left[boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]+ ) ( K_{2} C O_{3} rightarrow ) the product formed is : A ( . F e C O_{3} ) в. ( K C N ) c. ( K F e C O_{3} ) D. ( K_{3}left[F e(C N)_{6}right] ) |
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| 170 | Among of alkali metals, the metal with highest ionization potential is : A. ( L ) B. Na a ( c cdot k ) D. Rb |
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| 171 | Superoxides of alkali metals act as oxidising agents while normal oxides are basic in nature. The oxide which is paramagnetic in nature due to presence of unpaired electron is : A. ( N a_{2} O_{2} ) в. ( K O_{2} ) ( mathbf{c} cdot N a_{2} O ) D. ( K_{2} O_{2} ) |
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| 172 | Some substances are commonly used for removing acidic gases. Which of the following is commonly used in the chemical industry for the removal of hydrogen sulphide from coal gas? A. Milk of magnesia B. Slaked lime c. Quick lime D. Sodium hydride |
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| 173 | When lime is added to water it reacts vigorously to form slaked lime. |
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| 174 | A metal ( X ) on heating in nitrogen gas gives a compound ( Y . ) Compound ( Y ) on treatment with ( H_{2} O ) gives a colourless gas which when passed through ( C u S O_{4} ) solution gives a blue colour. Then, compound ( Y ) is: A ( . M gleft(N O_{3}right)_{2} ) в. ( M g_{3} N_{2} ) c. ( N H_{3} ) D. ( M g O ) |
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| 175 | Sodium bicarbonate solution has ( boldsymbol{p} boldsymbol{H} ) less than 7 . State True or False: A. True B. False c. cannot be determined D. None of the above |
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| 176 | Name the three metals which react with cold water to form hydrogen gas. Support your answer with equally balanced chemical equations. |
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| 177 | ” ( K_{2} O ) is paramagnetic while ( K O_{2} a n d K_{2} O_{2} ) are diamagnetic.” Answer whether the above statement is true or false. If true enter 1 , else 0 |
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| 178 | Q2. Why alkali and alkaline earth metals cannot be obtained by chemical reduction method? Ans. Because Ilceli 111 1 |
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| 179 | Which of the following reactions is not a part of Solvay’s process for preparation of sodium carbonate? ( mathbf{A} cdot 2 N H_{3}+H_{2} O+C O_{2} rightarrowleft(N H_{4}right)_{2} C O_{3} ) B. ( left(N H_{4}right)_{2} C O_{3}+H_{2} O+C O_{2} rightarrow 2 N H_{4} H C O_{3} ) c. ( 2 N H_{4} H C O_{3} rightarrowleft(N H_{4}right)_{2} C O_{3}+H_{2} O+C O_{2} ) D. ( N H_{4} H C O_{3}+N a C l rightarrow N H_{4} C l+N a H C O_{3} ) |
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| 180 | Amphoteric hydroxides react with both alkalies and acids.Which of the following group 2 metal hydroxides is soluble in sodium hydroxide? ( mathbf{A} cdot B e(O H)_{2} ) в. ( R a(O H)_{2} ) ( mathbf{c} cdot C a(O H)_{2} ) D. ( B a(O H)_{2} ) |
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| 181 | ( C O_{2} ) gas along with solid ( (Y) ) is obtained when sodium salt ( (X) ) is heated. ( (X) ) is again obtained when ( C O_{2} ) gas is passed into aqueous solution of ( (boldsymbol{Y}) cdot(boldsymbol{X}) ) and ( (boldsymbol{Y}) ) respectively are: A ( . N a_{2} C O_{3} ) and ( N a_{2} O ) в. ( N a_{2} C O_{3} ) and ( N a O H ) c. ( N a H C O_{3} ) and ( N a_{2} C O_{3} ) D. ( N a_{2} C O_{3} ) and ( N a H C O_{3} ) |
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| 182 | Suboxide of Rb has the formula: ( mathbf{A} cdot R b O_{2} ) в. ( R b O_{3} ) ( mathrm{c} cdot R b_{2} O_{2} ) D. ( R b_{6} O ) |
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| 183 | Manufacture of which of the following does not require limestone as a raw material? A . Quick lime B. Baking soda c. Glass D. Plaster of Paris |
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| 184 | “Carnallite is ( K C l cdot M g C l_{2} cdot 6 H_{2} O ) If true enter 1 , if false enter 0 |
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| 185 | The correct order of covalent nature is: A. ( B e C l_{2}> ) LiCl в. ( B e C l_{2}<L i C l ) c. ( B e C l_{2}=L i C l ) D. None of these |
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| 186 | Lattice energy (numerical value) of choride of alkali metals is in order: A . LiCI > NaCI>KCI> RbCI> Cscl B. LiCI<NaCI<KCI<RbCI<CsCI C. NaCI<KCI <LiCI <RbCI <CsC D. NaCI<KCI<RbCI<CsCI<Lic |
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| 187 | On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur? A. Blue coloured solution is obtained B. Sodium ions are formed in solution C. Liquid ammonia becomes a good conductor of electricity D. Liquid ammonia remains diamagnetic. |
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| 188 | Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by-products are: A. ( C l_{2} ) and ( H_{2} ) B. ( C l_{2} ) and ( mathrm{Na}-mathrm{Hg} ) c. ( C l_{2} ) and ( mathrm{NaC} ) D. ( C l_{2} ) and ( O_{2} ) |
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| 189 | Chlorine atom in ( N a C l ) gets a unit negative charge: A. its nucleus has 17 protons, 18 electrons B. its nucleus has 18 protons, 17 electrons c. its nucleus has 8 protons, 7 electrons D. none of the above |
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| 190 | In the caster-Kleiner cell used for the manufacture of ( N a O H, ) the cathode in the central compartment is made up of A. carbon B. iron c. mercury D. nickel |
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| 191 | ( mathrm{CaCO}_{3} ) naturally exists in: A. one crystal form B. two crystal form c. three crystal form D. four crystal form |
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| 192 | Which compound is missing in the reaction given below? ( 2 N a O H+left(N H_{4}right)_{2} S O_{4} rightarrow ?+N a_{2} S O ) A. ( O_{2} ) в. ( H_{2} ) c. ( N_{2} ) D. ( 2 N H_{3} ) |
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| 193 | Which of the following reactions is known as slaking of lime? A ( cdot C a C O_{3} rightarrow C a O+C O_{2} ) в. ( C a O+2 H C l rightarrow C a C l_{2}+H_{2} O ) c. ( C a C O_{3}+H_{2} O rightarrow C a(O H)_{2}+C O_{2} ) D. ( C a O+H_{2} O rightarrow C a(O H)_{2} ) |
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| 194 | 07. What is dead burnt plaster? | 11 |
| 195 | Effervescence is seen when a bottle of soda water is opened A. True B. False |
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| 196 | Which of the following illustrate the anomalous properties of Lithium? This question has multiple correct options A. Lithium is softer than the other group I metals B. Lithium forms nitride, ( L i_{3} N ) unlike other group metals C. The melting and boiling point of Lithium are comparatively high D. none of these |
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| 197 | Q. 37 In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2CO3 with sodium chloride? Explain. |
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| 198 | Select the correct order of ionic conductance of the following cations in an aqueous solution. A ( . L i^{+}<N a^{+}<K^{+}N a^{+}>K^{+}>R b^{+} ) c. ( L i^{+}K^{+}>R b^{+} ) D. ( L i^{+}=N a^{+}<K^{+}<R b^{+} ) |
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| 199 | Q17. What happens when (i) magnesium is burnt in air, (ii) Quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated? |
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| 200 | “Li metal is used in photoelectric cells, while Cs is not used.”
Answer whether the above statement is |
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| 201 | Arrange the following in increasing order of lattice energy: ( mathrm{NaF}, mathrm{NaCl}, mathrm{NaBr}, mathrm{Nal} ) A. ( N a I<N a B r<N a C l< ) NaF в. ( N a F<N a C l<N a B r<N a I ) c. ( N a I<N a C l<B a B r<N a F ) D. None of these |
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| 202 | Q1. Name the alkali metal which shows diagonal relationship with magnesium? | 11 |
| 203 | Which of the following forms the most basic hydroxide? A. ( C u ) в. ( A l ) ( c . N a ) D. ( Z ) n |
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| 204 | In which of the following pair, both the substances are chemically same? A. Milk of lime and lime water B. Dead burnt plaster and gypsumm C. Alumina and gypsum D. Gypsum and Plaster of Paris |
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| 205 | ( mathrm{Zn}+mathrm{NaOH} rightarrow ) | 11 |
| 206 | Which of the following will have the largest value of solubility product, or is most soluble in water? A ( cdot operatorname{Be}(O H)_{2} ) в. ( B a(O H)_{2} ) c. ( operatorname{Ca}(O H)_{2} ) D. ( M g(O H)_{2} ) |
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| 207 | Give the missing product of the following reaction in same order of reaction order: ( boldsymbol{C a}+boldsymbol{a i r} rightarrow boldsymbol{C a O}+_{–}- ) ( boldsymbol{C a} boldsymbol{C O}_{3}(boldsymbol{s}) stackrel{Delta}{longrightarrow} boldsymbol{C a O}(boldsymbol{s})+_{–} ) (2) ( boldsymbol{C a}(boldsymbol{O} boldsymbol{H})_{2} stackrel{text {calcination}}{longrightarrow} boldsymbol{C a O}+_{–} ) ( ldots(3) ) A. ( C a_{3} N_{2} ; C O_{2} ; H_{2} O ) в. ( C a_{3} N_{2} ; C O_{2} ; H_{2} ) c. ( C a_{a} N_{2} ; operatorname{CO} ; H_{2} O ) D. ( C a F_{2} ; C O_{2} ; H_{2} O ) |
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| 208 | The pair of compounds which cannot exist together in aqueous solution is: A. ( N a_{2} C O_{3} ) and ( N a H C O_{3} ) в. ( N a H C O_{3} ) and ( N a O H ) c. ( N a O H ) and ( N a H_{2} P O_{4} ) D. Both (B) and (C) |
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| 209 | Recently, sodium naphthalenide ( left.C_{10} H_{8} N aright) ) has been used as reductant in complex formation. ( C_{10} H_{8} N a ) is : This question has multiple correct options A. paramagnetic B. deep-green in colour c. diamagnetic D. colourless |
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| 210 | Which of the following compound is the final product of Solvay process? A. Ammonium carbonate B. Ammonium bicarbonate c. sodium carbonate D. Sodium bicarbonate |
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| 211 | When sodium hydroxide solution is added to a freshly prepared solution of ferrous sulphate, a green precipitate of ferrous hydroxide is formed which on standing turns brown because: A. ferric salts are unstable B. the mixture becomes dirty c. ferrous hydroxide becomes ferric oxide D. green ferrous hydroxide oxidises to brown ferric hydroxide |
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| 212 | The metal with which hydrogen reacts to form metal hydride is: A. ( H g ) в. ( C a ) ( c . A g ) D. ( H ) |
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| 213 | Why is common salt sometimes yellow instead of being pure white? | 11 |
| 214 | ( C aleft(H C O_{3}right)_{2} ) and ( C a(O H)_{2} ) cannot be stored in the same vessel. If true enter 1 , else enter 0 . |
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| 215 | Which of the following on thermal decomposition yields a basic as well as an acidic oxide? A. ( N a N O_{3} ) в. ( K C l O_{3} ) ( mathrm{c} cdot mathrm{CaCO}_{3} ) D. ( N H_{4} N O_{3} ) |
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| 216 | Assertion Divalent compounds of alkaline earth metals are diamagnetic. Reason ( M^{2+} ) ions of group 2 have noble gas conguration. 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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| 217 | Which of the following is incorrect? A. ( M g ) burns in air releasing dazzling light rich in ( U V ) rays B. ( C a C l_{2} cdot 6 H_{2} O ) when mixed with ice gives freezing mixture c. ( M g ) cannot form complexes D. ( B e ) can form complexes due to its very small size |
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| 218 | The name of the process is : [ begin{array}{l} mathrm{caCO}_{3} longrightarrow mathrm{CaO}+mathrm{CO}_{2} \ mathrm{NH}_{3}+mathrm{H}_{2} mathrm{O}+mathrm{CO}_{2} stackrel{longrightarrow}{longrightarrow} mathrm{NH}_{4} mathrm{HCO}_{3} \ mathrm{NaCl}+mathrm{NH}_{4} mathrm{HCO}_{3} longrightarrow mathrm{NH}_{4} mathrm{Cl}+mathrm{NaHCO}_{3} \ 2 mathrm{NH}_{4} mathrm{Cl}+mathrm{CaO} longrightarrow mathrm{CaC}_{2}+2 mathrm{NH}_{3}+mathrm{H}_{2} mathrm{O} end{array} ] A. solvay B. lowing c. salt cake D. gossage |
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| 219 | Give the chemical formula of calcium sulphate hemihydrate. A ( cdot operatorname{CaSO}_{4} cdot 2 mathrm{H}_{2} ) в. ( operatorname{caSO}_{4}: frac{1}{2} H_{2} mathrm{O} ) c. ( operatorname{cas} O_{4} cdot 10 H_{2} O ) D. ( operatorname{CaSO}_{4} . mathrm{H}_{2} mathrm{O} ) |
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| 220 | Compare ( L i ) and ( B e ) according to the polarisation of cations: A ( cdot L i^{+}B e^{2} ) c. ( L i^{+}=B e^{2+} ) D. None of these |
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| 221 | ( mathbf{2} N boldsymbol{a} boldsymbol{O} boldsymbol{H}+boldsymbol{S} boldsymbol{O}_{2} rightarrow ? ) A ( cdot N a_{2} O+H_{2}+S O_{2} ) в. ( N a_{2} S O_{3}+H_{2} O ) c. ( N a_{2} S O_{3}+H_{2} ) D. ( N a_{2} O+H_{2}+O_{2} ) |
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| 222 | What are the products of the following reaction? ( boldsymbol{C a} boldsymbol{C O}_{3} stackrel{boldsymbol{Delta}}{longrightarrow} ) A. ( C O+C O_{2} ) в. ( C a O+C O ) c. ( C O_{2}+C a_{2} O ) D. ( C O_{2}+C a O ) |
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| 223 | Q. 11 In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is (a) CaCl₂ (b) NaCl (c) NaOH (d) NaHCO, |
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| 224 | What is the action of ( C o_{2} ) on quick lime. | 11 |
| 225 | Which gas is released on the addition of dilute acid to calcium carbonate? A ( . N_{2} ) в. ( C a O O ) ( c cdot C l_{2} ) D. ( N O_{2} ) E ( . C O_{2} ) |
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| 226 | The compound having lowest melting point is: A. Licl в. ( C s C l ) c ( . R b C l ) D. KCl |
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| 227 | Which of the following is the correct description of calcium oxide? A. Very stable B. Prepared by the process of calcination c. Low affinity for water D. Less efficient desiccant than silica gel |
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| 228 | Among the carbonates of alkali metals which one has highest stability: A. ( C s_{2} C O_{3} ) в. ( R b_{2} C O_{3} ) ( mathrm{c} cdot K_{2} mathrm{CO}_{3} ) D. ( N a_{2} C O_{3} ) |
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| 229 | Sodium hydrogen carbonate is used in fire extinguisher. A. True B. False |
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| 230 | Mortar is a mixture of: A. lime and water B. lime and sand C. lime, sand and water D. lime and cement |
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| 231 | Which of the following can form a super oxide very easily? A. Sodium B. Potassium c. caesium D. Lithium |
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| 232 | Q14. Why are alkali metals soft? | 11 |
| 233 | “LiI has greater solubility in water than ( boldsymbol{C} boldsymbol{s} boldsymbol{I} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 234 | Which of the following reactions correctly represent(s) the preparation of ( M g C O_{3} ? ) This question has multiple correct options ( mathbf{A} cdot M gleft(H C O_{3}right)_{2} stackrel{text {heat}}{rightarrow} M g C O_{3}+H_{2} O+C O_{2} ) B. ( M gleft(H C O_{3}right)_{2}+M g O rightarrow 2 M g C O_{3}+H_{2} O ) ( mathbf{c} cdot M g S O_{4}+2 N a H C O_{3} rightarrow M g C O_{3}+N a_{2} S O_{4}+ ) ( H_{2} O+C O_{2} ) D. None of these |
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| 235 | Which one of the following oxides is soluble in water? A. zinc oxide B. Calcium oxide c. Ferric oxide D. Ferrous oxide |
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| 236 | Assertion Fr burns in air forming ( boldsymbol{F} boldsymbol{r} boldsymbol{O}_{2} ) Reason The larger alkali metal ions stabilities ( O_{2}(text { superoxide }) ) 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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| 237 | The option(s) with only amphoteric oxides is (are): This question has multiple correct options A. ( C r_{2} O_{3}, B e O, S n O, S n O_{2} ) в. ( C r_{2} O_{3}, C r O, S n O, P b O ) c. ( Z n O, A l_{2} O_{3}, P b O, P b O_{2} ) D. ( N O, B_{2} O_{3}, P b O, S n O_{2} ) |
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| 238 | Assertion ( F r C l O_{4}, F r_{2} P t C l_{6} ) are low solubility compounds of ( boldsymbol{F r} ) Reason ( boldsymbol{F r} boldsymbol{C l O}_{4}, boldsymbol{F r}_{2} boldsymbol{P t C l}_{6} ) have larger alkali metal ion. 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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| 239 | Which of the following property(ies) of all the alkali metals increase(s) with increase in their atomic number? This question has multiple correct options A. Solubility of their hydroxides B. Thermal stability of their carbonates c. softness D. Hydration energy |
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| 240 | Sodium on heating with moist air produces: A. ( N a O ) в. маОН c. ( N a_{2} O ) D. ( N a_{2} C O_{3} ) |
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| 241 | Read the given statements and select the correct option: Statement 1:Backing soda does not Statement 2 :Bases are sour in taste |
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| 242 | Which of the following is best ( C O_{2} ) absorber as well as a source of ( O_{2} ) in the space capsule? A ( . K O_{2} ) в. ( K_{2} O_{2} ) c. КОН D. ( L i O H ) |
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| 243 | Q6. Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy, (ii) basicity of oxides, (iii) solubility of hydroxides. |
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| 244 | Property of all the alkaline earth metals that increases with their atomic number is: A. solubility of their carbonates B. thermal stability of their sulphates c. ionisation energy D. electronegativity |
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| 245 | What is ( X ) in the equation? ( boldsymbol{C a O}+boldsymbol{3 C} rightarrow boldsymbol{X}+boldsymbol{C O} ) A ( cdot C a C O_{3} ) в. ( C a C_{2} ) ( c cdot C O_{2} ) D. None of these |
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| 246 | (a) Describe how the following properties vary on descending group IA and IIA (alkali and alkaline earth metals) and state how these properties differ between the two groups? (i) ( (I E)_{1} a n d(I E)_{2} ) (ii) cationic radii (iii) rates of reaction with cold water (b) For the same s-block elements, discuss: (i) the action of heat on their nitrates (ii) the crystal structures of their chlorides, XY type only. |
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| 247 | Which of the following metals dissolves in ( K O H ) with the evolution of hydrogen? A. ( C a ) в. ( M g ) ( c cdot S r ) D. ( B e ) |
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| 248 | Q9. Why are potassium and caesium, rather than lithium used in photoelectric cells? | 11 |
| 249 | State True or False. Molten Potassium burns in air forming potassium superoxide A. True B. False |
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| 250 | If sodium chloride is added to silver nitrate solution: a. Which precipitate is formed? b. Name the type of reaction. c. Write the chemical equation. |
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| 251 | The number of covalent bonds formed by Be is: |
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| 252 | Q. 28 Which of the following are the correct reasons for anomalous behaviour of lithium? (a) Exceptionally small size of its atom (b) Its high polarising power (c) It has high degree of hydration (d) Exceptionally low ionisation enthalpy H O TO |
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| 253 | State True or False. Setting of cement is an endothermic process A. True B. False |
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| 254 | State True or False. Calcium bicarbonate is known in solid state. A. True B. False |
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| 255 | The hydration energy of ( M g^{2+} ) is greater than that of : A ( . A l^{3} ) В. ( N a^{+} ) ( c cdot B e^{2} ) D. ( M g^{3+} ) |
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| 256 | Which among the following compounds in crystalline form is used for making Nicol’s prism? A ( cdot operatorname{CaSO}_{4} ) В. ( N a_{2} A l F_{6} ) ( mathrm{c} cdot mathrm{CaCO}_{3} ) D. ( A l_{2} O_{3} ) |
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| 257 | NaOH cannot be stored in the vessel made of ( Z n ) or ( A l ) or ( B e ). Answer whether the above statement is |
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| 258 | Lattice energy of alkali metal chlorides is in order: ( boldsymbol{L i C l}>boldsymbol{N a C l}>boldsymbol{K C l}>boldsymbol{R b C l}> ) ( boldsymbol{C} boldsymbol{s} boldsymbol{C l} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 259 | Gypsum is added to cement in order to: A. prolong hydration B. increase strength after hydration c. decrease heat of hydration D. reduce curing time |
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| 260 | Cake does not taste bitter due to presence of A. sodium carbonate B. tartaric acid c. citric acid D. sodium bicarbonate |
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| 261 | Assertion Alkaline earth metal oxides are quite stable to heat. Reason Enthalpies of formation of alkaline earth metal oxides are quite high. 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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| 262 | The alkali metals dissolve in liquid ( N H_{3}, ) it is found that: A. the dilute solution is blue but the color changes to bronze with increasing concentration B. the blue color is due to presence of solvated electrons c. the blue solutions are paramagnetic but the bronze colored solutions are diamagnetic D. all the facts given above are found |
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| 263 | The insecticide chlordane is warmed with dilute NaOH solution for some time. The no. of NaOH consumed: |
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| 264 | The number of molecules of water of crystallisation present in washing soda crystals is: A . five B. two ( c . ) ten D. seven |
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| 265 | Unreacted sodium metal can be removed from liquid ammonia safely by A. distilling the mixture B. adding oil and then heating to convert ammonia to gas c. adding ammonium chloride D. none of the above |
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| 266 | The property of the alkaline earth metals which increases with their atomic number is: A. ionisation energy B. electronegativity c. solubility of their hydroxides in water D. solubility of their sulphates in water |
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| 267 | Q13. What is the general name for elements of group 1? 111. |
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| 268 | 30. Brine refers to : (1) Salt water (2) Sweet water (3) Pure water (4) Starch water |
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| 269 | Assertion ( M g ) get oxidized, when heated in ( C O_{2} ) atmosphere. Reason ( M g ) has strong affinity to oxygen. 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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| 270 | Calculate the total number of protons in 10 gms of Calcium Carbonate ( left(C a C O_{3}right) ) |
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| 271 | “Of the alkali metal carbonates, only ( L i_{2} C O_{3} ) decomposes to give ( C O_{2} ) and metal oxide.” Answer whether the above statement is |
11 |
| 272 | For the manufacture of cement various steps are given below. Arrange the steps in a proper sequence. (a) Clinker formation Crushing (c) Addition of gypsum Mixing of raw materials (e) Grinding to fine powder Calcination in rotary kiln ( A cdot d b f a c e ) B. ( b d f ) c e a c. ( d c ) a fe ( b ) D. a b c de f |
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| 273 | The chemical formula of ( X, Y ) and ( Z ) are: [ begin{array}{l} mathrm{X}+mathrm{Na}_{2} mathrm{CO}_{3} longrightarrow mathrm{Y}+mathrm{Z} \ mathrm{CO}_{2} end{array} ] ( Z(text { milky cloud }) ) ( mathbf{A} cdot C a O, C a(O H)_{2}, N a O H ) B. ( N a O H, C a O, C a C O_{3} ) ( mathbf{c} cdot N a O H, C a(O H)_{2}, C a C O_{3} ) D. ( C a(O H)_{2}, N a O H, C a C O_{3} ) |
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| 274 | The colour of caustic soda turns pink when phenolphthalein is added. A. True B. False |
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| 275 | Q29. How would you explain the following observations? (1) BeO is almost insoluble but Beso, is soluble in water (ii) BaO is soluble but Baso, is insoluble in water. (iii) Lil is more soluble than KI in ethanol. |
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| 276 | Q21. Describe the importance of the following: (1) Limestone (ii) Cement (iii) Plaster of Paris. Ang TT |
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| 277 | Rocksalt is: A. ( K C l ) в. ( C a C l_{2} ) c. ( M g C l_{2} ) D. ( N a C l ) |
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| 278 | When sample of baking soda is strongly ignited in crucible it suffered loss in weight of ( 3.1 g ) the mass of baking soda is- A. ( 16.8 g ) в. ( 8.4 g ) c. ( 11.6 g ) D. ( 4.2 g ) |
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| 279 | Which one of the following reactions is not associated with the Solvay process of manufacture of sodium carbonate? A ( . ) NaCl ( +N H_{4} C O_{3} rightarrow N a H C O_{3}+N H_{4} C l ) в. 2 NaOH ( +C O_{2} rightarrow ) Na( _{2} ) CO ( _{3}+H_{2} ) O c. ( 2 N a H C O_{3} rightarrow N a_{2} C O_{3}+H_{2} O+C O_{2} ) D. ( N H_{3}+H_{2} C O_{3} rightarrow N H_{4} H C O_{3} ) |
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| 280 | Which of the following is incorrect statement? A. The heats of hydration of the dipositive alkaline earth metal ions decrease with an increase in their ionic size B. ( N a N O_{3} ) forms ( N a_{2} O ) on heating C. Hydration energy of alkali metal ion is less than that of II ( A ) D. Alkaline earth metal ions, because of their much large charge to size ratio, exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them |
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| 281 | Be and Al show diagonal relationship and thus: This question has multiple correct options A. their oxides are soluble in alkali solution forming ( left[operatorname{Be}(O H)_{4}right]^{3-} ) B. they form complex anion ( B e F_{4}^{2-} ) and ( A l F_{6}^{3-} ) C ( cdot B e C l_{2} ) and ( A l C l_{3} ) are Lewis acid D. oxides are basic |
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| 282 | Which of the following constitute sodium chloride crystal? A. Sodium and chlorine atoms B. ( N a C l ) molecules c. Sodium ions and chloride ions D. Sodium atoms and chlorine molecules |
11 |
| 283 | Which of the following oxide is expected to react readily with NaOH? A. ( N a_{2} O ) в. ( C a O ) c. ( N O ) D. ( C l_{2} O_{7} ) |
11 |
| 284 | Observe the given chemical change and answer the following. i) Identify ‘A’ and ‘B’. ii) Write the commercial name of calcium hydroxide. iii) Identify products ‘C’ and ‘D’, when ( H C l ) is allowed to react with calcium oxide. iv) Say whether calcium oxide is acidic or basic. |
11 |
| 285 | Oxide, peroxide and superoxide – all the three can be formed by: A. ( L i, K ) в. ( N a, K ) c. ( K, R b ) D. ( N a, C s ) |
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| 286 | Compare the solubility and thermal stability of alkali metals carbonates with those of the alkaline earth metals nitrates. |
11 |
| 287 | Write equation for the reaction which take place when gas ( X ) reacts with lime water to form white precipitate ( Y ) | 11 |
| 288 | A compound ( X ) on heating gives a colorless gas. The residue is dissolved in water to obtain ( Y . ) Excess ( C O_{2} ) is bubbled through aqueous solution of ( Y ) and ( Z ) is formed. ( Z ) on gentle heating gives back ( X . ) The ( X ) is: A ( cdot C a C O_{3} ) в. ( C aleft(H C O_{3}right)_{2} ) c. ( N a_{2} C O_{3} ) D. ( N a H C O_{3} ) |
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| 289 | When sodium is heated in moist air, the ultimate product obtained is: A. ( N a_{2} O ) в. маОН c. ( N a_{2} C O_{3} ) D. ( N a_{2} O_{2} ) |
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| 290 | What happens when Chlorine gas is passed through a hot concentrated solution of ( N a O H ? ) |
11 |
| 291 | In the electrolysis of aqueous ( N a C l ) solution, side reactions taking place are : (I) ( 2 O H^{-}+C l_{2} longrightarrow 2 O C l^{-}+H_{2} ) (II) ( 2 N a+2 H_{2} O longrightarrow 2 N a O H+H_{2} ) (III) ( 4 O H^{-} longrightarrow O_{2}+2 H_{2}+4 e^{-} ) Select the correct alternate. A . ।, ॥ B. ॥, ॥ I c. ।, ॥ा D. I, II and III |
11 |
| 292 | The increasing order of solubility is : A. ( C a C O_{3}, K H C O_{3}, N a H C O_{3} ) в. ( operatorname{NaHCO}_{3, K H C O_{3}, C a C O_{3}} ) c. ( K H C O_{3}, N a H C O_{3}, C a C O_{3} ) D. ( C a C O_{3}, N a H C O_{3}, K H C O_{3} ) |
11 |
| 293 | Solvay process is used for the manufacture of : A . ( N a O H ) в. ( N a_{2} C O_{3} .10 H_{2} O ) ( mathrm{c} cdot K_{2} mathrm{CO}_{3} ) D. ( N a_{2} O_{2} ) |
11 |
| 294 | The metal ( X ) is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form colourless solid from which hydrogen is released on treatment with water. The metal is : A ( cdot ) Al B. ca ( c cdot c u ) D. zn |
11 |
| 295 | Q. 6 Metals form basic hydroxides. Which of the following metal hydroxide is the least basic? (a) Mg(OH)2 (b) Ca(OH), (c) Sr(OH)2 (d) Ba(OH)2 |
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| 296 | Quick Lime can be obtained by: A. adding hydrochloric acid to calciumm B. heating limestone in a lime kiln c. putting calcium in hot water D. none of these |
11 |
| 297 | Q9. Give the important uses of the following compounds. (1) NaHCO, (ii) NaOH |
11 |
| 298 | When plaster of paris comes in contact with water it sets into a hard mass. The composition of the hard mass is: A ( cdot operatorname{CaSO}_{4} cdot H_{2} O ) в. ( operatorname{CaSO}_{4} cdot operatorname{Ca}(O H)_{2} ) ( mathrm{c} cdot mathrm{CaSO}_{4} cdot 2 mathrm{H}_{2} mathrm{O} ) D. ( operatorname{CaSO}_{4} .2 mathrm{Ca}(mathrm{OH})_{2} ) |
11 |
| 299 | Choose the correct answer form the alternatives given Match column I with column II and |
11 |
| 300 | Q. 38 Write Lewis structure of 0, ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion? |
11 |
| 301 | Q3. Explain why BeH, molecule has a zero dipole moment although the Be-H bonds are polar. Ans The Lattic structure for BH is follows: |
11 |
| 302 | Finely powdered clay and limestone mixed with water is introduced in: A. drum mixer B. rotary kiln c. pan-type granulator D. dryer |
11 |
| 303 | Sodium is found more useful than potassium. If true enter 1 ,if false enter 0 |
11 |
| 304 | Give preparation of Calcium oxide. | 11 |
| 305 | Washing soda is : A. ( N a_{2} C O_{3} ) B. ( N a C l ) c. ( N a_{a} C O_{3} cdot 10 H_{2} O ) D. ( N a_{2} S O_{4} ) |
11 |
| 306 | Q. 26 Identify the correct formula of halides of alkaline earth metals from the following. (a) BaCl, 2H,0 (b) BaCl2-4H,0 (c) CaCl-6H,0 (d) SrCl. 4H2O |
11 |
| 307 | A burning strip of ( M g ) is introduced into a jar containing a gas. After some time, the walls of the container are coated with carbon. The gas in the container is : ( A cdot O_{2} ) в. ( N_{2} ) ( c cdot C O_{2} ) D. ( H_{2} O ) |
11 |
| 308 | The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders? A. ( N a H>L i H>K H>R b H>C s H ) в. ( L i H>N a H>K H>R b H>C s H ) c. ( C s H>R b H>K H>N a H>L i H ) D. ( K H>N a H>L i H>C s H>R b H ) |
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| 309 | Which of the following metals is required as a cofactor by all enzymes utilizing ATP in phosphate transfer? ( A cdot K ) в. са c. Na D. Mg |
11 |
| 310 | A solution of calcium in liquid ammonia when evaporated to dryness gives a complex: A. Pure ( C a ) в. ( left[mathrm{Ca}left(mathrm{NH}_{3}right)_{x}right]^{2+} ) ( c ) ( left[mathrm{Ca}left(mathrm{NH}_{3}right)_{6}right]^{2} ) D. ( C aleft(N H_{3}right)_{6} ) |
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| 311 | Chlorine gas reacts with red hot calcium oxide to give: A. bleaching powder and dichlorine monoxide B. bleaching powder and water C . calcium chloride and chlorine dioxide D. calcium chloride and oxygen |
11 |
| 312 | The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of cationic species? ( left[boldsymbol{K}^{+}, boldsymbol{C} boldsymbol{a}^{2+}, boldsymbol{M} boldsymbol{g}^{2+}, boldsymbol{B} boldsymbol{e}^{2+}right] ) A ( cdot M g^{2+}<B e^{2+}<K^{+}<C a^{2+} ) B . ( B e^{2+}<K^{+}<C a^{2+}<M g^{2+} ) C ( cdot K^{+}<C a^{2+}<M g^{2+}<B e^{2+} ) D. ( C a^{2+}<M g^{2+}<B e^{2+}<K^{+} ) |
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| 313 | Which of the following is/are not correctly matched? This question has multiple correct options |
11 |
| 314 | “Calcium and barium bicarbonates are stable only in solution and decompose on removal of water to give carbonates.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 |
11 |
| 315 | The basic character of oxides ( M g O, S r O, K_{2} O, N i O, C s_{2} O ) increase in the order: A ( . M g O>S r O>K_{2} O>N i O>C s_{2} O ) в. ( C s_{2} O<K_{2} O<M g O<S r O<N i O ) c. ( N i O<M g O<S r O<K_{2} O<C s_{2} O ) D. ( K_{2} O<N i O<M g O<S r O<C s_{2} O ) |
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| 316 | Sodium ions helps in: This question has multiple correct options A. transmission of nerve signals B. transport of sugar and amino acids into cells C. activation of different enzymes D. oxidation of glucose to produce ATP |
11 |
| 317 | When ( C O_{2} ) is passed through lime water, it turns milky. The milkiness is due to: A. ( C a C O_{3} ) в. ( C a(O H)_{2} ) ( mathrm{c} cdot mathrm{H}_{2} mathrm{O} ) D. ( C O_{2} ) |
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| 318 | Q. 24 Which of the following compounds are readily soluble in water? (a) BeSO4 (b) MgSO4 (c) BaSO4 (d) SSOA |
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| 319 | The lattice energy of the carbonates of Mg, Ca, Sr and Ba follow the order: A. ( M g C O_{3}>C a C O_{3}>S r C O_{3}>B a C O_{3} ) в. ( C a C O_{3}>S r C O_{3}>B a C O_{3}>M g C O_{3} ) c. ( B a C O_{3}>S r C O_{3}>C a C O_{3}>M g C O_{3} ) D. ( operatorname{Sr} mathrm{rCO}_{3}>mathrm{MgCO}_{3}>mathrm{CaCO}_{3}>mathrm{BaCO}_{3} ) |
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| 320 | About alkali metal – liquid ( boldsymbol{N} boldsymbol{H}_{3} ) solution which of the following statement is not true? A. Blue colour due to ammoniated electrons B. Blue colour changes to bronze on dilution due to formation of metal clusters c. with increse in concentration of alkali metals paramagnetic nature decreases due to electron electron combination D. on heating blue colour becomes colourless due to formation of metal amide and ( H_{2} ) gas |
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| 321 | The cathode in outer compartments of Castner-Kellner process is made of: A . iron B. copper c. graphite D. mercury |
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| 322 | Write equation for the reaction which take place when limestone reacts with dilute HCI. |
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| 323 | Solution of alkali metals in liquid ammonia conducts electricity due to the presence of solvated electrons. If true enter 1 , if false enter 0 . A B. c. explanation is wrong D. Liquid ammonia not conduct electricity |
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| 324 | The covalent alkaline earth metal halide ( (boldsymbol{X}=boldsymbol{C l}, boldsymbol{B r}, boldsymbol{I}) ) is: A. ( operatorname{CaX}_{2} ) в. ( operatorname{Sr} X_{2} ) ( mathbf{c} cdot B e X_{2} ) D. ( M g X_{2} ) |
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| 325 | Which of the following will have lowest value of ( boldsymbol{K}_{s p} ) at room temperature? A. ( B e(O H)_{2} ) B. ( M g(O H)_{2} ) ( mathbf{c} cdot operatorname{Ca}(O H)_{2} ) D. ( B a(O H)_{2} ) |
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| 326 | Which of the following oxides is not expected to react with sodium hydroxide? A. ( B e O ) в. ( B_{2} O_{3} ) ( c . C a O ) D. ( operatorname{si} 0_{2} ) |
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| 327 | Q4. Write the chemical formula of the following compounds. (i) Chile salt petre (ii) Marble (iii) Brine |
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| 328 | Out of the following, which is the most stable compound? A ( cdotleft[B eleft(H_{2} Oright)_{4}right]^{2+} ) В ( cdotleft[M gleft(H_{2} Oright)_{4}right]^{2+} ) ( ^{mathrm{c}} cdotleft[C aleft(H_{2} Oright)_{4}right]^{2+} ) D. ( left[operatorname{Sr}left(H_{2} Oright)_{4}right]^{2+} ) |
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| 329 | On dissolving moderate amount of sodium metal in liquid ( N H_{3} ) at low temperature, which one of the following does not occur? A. Blue coloured solution is obtained B. ( N a^{+} ) ions are formed in the solution C . Liquid ( N H_{3} ) becomes good conductor of electricity D. Liquid ammonia remains diamagnetic |
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| 330 | lime water is a solution of: A ( cdot C a(O H)_{2} ) in water B. ( C a C l_{2} ) in water c. NaOH in water D. NaCl in water |
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| 331 | “Both Li and Mg forms Basic oxides.”.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 332 | Property of the alkaline earth metals that increases with their atomic number: A. solubility of their hydroxides in water B. solubility of their sulphates in water c. ionization energy D. electronegativity |
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| 333 | The pair of amphoteric hydroxides is: A ( cdot operatorname{Be}(O H)_{2} ) and ( Z n(O H)_{2} ) B ( cdot operatorname{Al}(O H)_{3} ) and ( L i O H ) c. ( _{B}(O H)_{3} ) and ( B e(O H)_{2} ) D. ( B e(O H)_{2} ) and ( M g(O H) ) |
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| 334 | Calcium carbonate is a chemical compound with the formula ( boldsymbol{C a}left(boldsymbol{H} boldsymbol{C O}_{3}right)_{2} ) ( A cdot O ) |
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| 335 | Q6. Name the alkaline earth metals whose salt do not impart colour to a non-luminous flame. | 11 |
| 336 | Q19. Which is more basic NaOH or Mg(OH)? | 11 |
| 337 | Assertion FrCl has ( C )s ( C l ) structure with coordination number 8 Reason ( C N 8 ) is favoured by the large cation size. Read the above assertion and reason |
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| 338 | Gas ( (X) ) turns lime water milky. Gas ( (X) ) also turns acidied ( K_{2} C r_{2} O_{7} ) green. ( (X) ) is : A ( . C O ) в. ( C O_{2} ) ( c cdot s O_{2} ) D. none of these |
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| 339 | Setting of mortar is the result of reaction between slaked lime and ( C O_{2} ) of air. A. True B. False |
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| 340 | Which of the given alkaline earth metal is hardest of all alkaline earth metals? ( A cdot ) Mg B. ca c. Ве D. sr |
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| 341 | ( M_{2} O_{3} ) (sesquoxides) is paramagnetic in nature. It is due to presence of : A. peroxide ion. B. superoxide ion. c. oxide ion D. all of these |
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| 342 | Which one of the following hydroxide is insoluble in water? ( mathbf{A} cdot C a(O H)_{2} ) B. ( B a(O H)_{2} ) ( mathbf{c} cdot B e(O H)_{2} ) D. ( M g(O H)_{2} ) |
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| 343 | Q6. (a) What makes lithium to show properties uncommon to the rest of the alkali metals? (b) When is a cation highly polarising? Which alkali metal cation has the highest polarising power? |
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| 344 | Statement-1: Lithium chloride is predominately covalent compound. Statement-2: Electronegativity difference between Li and Cl is small. 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 |
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| 345 | Q7. Why are ionic hydrides of only alkali metals and alkaline earth metals are known? Give two examples. |
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| 346 | The common name, “cream of tartar” refers to: ( mathbf{A} cdot K H C_{4} H_{4} O_{6} ) ( mathbf{B} cdot K(S b O) C_{4} H_{4} O_{6} ) ( mathbf{c} cdot K N a C_{4} H_{4} O_{6} ) D. ( M g_{2}(O H)_{2}left(C_{4} H_{4} O_{6}right) H_{2} O ) |
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| 347 | Sodium metals are kept in kerosene oil Why? |
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| 348 | At high temperature, nitrogen combines with ( C a C_{2} ) to give: A. calcium cyanide B. calcium cyanamide c. calcium carbonate D. calcium nitride |
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| 349 | Which of the following statements is true about IIA group elements? A. All form nitrides in air. B. ( B e ) is amphoteric c. ( M H_{2} ) is ionic salt-like hydride. D. All are correct. |
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| 350 | Calcium hydroxide is found in: A. window cleaner B. soap c. lime water D. milk of magnesia |
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| 351 | Match the column. | 11 |
| 352 | Q17. Why do alkali metals give characteristic flame colouration? | 11 |
| 353 | What is slaked lime? | 11 |
| 354 | Cancer is a disease where body cells grow unchecked. A protein found in the body interferes with the growth of cancer cells. It is used for the treatment of cancer. Identify it A. Haemoglobin B. casein c. Keratin D. Interferon |
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| 355 | Among the following, the diamagnetic compound is/ are: This question has multiple correct options A. ( N a_{2} O_{2} ) в. ( O_{3} ) ( c cdot N_{2} O ) D. ( K O_{2} ) |
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| 356 | Assertion BaCO ( _{3} ) is more soluble in ( H N O_{3} ) than in plain water. Reason Carbonate is a weak base and reacts with the ( H^{+} ) from the strong acid causing the barium salt to dissociate. 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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| 357 | The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to: A. ionic nature of lithium fluoride B. high lattice enthalpy c. high hydration enthalpy for lithium ion D. low ionisation enthalpy of lithium atom |
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| 358 | .1 The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C? (a) Na (b) K (c) Rb (d) Cs en |
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| 359 | Identify A to in the following sequence of reaction. ( boldsymbol{N} boldsymbol{a}+boldsymbol{O}_{2} rightarrow(boldsymbol{A}) stackrel{boldsymbol{H} C l}{rightarrow} ) ( (B) frac{e t h e r}{H^{+} / K_{2} C r_{2} O_{7}} C ) ( C ) is forms blue colour in ethereal solution. A ( cdot ) A: ( N a_{2} O_{2}, ) B ( : H_{2} O, c: C r O_{3} ) B. A: ( N a O_{2}, ) В ( : H_{2} O_{2}, mathrm{C}: C r_{2} O_{7} ) c. ( A: N a_{2} O_{2}, B: H_{2} O_{2}, c: C r O_{3} ) D. A: ( N a O, ) В ( : H_{2} O, c: C r O_{3} ) |
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| 360 | Pick out the false statement: This question has multiple correct options A. the electropostive character of alkali metals decreases with increases in atomic number B. lithium is a hard metal and cannot be cut with a knife C. Alkali metals are strong reducing agents D. the electro-negativities of all alkali metals remain the same. |
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| 361 | Sodium hydroxide reacts with ( S O_{2} ) in aqueous medium to give: A. ( operatorname{NaHSO}_{3} ) в. ( N a_{2} S_{2} O_{3} ) ( mathbf{c} cdot operatorname{NaH} S O_{4} ) D. ( N a_{2} S O_{3} ) |
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| 362 | The first ionization potentials ( (e V) ) of ( B e ) and ( B ) respectively are: A. 8.29,9.32 В. 9.32,9.32 c. 8.29,8,29 D. 9.32,8.29 |
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| 363 | Lithium halide that is least soluble in water has a molecular mass (rounded to nearest integer) |
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| 364 | The formation of ( C a O ) from lime stone is favoured by: A. adding flux B. removing ( C O_{2} ) c. adding methyl D. adding ( C a ) |
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| 365 | 48. Caustic soda is : (1) deliquescent (2) oxidant (3) reductant (4) efflorescent |
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| 366 | Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally? A. ( M g C O_{3} ) в. ( C a C O_{3} ) ( mathrm{c} cdot operatorname{Sr} mathrm{CO}_{3} ) D. ( B a C O_{3} ) |
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| 367 | A sanitary worker uses a white chemical having strong smell of chlorine gas to disinfect the water tank ¡) Identify the chemical compound. ii) Write its chemical formula iii) Write chemical equation for preparing it |
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| 368 | Which of the following statement is false regarding sodium? A. It takes the oxidation state +1 B. It reacts with water to form a basic solution C. It forms metallic bonds in its solid uncombined form D. It is found in nature as a diatomic gas E. It reacts with a halogen to form an ionic salt |
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| 369 | Nitrolim is a: A. mixture of calcium carbide and nitrogen B. mixture of calcium cyanamide and carbon C. mixture of calcium cyanide and carbon D. mixture of ( N H_{4} C N ) and ( C a C N ) |
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| 370 | In the synthesis of sodium carbonate, the recovery of ammonia is done by treating ( N H_{4} C l ) with ( C a(O H)_{2} ) The by-product obtained in this process is: A. ( C a C l_{2} ) в. ( N a C l ) c. ( N a O H ) D. ( operatorname{NaH} mathrm{CO}_{3} ) |
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| 371 | Q5. What happens when crystals of washing soda are exposed to air? | 11 |
| 372 | What is the order of mobilities of the alkali metal ions in aqueous solution? ( mathbf{A} cdot L i^{+}>N a^{+}>K^{+}>C s^{+}>R b^{+} ) B. ( N a^{+}<L i^{+}<K^{+}<R b^{+}K^{+}>N a^{+}>R b^{+}>C s^{+} ) D. ( L i^{+}<N a^{+}<K^{+}<R b^{+}<C s^{+} ) |
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| 373 | The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are: A ( cdot C l O^{-} ) and ( C l O_{3}^{-} ) в. ( C l O_{2}^{-} ) and ( C l O_{3}^{-} ) c. ( C l^{-} ) and ( C l O^{-} ) D. ( C l^{-} ) and ( C l O_{2}^{-} ) |
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| 374 | You may have noticed that chicken-egg is very strong along its long axis so much so that it does not break even when pressed very hard. Which of the following is the main constituent of egg-shell? A. ( operatorname{CaSO}_{4} cdot 2 mathrm{H}_{2} mathrm{O} ) B. ( C a S O_{4} cdot frac{1}{2} H_{2} O ) ( mathrm{c} cdot operatorname{casio}_{3} ) ( mathrm{D} cdot mathrm{CaCO}_{3} ) |
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| 375 | R. 42 Match the compounds given in Column I with their uses mentioned in Column II. Column Column II A. CaCO₃ 1. Dentistry, ornamental work B. Ca(OH), 2. Manufacture of sodium carbonate from caustic soda C. CaO 3. Manufacture of high quality paper D. Caso 4. Used in white washing |
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| 376 | For the following reaction, identify the gaseous product formed. ( boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C O}_{3}+ ) ( boldsymbol{H} boldsymbol{C l} rightarrow ) A ( . C O ) в. ( C O_{2} ) ( c cdot O_{2} ) D. ( H_{2} O ) |
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| 377 | ( (X),(Y),(Z) ) are elements in the third period. Oxide of ( (X) ) is ionic, that of ( (Y) ) is amphoteric, and of ( (Z) ) a giant molecule. ( (X),(Y) ) and ( (Z) ) will have atomic numbers in the order: ( A cdot(x)<(y)<(z) ) ( B cdot(z)<(Y)<(X) ) ( c cdot(x)<(z)<(y) ) ( D cdot(Y)<(X)<(Z) ) |
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| 378 | In the following sequence of reactions, identify the end product (D). ( N a_{2} C O_{3} stackrel{S O_{2}}{rightarrow}(A) stackrel{N a_{2} C O_{3}}{longrightarrow}(B) ) Elemental ( S, Delta ) ( (boldsymbol{C}) stackrel{boldsymbol{I}_{2}}{rightarrow}(boldsymbol{D}) ) A ( cdot N a_{2} S O_{4} ) в. ( N a_{2} S_{4} O_{6} ) c. ( N a_{2} S ) D. ( N a_{2} S_{2} O_{3} ) |
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| 379 | Match the cations from List I with their properties in List II. |
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| 380 | When carbon monoxide is passed over solid caustic soda heated to ( 200^{circ} mathrm{C} ), it forms: A. ( N a_{2} C O_{3} ) в. ( mathrm{NaHCO}_{3} ) c. ( H C O O N a ) D. ( C H_{3} ) COONa |
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| 381 | State whether the given statement is True or False.
Statement : Sodium nitrate on heating |
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| 382 | Name of the process. ( A cdot ) Solvay B. Ammonia-soda C. Both (A) & (B) correct D. None of the above |
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| 383 | Assertion ( L i^{+} ) forms series of trihydrates ( L i X ) ( mathbf{3} boldsymbol{H}_{mathbf{2}} boldsymbol{O}[boldsymbol{X}= ) ( boldsymbol{C l}, boldsymbol{B r}, boldsymbol{I}, boldsymbol{C l O}_{2}, boldsymbol{C l o}_{4}, boldsymbol{M n O}_{4}, boldsymbol{N O}_{3}, boldsymbol{b} ) Reason This is due to its smaller size ( left(L i^{+}right) ) and highest ion dipole interaction. 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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| 384 | Which one of the following is correct with respect to molar ionic conductance of ions in aqueous solution? ( mathbf{A} cdot L i^{+}<N a^{+}<K^{+}<R b^{+} ) B ( cdot R b^{+}<K^{+}<N a^{+}<L i^{+} ) ( mathbf{c} cdot S r^{2+}<C a^{2+}<M g^{2+}<B e^{2+} ) D. ( N a^{+}<K^{+}<L i^{+}<R b^{+} ) |
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| 385 | Identify which contributes for strengthening of lime mortar structures and contributes for weakening of RCC structures the factor(s) A. Usage of water containing dissolved salts B. Addition of lime C. Absorption of ( C O_{2} ) from atmospheric air D. Both B and C |
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| 386 | Q5. Explain why is sodium less reactive than potassium. | 11 |
| 387 | Following are the ionisation potential values of : ( left(I_{1}right) 899 k J m o l^{-1},left(I_{2}right) 1757 k J m o l^{-1},left(I_{3}right. ) A. Na B. c. Ве D. Ne |
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| 388 | The substance not likely to contain ( boldsymbol{C a C O}_{3} ) is : A. calcined gypsum B. sea shells c. dolomite D. a marble statue |
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| 389 | Which of the following is not hygroscopic? A. ( mathrm{NaCl} ) в. ( mathrm{MgCl}_{2} ) c. ( mathrm{caCl}_{2} ) D. LiCl |
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| 390 | Q. 47 Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics. (a) Tendency to form ionic/covalent compounds (b) Nature of oxides and their solubility in water (c) Formation of oxosalts (d) Solubility of oxosalts (e) Thermal stability of oxosalts nrndominanthionic but less ionic than |
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| 391 | Molten sodium is used in nuclear reactors to: A. absorb neutrons in order to control the chain reaction B. slow down the fast neutrons C. absorb the heat generated by nuclear fission D. extract radio -isotopes produced in the reactor |
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| 392 | Q. 29 How do you account for the strong reducing power of lithium in aqueous solution? di torms of |
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| 393 | Q. 33 Name an element from group 2 which forms an amphoteric oxide and a water soluble sulphate. |
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| 394 | ( ” N a_{2} C O_{3} ) is more thermally stable than ( boldsymbol{L} boldsymbol{i}_{2} boldsymbol{C} boldsymbol{O}_{3} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 395 | heated on the flame directly. It crumbled to give white powder of calcium oxide. After cooling, when water is added to it a hissing sound is heard and water started boiling. If it is allowed to stay over night, a clear solution (top layer) is taken and for this experiment below as lime water.
When carbon dioxide is bubbled into |
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| 396 | What happens when: (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated |
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| 397 | A mixture of cement, gravel, coarse sand and water is called: A. mortar B. concrete c. slurry D. hardner |
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| 398 | Write a balanced chemical equation for the following:
Flowers of sulphur boiled with calcium |
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| 399 | HILI LUDUILUUUU Q14. Why is Li,co, decomposed at a lower temperature whereas Na,Co, at higher temperature? bd Therefore |
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| 400 | Q4. Which electrolyte is used to obtain sodium in Castner’s process? | 11 |
| 401 | heated on the flame directly. It crumbled to give white powder of calcium oxide. After cooling, when water is added to it a hissing sound is heard and water started boiling. If it is allowed to stay over night, a clear solution (top layer) is taken and for this experiment below as lime water. When carbon dioxide is bubbled into |
11 |
| 402 | Alkali metals (M) dissolve in liquid ( N H_{3} ) to give: A ( cdot M N H_{2} ) в. ( M H ) C ( cdotleft[Mleft(N H_{3}right)_{x}right]^{+}+left[eleft(N H_{3}right)_{y}right] ) D. ( M_{3} N ) |
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| 403 | In the following reactions ( boldsymbol{M} boldsymbol{g}+boldsymbol{a i r} underset{rightarrow}{longrightarrow}(boldsymbol{A})+(boldsymbol{E}) ) ( (A)+H_{2} O rightarrow(B) C O_{2}(C) ) ( (boldsymbol{E})+boldsymbol{H}_{2} boldsymbol{O} rightarrow(boldsymbol{D})+(boldsymbol{B}) ) mole of (B) neutralises 2 moles of HCl. (A) to (E) are ( (A): M g O(B) ) ( boldsymbol{M} boldsymbol{g}(boldsymbol{O} boldsymbol{H})_{2}(boldsymbol{C}): boldsymbol{M} boldsymbol{g} boldsymbol{C} boldsymbol{O}_{3}(boldsymbol{D}) ) ( boldsymbol{N} boldsymbol{H}_{3}(boldsymbol{E}): boldsymbol{M} boldsymbol{g}_{3} boldsymbol{N}_{2} ) If true enter ( 1, ) else enter 0 |
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| 404 | Choose the correct answer form the alternatives given. When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals. Which of the following observations regarding the reaction are correct? (i) Dilute solution are bright blue in colour due to solvated electrons. (ii) These solutions decompose to form amides and hydrogen. (iii) From this solution the ammoniates ( left[Mleft(N H_{3}right)_{6}right]^{2+} ) can be recovered by evaporation A. only (i) and (ii) B. Only (i) and (ii) and (iii) c. only (ii) and (iii) D. only (i) |
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| 405 | Which of the bicarbonates does not exist in solid state? A. ( N a H C O_{3} ) в. ( K H C O_{3} ) c. ( operatorname{Ca}left(H C O_{3}right)_{2} ) D. ( R b H C O_{3} ) |
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| 406 | Oxidation state of oxygen in ( K O_{2} ) is : A . 0 B. – ( c cdot-frac{1}{2} ) D. – |
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| 407 | The molecular formula of gypsum is : A. ( operatorname{CaSO}_{4} . mathrm{H}_{2} mathrm{O} ) в. ( operatorname{CaSO}_{4} .2 mathrm{H}_{2} mathrm{O} ) ( mathrm{c} cdot 2 operatorname{CaSO}_{4} cdot mathrm{H}_{2} mathrm{O} ) D. ( operatorname{CaSO}_{4} .3 mathrm{H}_{2} ) |
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| 408 | Nature of ( C O ) when it reacts with NaOH is acidic. State True or False: A . true B. false c. neither true nor false D. none of the above |
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| 409 | 50. Soda ash is the name for : (1) Sodium bicarbonate (2) Hydrated sodium carbonate (3) Sodium hydroxide (4) Anhydrous sodium carbonate |
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| 410 | When ( N a N O_{2} ) is heated in absence of air the products is/are? This question has multiple correct options A ( cdot ) NaNO ( _{3} ) В. ( N a_{2} O ) ( c cdot N_{2} ) D. ( O_{2} ) |
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| 411 | Which of the following statement gives the correct explanation of the fact that solubility of alkali metal fluorides increases down the group? A. Hydration energy increases and lattice energy decreases down the group B. Both energy decrease down the group but decrease in hydration energy is rapid. c. Both energy decrease down the group but decrease in lattice energy is more D. Both energy increase down the group but increase in hydration energy is rapid. |
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| 412 | “KO ( _{2} ) is ( O_{2} ) absorber and ( C O_{2} ) producer.” It is also used in submarines.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 413 | Why are the group I metals soft, low melting and of low density? | 11 |
| 414 | Q. 16 Which of the following elements does not form hydride by direct heating with dihydrogen? (a) Be (b) Mg (c) Sr (d) Ba |
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| 415 | Acetic acid was added to a solid ( X ) taken in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which did not turn milky. However, the gas burnt with a pop sound. It was concluded that A. Solid ( x ) is sodium and the gas evolved is ( C O_{2} ) B. Solid X is sodium and the gas evolved is ( H_{2} ) c. solid ( x ) is sodium acetate and the gas evolved is ( C O_{2} ) D. Solid ( x ) is sodium chloride and the gas evolved is ( H_{2} ) |
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| 416 | Assertion The mobility of sodium ion is lower than that of potassium ion. Reason The ionic mobilities depend on the effective radius of the ion. 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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| 417 | A chemistry student trying to detect the metallic ion in a salt makes a paste on the clean ( P t ) wire-loop of the salt with concentrated ( H C l . ) When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the color of the flame changes to grassy green. He should, therefore, conclude that the metal is: A. ( M g ) в. ( C a ) c. ( B a ) D. ( R a ) |
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| 418 | Which of the following does not form peroxides? ( A . B a ) в. ( B e ) ( c . C a ) D. ( M g ) |
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| 419 | ( K O_{2}( ) potassium superoxide ) is used in oxygen cylinders in space and submarines because, it : This question has multiple correct options |
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| 420 | Which of the following is known as fusion mixture? A. mixture of ( N a_{2} C O_{3}+N a H C O_{3} ) в. ( N a_{2} C O_{3}+10 H_{2} O ) c. mixture of ( K_{2} C O_{3}+N a_{2} C O_{3} ) D. ( N a H C O_{3} ) |
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| 421 | Q20. The Indroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain. |
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| 422 | Which of the following has highest melting point? A. Magnesium B. Barium c. Calcium D. Beryllium |
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| 423 | Read the following passage and answer the questions at the end of it. Dilute solution of alkali metals in liquied ( N H_{3} ) is blue. It is the ammoniated electron which is responsible for the blue color of the solution and the electrical conductivity is due to the ammoniated cation, ( left[boldsymbol{M}left(boldsymbol{N} boldsymbol{H}_{3}right)_{x}right]^{+} ) as well as the ammoniated electron, ( left[eleft(N H_{3}right)_{y}right]^{-} ) values of ( x ) and ( y ) depend on the extent of solvation ( left(b y N H_{3}right) . ) Dilute solutions are paramagnetic due to free electrons. What happens if alkali metal is allowed to react with concentrated ammonia solution? A. Paramagnetic character of solvated electrons is retained B. Solvated electrons associate to form electron-pairs and paramagnetic character decreases C. Reducing character is increased D. Reducing character is not affected |
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| 424 | Choose the correct answer form the alternatives given. Match the column I with column II and mark the appropriate choice. Column I Column I (A) Quick lime (i) Setting fractured bones (B) Plaster of Paris (ii) A constituent of gum chewing Manufacture Slaked lime O ( (c) ) (iii) bleaching powder (D) limestone (iv) Manufacture of dyestuffs A ( cdot(A) rightarrow(i),(B) rightarrow(i v),(C) rightarrow(i i),(D) rightarrow(i i i) ) B. ( (A) rightarrow(i v),(B) rightarrow(i),(C) rightarrow(i i i),(D) rightarrow(i i) ) c. ( (A) rightarrow(i i),(B) rightarrow(i i i),(C) rightarrow(i),(D) rightarrow(i v) ) ( D ) ( (i i i),(B) rightarrow(i i),(C) rightarrow(i v),(D) rightarrow(i) ) |
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| 425 | Statement I: Cl and Na form an ionic bond. Statement II: Cl donates an electron to |
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| 426 | The nitrate (A) can be confirmed by flame test. The colour imparted by the salt to the flame is : |
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| 427 | Q2. What is the effect of heat on the following compounds (Give equations for the reactions)? (1) CaCO; (ii) CaSO4 2H,0 |
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| 428 | The metal used in solar cells is: A. Na B. Li ( c cdot c s ) D. Mg |
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| 429 | Which of the following sodium compound(s) are formed when an organic compound containing both nitrogen and sulphur is fused with sodium? A. Cyanide and sulphide B. Thiocyanate c. Sulphite and cyanide D. Nitrate and sulphide |
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| 430 | Q. 20 A chemical A is used for the preparation of washing soda to recover ammonia. When Co, is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A? (a) Ca(HCO3)2 (b) Cao (c) Ca(OH)2 (d) CaCO3 U is used |
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| 431 | Filtrate ( A ) contains: ( mathbf{A} cdot N H_{4} C l ) ( mathrm{B} cdot mathrm{Na}_{2} mathrm{CO}_{3} ) ( mathbf{c} cdot N a H C O_{3} ) ( mathbf{D} cdot C a C O_{3} ) |
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| 432 | Q22. Why are lithium salts commonly hydrated and those of the other alkali metal ions usuall.. anhydrous ? |
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| 433 | When moderate amount of sodium metal is dissolved in liquid ( N H_{3} ) at low temperature, which one of the following ( operatorname{occur}(s) ? ) This question has multiple correct options A. Blue colored solution is obtained B. ( N a^{+} ) ions are formed in the solution C . Liquid ( N H_{3} ) becomes good conductor of electricity D. Liquid ( N H_{3} ) remains diamagnetic. |
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| 434 | Assertion Be and Mg do not impart characteristic colour to the flame. Reason Both Be and Mg have high ionization 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 |
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| 435 | Arrange Li, Na, K, Rb, Cs in order of increasing electron-affinity: A. ( C s<R b<K<N a<L i ) в. ( K<N a<C s<R b<L i ) c. ( C s<K<R b<L i<N a ) D. None of these |
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| 436 | ( ” L i_{2} C O_{3} ) decomposes into ( C O_{2} ) and ( L i_{2} O ) but other alkali carbonates are thermally stable.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 437 | Thus, lithium shows similarities to magnesium and beryllium to aluminium in many of their properties. This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table. The diagonal relationship is due to the similarity in ionic sizes and / or charge / radius ratio of the elements. |
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| 438 | Alkali metals dissolve in ammonia to give a blue solution which is conducting in nature due to: A. ammoniated electrons B. loss of electrons c. ammoniated cations D. both ( A ) and ( C ) |
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| 439 | Why are lithium salts commonly hydrated and those of the other alkali ions usually anhydrous? |
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| 440 | Which of the following metals on treatment with alkali will liberate ( boldsymbol{H}_{2} ) gas? This question has multiple correct options A. Be B. sn c. Ga D. In |
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| 441 | Which of the following is/ are correct statement(s)? A. Portland cement is the most commonly used cement for construction work. B. Portland cement is made from raw material which consist of ( 60 % ) lime (calcium oxide), ( 25 % ) silica (silicon dioxide), ( 5 % ) alumina. The rest is iron oxide and gypsum (calcium sulphate) C . Portland cement gets its name from the stone quarried from the Isle of Portland in England which has a similar texture. D. All of the above |
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| 442 | Which of the following hydroxides is most basic? ( mathbf{A} cdot operatorname{Be}(O H)_{2} ) B. ( B a(O H)_{2} ) ( mathbf{c} cdot C a(O H)_{2} ) D. ( M g(O H)_{2} ) |
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| 443 | Carbon dioxide gas turns limewater milky. A . True B. False |
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| 444 | Explain the difference in reactivity of the group I metals with water. | 11 |
| 445 | Among ( K O_{2}, A l O_{2}^{-}, B a O_{2} ) and ( N O_{2}^{+} ) unpaired electron is present in : A. ( N O_{2}^{+} ) and ( B a O_{2} ) B. ( K O_{2} ) and ( A l O_{2}^{-} ) c. ( K O_{2} ) only D. ( B a O_{2} ) only |
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| 446 | Select the correct statement(s): This question has multiple correct options A. Sodium can be prepared by the electrolysing aqueous solution of ( mathrm{NaCl} ) B. Sodium can be prepared by the electrolysing fused NaCl C. Sodium is a strong oxidising agent D. Sodium is soluble in liquid ammonia |
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| 447 | Find the number of peroxide molecule(s) in the following: ( M g O, C a O, L i_{2} O, B a O_{2} ) |
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| 448 | Dead burnt plaster is : A. ( operatorname{CaSO}_{4} ) в. ( operatorname{CaSO}_{4} .12 mathrm{H}_{2} mathrm{O} ) ( mathrm{c} cdot mathrm{CaSO}_{4} cdot mathrm{H}_{2} mathrm{O} ) D. ( operatorname{CaSO}_{4} .2 mathrm{H}_{2} ) |
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| 449 | Q2. State as to why (a) Alkali metals show only +1 oxidation state. (b) Na and K impart colour to the flame but Mg does not. (c) Lithium on being heated in air mainly forms the monoxide and not the peroxide. (d) Li is the best reducing agent in aqueous solution. |
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| 450 | Which of the following is preferentially formed on reaction of oxygen and potassium? A ( cdot K_{2} O_{2} ) в. ( K O_{2} ) ( mathrm{c} cdot mathrm{K}_{2} mathrm{O} ) D. ( K_{2} O_{3} ) |
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| 451 | The elements in Group 17 of the Periodic Table are called the halogens. They form stable compounds with both metals and non-metals. The table gives some data about [ F_{2}, H C l text { and } C a F_{2} ] ( boldsymbol{H C l} ) ( boldsymbol{F}_{2} ) Boiling point/ ( K ) ( 85 quad 188 ) relative form 38.0 36.5 mass Explain why ( C a F_{2} ) has a very high boiling point. |
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| 452 | Quick lime is: A. ( C aleft(H C O_{3}right)_{2} ) в. ( C a C O_{3} ) ( mathbf{c} cdot operatorname{Ca}(O H)_{2} ) D. ( C a O ) |
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| 453 | Which among the following sets of compounds is used as raw material for the preparation of sodium carbonate by solvay process? A. ( N a O H, H C l, C O_{2} ) в. ( N H_{4} C l, H_{2} O, N a C l ) c. ( N a C l, N H_{3}, C a(O H)_{2} ) D. ( N a C l, C a C O_{3}, H_{2} S O_{4} ) |
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| 454 | A substances A reacts with another substances B to produce the product ( C ) and a gas D. If a mixture of the gas ( D ) and ammonia is passed through an aqueous solution of ( mathrm{C} ), baking soda is formed. The substances ( A ) and ( B ) are: A . ( H C l ) and ( N a O H ) B. ( H C l ) and ( N a_{2} C O_{3} ) c. ( N a ) and ( H C l ) D. ( N a_{2} C O_{3} ) and ( H_{2} O ) |
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| 455 | Mg burns in air to form two compound (A) and (B). (A) is sparingly soluble in water and the resulting solution is weakly basic. (B) dissolve in water to form (C) and gas (D) with dilute ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) gives (E). E on heating gives gas (F) which behaves as an oxidising agent too. Gas ( F ) on reaction with phosphorus produce an important dehydrating agent (G). The compound G is: ( mathbf{A} cdot P_{4} O_{10} ) ( mathbf{B} cdot H P O_{3} ) ( mathbf{c} cdot P C l_{5} ) D. ( P_{4} O_{6} ) |
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| 456 | Select the correct statement about: ( A g F, C a F_{2}, B e F_{2}, M g F_{2} ) A ( cdot ) AgF and ( B e F_{2} ) are soluble, and ( C a F_{2} ) and ( M g F_{2} ) are insoluble in water. B. AgF is soluble, others insoluble c. ( mathrm{AgF} ) is insoluble, others are soluble. D. All are insoluble |
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| 457 | (Magnesium/Chlorine) oxide is used for the lining of steel making furnace. |
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| 458 | Give the chemical name ( & ) formula of chloride of lime. what happens when it is exposed to air. Write Chemical equation. |
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| 459 | What chemicals are obtained industrially from sodium chloride? Outline the process. |
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| 460 | Hot air is blown from which side of a rotary kiln at ( 1873 mathrm{K} ) to manufacture cement? A. Mlddle B. Lower c. Top D. No air is blown |
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| 461 | In epsom salt, the number of molecules of water directly coordinated with ( M g^{2+} ) ion are : ( A cdot 2 ) B. 4 ( c cdot 6 ) D. |
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| 462 | What happens when a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide? Write the equation of the reaction takes place. |
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| 463 | 8.9 The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of Lif in water is due to (a) ionic nature of lithium fluoride (b) high lattice enthalpy (c) high hydration enthalpy for lithium ion (d) low ionisation enthalpy of lithium atom |
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| 464 | Baking powder used to make a cake is a mixture of ( operatorname{starch}, N a H C O_{3} ) and ( boldsymbol{C} boldsymbol{a}left(boldsymbol{H}_{2} boldsymbol{P} boldsymbol{O}_{4}right)_{2} . ) The function of ( boldsymbol{C a}left(boldsymbol{H}_{2} boldsymbol{P} boldsymbol{O}_{4}right)_{2} ) is: A ( cdot ) to slow down the release of ( C O_{2} ) B. being acidic in nature and give ( C O_{2} ) when moistened with ( N a H C O_{3} ) ( c . ) to act as a fille D. none of these |
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| 465 | Beautiful, lake colours are formed by dyes with mordants, which paste the dye to the cloth or fabric. Which of the following is a mordar used in dying? A . Calcium carbonate B. Aluminium sulphate c. Calcium hydroxide D. zinc phosphate |
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| 466 | Portland cement is manufactured by using: A. Limestone, clay and sand B. Limestone, gypsum and sand c. limestone, gypsum and alumina D. limestone, clay and gypsum |
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| 467 | Select correct alternates(s). This question has multiple correct options ( mathbf{A} cdot operatorname{In} N a H C O_{3}, ) the ( H C O_{3}^{-} ) ions are linked into infinite chain B. ( ln K H C O_{3} ), a dimer is formed by H-bonding C ( cdot ln N a H C O_{3}, ) a dimer is formed by H-bonding D. ( ln K H C O_{3} ), the ( H C O_{3}^{-} ) ions are linked into infinite chain |
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| 468 | match the elements given in Column I with the properties mentioned in Column II. Column! Column Il A. Li 1. Insoluble sulphate B. Na 2. Strongest monoacidic base C. Ca 3. Most negative E value among alkali metals D. Ba 4. Insoluble oxalate 5 6souter electronic configuration |
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| 469 | Which of the following compounds is used as drying agent? A. Calcium Oxide B. Gypsum c. calcium chloride D. None of the above |
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| 470 | ( I_{2} ) dissolve in ( K I ) solution due to formation of: ( mathbf{A} cdot K I_{2} ) and ( I^{-} ) B. ( K^{+} ; I^{-} ) and ( I ) ( c cdot I_{3}^{-} ) D. None of the above |
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| 471 | The function of quick lime mixture is to: A. Absorb moisture present in sodalime B. increase the efficiency of soda lime C. Increase the pH of sodalime D. Take part in reaction with NaOH |
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| 472 | State whether the following statement is true or false. Reactivity and reducing power decreases on going from group 1 to group 2. A. True B. False |
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| 473 | Which of the following compound cannot be thermally decomposed even at high temperature? A. ( C s H C O_{3} ) в. ( R b_{2} C O_{3} ) ( mathrm{c} cdot L i_{2} mathrm{CO}_{3} ) D. ( left(N H_{4}right)_{2} C O_{3} ) |
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| 474 | The incorrect statement(s) is/are: A. ( M g ) cannot form complexes B. ( B e ) can form complexes due to a very small atomic ( operatorname{size} ) C. The first ionisation potential of ( B e ) is higher than that of ( M g ) D. ( M g ) forms an alkaline hydroxide while ( B e ) forms amphoteric oxides |
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| 475 | • 83 Tons of an element of aroup 1 participate in the transmission of nerve signals and transport of sugars and aminoacids into cells. This element imparts yellow colour to the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame? oli motol must be sodium It reacts |
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| 476 | Why whitewashing walls gives a shiny finish to the walls? A. Because of the formation of ( M g C O_{3} ) B. Because of the formation of ( C a C O_{3} ) c. Because of the formation of ( C a(O H) ) D. None of these |
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| 477 | In the preparation of sodium carbonate, which of the following is used as raw material? A. Slaked lime B. Quick lime c. lime stone D. Sodium hydroxide |
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| 478 | The standard solution of sodium hydroxide cannot be prepared by direct weighing of cold sodium hydroxide because it is : A . a solid B. a liquid c. deliquescent D. none of the above |
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| 479 | Complete the following equation: ( N a_{2} O_{2}+2 H_{2} O rightarrow(underline{W})+H_{2} O_{2} ) ( 2 K O_{2}+2 H_{2} O rightarrow(underline{X})+(underline{Y})+O_{2} ) ( N a_{2} O+C O_{2} rightarrow(Z) ) A. ( W-4 N a, X-K_{2} O, Y-H_{2} O, Z-N a_{2} O_{2} ) B. ( W-4 N a, X-K_{2} O, Y-H_{2} O_{2}, Z-N a_{2} C O_{3} ) c. ( W-4 ) NaOH ( , X-2 )КОН ( , Y-H_{2} ) О ( , Z- ) Na( _{a} ) О ( _{3} ). D. ( W-2 N a O H, X-2 K O H, Y-H_{2} O_{2}, Z-N a_{2} C O_{3} ) |
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| 480 | Out of the elements marked ( A, B, C, D, E ) ( mathrm{F}, mathrm{G} ) and ( mathrm{H} ) which form superoxides? This question has multiple correct options ( A cdot A ) B. B ( c . c ) ( D cdot D ) E. ( F . F ) ( G ) |
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| 481 | Which of the following is organometalic compound A. Methyl lithium B. Lithium methoxide c. Lithium dimethyl amide D. Lithium acetate |
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| 482 | Sodium sulphate is soluble in water, whereas barium sulphate is sparingly soluble because: This question has multiple correct options A. the hydration energy of sodium sulphate is more than its lattice energy B. the lattice energy of barium sulphate is more than its hydration energy C. the lattice energy has no role to play in solubility D. the hydration energy of sodium sulphate is less than its lattice energy |
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| 483 | A compound which can be used in space vehicles both to a absorb ( C O_{2} ) and liberate ( boldsymbol{O}_{2} ) is: A . ( N a O H ) в. ( N a_{2} O ) c. ( N a_{2} O_{2} ) ( mathbf{D} cdot C a O+N a O H ) |
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| 484 | State whether the following statement is true or false:
The salt which is used in medicine as a |
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| 485 | A mixture of sodium oxide and calcium oxide are dissolved in water and saturated with excess carbon dioxide gas. The resulting solution is and it contains ( mathbf{A} cdot operatorname{Basic} N a O H ) and ( C a(O H)_{2} ) B. Neutral ( N a_{2} C O_{3} ) and ( C a C O_{3} ) ( mathbf{c} . ) Ваsic ( N a_{2} C O_{3} ) and ( C a C O_{3} ) D. Acidic ( N a O H ) and ( C a C O_{3} ) |
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| 486 | Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability: ( B e S O_{4}, M g S O_{4}, C a S O_{4}, S r S O_{4} ) A ( cdot B e S O_{4}>M g S O_{4}>C a S O_{4}>S r S O_{4} ) в. ( operatorname{SrSO}_{4}>operatorname{Mg} S O_{4}>operatorname{CaSO}_{4}> )Ве( S O_{4} ) c. ( operatorname{SrSO}_{4}>operatorname{CaSO}_{4}>operatorname{MgSO}_{4}>operatorname{BeSO}_{4} ) ( mathrm{D} cdot operatorname{SrSO}_{4}>operatorname{CaSO}_{4}>operatorname{Be} mathrm{SO}_{4}>mathrm{MgSO}_{4} ) |
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| 487 | Which of the following reagent is used as fixer in photography? ( mathbf{A} cdot A g B r ) в. ( A g N O_{3} ) c. ( N a_{2} S_{2} O_{3} cdot 5 H_{2} O ) D. Both A and C |
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| 488 | Q24. Explain the significance of sodium, potassium, magnesium and calcium in biological fluids. Ana Sada |
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| 489 | 011. How would you prepare sodium silicate from silica? | 11 |
| 490 | The main constituents of cement are: A. calcium oxide, silicon dioxide, aluminium oxide B. calcium oxide, Iron oxide, sulphur dioxide C. magnesium oxide, silicon dioxide, aluminium oxide D. none of these |
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| 491 | A compound ( (X) ) gives brick red flame and breaks down on heating giving oxygen brown gas ( (A) ) and ( (B) ). Identify ( (X),(A) ) and ( (B) ) respectively A ( cdot C aleft(N O_{3}right)_{2}, N O_{2}, C a O ) в. ( C aleft(N O_{3}right)_{2}, C a O, N O_{2} ) c. ( M gleft(N O_{3}right)_{2}, M g O, N O_{2} ) D. ( M gleft(N O_{3}right)_{2}, N O_{2}, M g O ) |
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| 492 | Looking at the alkali metals, which one would have the strongest Coulombic forces leading to the highest melting point when paired with the corresponding Halogen in the same row? A . Lithium B. Sodium c. Potassium D. Rubidium |
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| 493 | Cement is a mixture of: A . calcium silicates B. calcium aluminates c. calcium silicates and aluminates D. none of these |
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| 494 | As per observation (iii) LiH is more stable than NaH, because: A. Due to small size of ( L i^{+} ), the lattice energy of LiH is greater B. Due to greater size of ( H^{-} ), the lattice energy of LiH is greater C. LiH is more covalent than NaH D. Due to greater size of ( N a^{+} ), the lattice energy of NaH is greater |
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| 495 | Sodium when burnt in excess of oxygen gives sodium oxide. If true enter 1 , else enter 0 |
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| 496 | Explain the following phenomenon by means of balanced equation: (a) When the solution (b) is heated, turbidity reappears. (b) The turbidity of solution (a) eventually disappears when continued exhaling is made through it (c) When the solution (b) is heated, turbidity reappears. |
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| 497 | Alkali metals dissolve in liquid ( N H_{3} ) then which of the following observation(s) is/are true? A . ( H_{2} ) gas is liberated B. Solution is blue due to the presence of solvated electrons c. solution is conducting D. All of the above |
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| 498 | Calcium chloride is used as a dehydration agent because: A. it has a strong affinity for water B. it has water of crystalline attached to it c. it loses water when exposed to air D. it has a high melting point. |
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| 499 | Which of the following statements is not correct regarding preparation of NaOH? A. NaOH is prepaid by electrolysis of sodium chloride in castner-Kellner cell. B. Sodium metal discharged at cathode combines with mercury to form sodium amalgam c. chlorine is evolved at anode D. Amalgam is heated to separate Na and Hg |
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| 500 | Which one of the following has magnesium? A. Vitamin ( B_{12} ) B. Chlorophyll c. Haemocyanin D. Carbonic anhydrase |
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| 501 | Why are potassium and caesium used, rather than lithium used in photoelectric cells? |
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| 502 | When magnesium burns in steam, the formulae of the products are: A ( cdot M g(O H)_{2}, H_{2} ) ( mathbf{B} cdot mathrm{MgO}, H_{2} ) с. ( M g O_{2}, H_{2} ) D. ( M g(O H)_{2}, O_{2} ) |
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| 503 | A one litre flask is full of reddish brown bromine fumes. The intensity of brown colour of vapour will decrease appreciably on adding to the flask ( x ) number of species from the following find ( x ) (i) Marble pieces (ii) Animal charcoal powder (iii) ( mathbf{C} boldsymbol{C l}_{mathbf{4}} ) (iv) ( mathbf{C} boldsymbol{S}_{2} ) (v) Water ( A cdot(3) ) B. (2) c. (1) ( D cdot(4) ) |
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| 504 | What is the product formed when hydrated ( C a S O_{4} ) is heated to ( 125^{circ} C ) instead of ( 200^{circ} mathrm{C} ? ) ( mathbf{A} cdotleft(C a S O_{4}right) frac{1}{2} H_{2} O ) в. ( operatorname{CaSO}_{4} frac{3}{4} mathrm{H}_{2} mathrm{O} ) ( mathrm{c} cdot mathrm{CaSO}_{4} ) D. ( C a O+S O_{3} ) |
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| 505 | Consider the following statement: Both ( L i ) and ( M g ) forms hydrated chloride. If true enter ( 1, ) else enter 0 |
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| 506 | Due to diagonal relationship between Be and ( A l ) : A. both are metals B. both are metalloids c. both form polymeric covalent hydrides D. none of these |
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| 507 | . 10 Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide? (a) Be(OH)2 (b) Mg(OH)2 (c) Ca(OH)2 (d) Ba(OH), |
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| 508 | The alkali metals: This question has multiple correct options A. form salts like hydrides B. posses low ionisation potential C. have a high affinity towards non-metals. D. have low density |
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| 509 | Q. 36 All compounds of alkali metals are easily soluble in water but lithium compounds are more soluble in organic solvents. Explain. Ane Smatleet pizofli 11 |
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| 510 | Which of the following represents calcium chlorate? A ( cdot C a C l O_{2} ) в. ( operatorname{Ca}left(C l O_{4}right)_{2} ) c. ( C aleft(C l O_{3}right)_{2} ) D. ( C aleft(C l O_{2}right)_{2} ) |
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| 511 | The alkaline earth metal that has greatest affinity for nitrogen is A. sr в. мв ( c cdot c a ) D. Ba |
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| 512 | Calcium carbonate reacts with aqueous ( H C I ) to give ( C a C l_{2} ) and ( C O_{2} ) according to the reactions: ( boldsymbol{C a C O}_{3(s)}+mathbf{2 H C l}_{(a q)} rightarrow boldsymbol{C a C l}_{2(a q)}+ ) ( boldsymbol{C O}_{2(g)}+boldsymbol{H}_{2} ) OWhat mass of ( boldsymbol{C a C O}_{3} ) is required to completely react with ( 25 m L ) of ( 0.75 M H C l ? ) A ( .0 .253 mathrm{g} ) B. ( 0.425 mathrm{g} ) c. ( 0.9375 mathrm{g} ) D. None of these |
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| 513 | Calamine is used to reduce the irritating effect of ant bite/sting because it reacts with (X) released due to the bit /sting of ants with (Y) present in calamine. ( (mathrm{X}) ) and ( (mathrm{Y}) ) respectively are: A. sodium hydrogen carbonate and formic acid B. formic acid and zinc carbonate c. acetic acid and common salt D. hydrochloric acid and zinc oxide |
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| 514 | What is the correct order of thermal stability of carbonates of alkaline earth metals? A ( cdot B e C O_{3}>M g C O_{3}>C a C O_{3}>S r C O_{3}>B a C O_{3} ) в. ( B e C O_{3}<M g C O_{3}<C a C O_{3}<S r C O_{3}<B a C O_{3} ) c. ( B e C O_{3}C a C O_{3}>S r C O_{3}M g C O_{3}<C a C O_{3}<S r C O_{3}<B a C O_{3} ) |
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| 515 | ( boldsymbol{Y} stackrel{boldsymbol{Delta}, 205^{circ} boldsymbol{C}}{boldsymbol{C}} boldsymbol{C a S} boldsymbol{O}_{4} cdot boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O} stackrel{boldsymbol{Delta}, mathbf{1 2 0}^{circ} boldsymbol{C}}{longrightarrow} boldsymbol{X} ) ( X ) and ( Y ) are respectively A. plaster of paris, dead burnt plaster B. dead burnt plaster, plaster of paris c. ( C a O ), plaster of paris D. plaster of paris, mixture of gases |
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| 516 | “Polarising power of ( L i^{+} ) ion is nearly the same as that of ( M g^{2+} ) ion.” Answer whether the above statement is |
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| 517 | The substance not likely to contain ( boldsymbol{C a C O}_{3} ) is: A. dolamite B. sea shell c. calcined gypsum D. marble statue |
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| 518 | Q1. Why are alkali metals soft and have low melting points? .1 1 * Low we were vuolewa * 1 |
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| 519 | Why are group I elements: (a) univalent (b) largely ionic (c) strong reducing agents (d) poor complexing agents? (e) why do they have the lowest first ionization energy values in their periods? |
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| 520 | n the given Haber process, find out ( A ) A. сао в. ( C a(O H)_{2} ) ( c cdot C a C O_{3} ) D. None of these |
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| 521 | Which of the following statement(s) is/are incorrect? This question has multiple correct options A. Magnesium may be extracted by self reduction method. B. Down’s process is used to extract magnesium from sea water. C. Magnalium is an alloy of magnesium D. Formula of epsom salt is ( M g S O_{4} .6 H_{2} O ) |
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| 522 | R. 22 Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties? (a) High boiling point (b) High negative standard electrode potential (c) High density (d) Large atomic size |
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| 523 | Give four uses of sodium carbonate (washing soda) |
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| 524 | 21. Crude common salt is hygroscopic because of the presence of impurities of (a) CaSO4 and MgSO4 (b) CaCl, and MgCl2 (c) CaBr, and MgBr, * (d) Ca(HCO3)2 and Mg(HCO3)2 |
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| 525 | Na Cl is dissolved in water. Which of the following statement is correct? A. ( N a^{+} ) is oxidised B. ( N a^{+} ) is reduced C. ( N a^{+} ) is hydrolysed D. ( N a^{+} ) is hydrated |
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| 526 | The balanced equations for : “Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia” A ( cdot ) NaCl ( +N H_{4} O H+C O_{2} rightarrow N H_{4} C l+N a H C O_{3} ) B . ( 2 mathrm{NaCl}+mathrm{NH}_{4} mathrm{OH}+mathrm{CO}_{2} rightarrow mathrm{NH}_{4} mathrm{Cl}+2 mathrm{NaH} mathrm{CO}_{3} ) c. ( N a C l+N H_{4} O H+C O_{2} rightarrow N H_{4} C O+N a H C l_{3} ) D. ( N a C l+N H_{4} O H+C O_{2} rightarrow N H_{3}+N a C l+H_{2} C O_{3} ) |
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| 527 | Select the incorrect statement(s): This question has multiple correct options A. Magnesium can be burnt in the atmosphere of ( C O_{2} ) and ( S O_{2} ) B. Magnesium reacts with alkyl halides to form Grignard’s reagent C. Out of ( M g ) and ( C a ), only ( M g ) reacts with ( N_{2} ) to form magnesium nitride D. Calcium is less reactive than magnesium |
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| 528 | Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)? |
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| 529 | Statement : If equal masses of sodium metal and chlorine gas are allowed to react, some sodium will be leftover after all the chlorine is used up. Statement 2: The reaction required twice as many atoms of chlorine as Sodium. A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1 B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1. c. Statement 1 is correct but Statement 2 is not correct. D. Statement 1 is not correct but Statement 2 is correct. E. Both the Statement 1 and Statement 2 are not correct. |
11 |
| 530 | Q32. Which one of the following alkaline earth metal carbonates is thermally most stable? (a) MgCo() Caco, (c) Srco; (d) BaCO3 |
11 |
| 531 | Plaster of paris is obtained by heating gypsum at controlled-temperature. A. True B. False |
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| 532 | Write the chemical formula of baking soda. |
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| 533 | The metallic luster exhibited by sodium is explained by : A. diffusion of sodium ions B. oscillations of loose electrons c. excitation of free protons D. existence of body centered cubic lattice |
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| 534 | The decreasing order of the second ionization potential of ( M g, C a ) and ( B a ) is: A. ( M g>C a>B a ) в. ( C a>B a>M g ) с. ( B a>M g>C a ) D. ( M g>B a>C a ) |
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| 535 | Assertion The mobility of sodium ion is lower than that of potassium ion. Reason The ionic mobilities depend on the effective radius of the ion. 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. Assertion is incorrect but Reason is correct |
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| 536 | mole of a substance (X) was treated with an excess of water. 2 moles of readily combustible gas were produced along with solution which when reacted with ( C O_{2} ) gas produced a white turbidity. The substance (X) could be: A. ( C a ) в. ( C a H_{2} ) ( mathbf{c} cdot operatorname{Ca}(O H)_{2} ) ( mathrm{D} cdot mathrm{Ca}left(mathrm{NO}_{3}right)_{2} ) |
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| 537 | A metal ( M ) readily forms water-soluble sulphate ( M S O_{4}, ) water-insoluble hydroxide ( M(O H)_{2} ) and oxide ( M O . ) The oxide and hydroxide are soluble in NaOH. The ( M ) is: ( A . B e ) в. ( M g ) ( c . C a ) D. ( S r ) |
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| 538 | Assertion Ether can extract LiCl from the aqueous solution of a mixture of LiCl, NaCl and KCI. Reason Hydration of ( L i^{+} ) ion is greater than that of ( N a^{+} ) and ( K^{+} ) ions. 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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| 539 | Which one is not the property of Lithium by which it differs from the rest of the alkali metals? A. Extremely small size of Lithium atom B. Greater polarizing power of Lithium ion c. Highest electropositive character and highest ionization energy D. Non availability of vacant d-orbitals in the valence shell |
11 |
| 540 | The ATP forms a complex with: A. ( M g^{2+} ) в. ( C a^{2} ) ( mathbf{c} cdot B e^{2+} ) D. ( B a^{2} ) |
11 |
| 541 | ( N a H C O_{3} ) represent the formula of which one of the following? A. Sodium carbonate B. Baking soda c. Sodium acetate D. washing soda |
11 |
| 542 | State whether the given statement is true or false: The above reaction proceeds better with NaF than with KF. [ >c-c l+M F longrightarrow->c-F+M C l ] |
11 |
| 543 | Beryllium and aluminium exhibit many properties which are similar but the two elements differ in A. forming covalent halides B. forming polymeric halides c. exhibiting maximum covalency in compounds D. exhibiting amphoteric nature in their oxides |
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| 544 | The element that does NOT form acidic oxide is : A. carbon B. phosphorus c. chlorine D. barium |
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| 545 | State whether the given statement is true or false: ( K O_{2}, B a O_{2}, N a_{2} O_{2} ) are superoxides. A. True B. False |
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| 546 | Anhydrone is a common name given to: ( mathbf{A} cdot M gleft(O H_{2}right) cdot 6 H_{2} O ) B. ( M g S O_{4} .7 H_{2} O ) ( mathrm{c} cdot M g(O H) cdot 7 mathrm{H}_{2} mathrm{O} ) D ( cdot_{M g}left(C l O_{4}right)_{2} ) |
11 |
| 547 | Assertion Among the second group peroxides, barium peroxide is thermally most stable. Reason Positive charge density is maximum for ( B a^{2+} ) among group II cations A. The Assertion is True, Reason is True; Reason is a correct explanation for Assertion B. The Assertion is True, Reason is True; Reason is not a correct explanation for Assertion C. Assertion is True, Reason is False D. Assertion is False, Reason is True. |
11 |
| 548 | State True or False. Caphosol a supersaturated calcium phosphate solution is used in the prevention and treatment of oral mucositis caused by chemotherapy or radiotherapy. A. True B. False |
11 |
| 549 | Consider the following reactions: ( boldsymbol{C a C O}_{3} rightarrow boldsymbol{C a O}+boldsymbol{C O}_{2} ) ( boldsymbol{E}+boldsymbol{C O}_{2} rightarrow boldsymbol{F} ) ( N a C l+F rightarrow A+N a H C O_{3} ) where ( boldsymbol{E} ) and ( boldsymbol{F} ) are respectively: A. ( N H_{4} H C O_{3} ) and ( N H_{4} C l ) B. ( N a O H ) and ( N a H C O_{3} ) c. ( c a(O H)_{2} ) and ( C aleft(H C O_{3}right)_{2} ) D. none of the above |
11 |
| 550 | Which impurity (as a salt) is associated with table salt obtained from sea-water? A. ( N a H C O_{3} ) B. ( M g C O_{3} ) c. ( M g C l_{2} ) D. NaI |
11 |
| 551 | Write uses of baking powder ( left(N a H C O_{3}right) ) |
11 |
| 552 | Choose the correct answer form the alternatives given. Which of the following compounds are not arranged in correct order as indicated? A ( cdot operatorname{Sr} C l_{2}<C a C l_{2}<M g C l_{2}<B e C l_{2} ) (increasing extent of hydrolysis) B. ( S r C l_{2}<C a C l_{2}<M g C l_{2}<B e C l_{2} ) (increasing lattice energy） ( mathrm{c} cdot mathrm{CaSO}_{4}<mathrm{MgSO}_{4}<mathrm{BeSO}_{4} ) (increasing stability) D. ( B e(O H)_{2}<M g(O H)_{2}<C a(O H)_{2} ) (increasing solubility) |
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| 553 | The chemical name of baking soda is: A. sodium hydrogen carbonate B. sodium carbonate c. sodium bisulphite D. none of the above |
11 |
| 554 | The least electro positive alkali metal is: A. Sodium B. Lithium c. Potassium D. Caesium |
11 |
| 555 | Setting of cement is: A. exothermic reaction B. endothermic reaction C. neither endothermic nor exothermic D. None of the above |
11 |
| 556 | Describe in details the industrial electrolysis of sodium chloride. Comment on the purity of the products. |
11 |
| 557 | Which of the following halides of calcium is insoluble in water? A. ( C a C l_{2} ) в. ( C a I_{2} ) c. ( C a F_{2} ) D. ( C a B r_{2} ) |
11 |
| 558 | “BeO has hexagonal ZnS structure.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
11 |
| 559 | Which one of the following pairs do not impart colour to the flame? A. ( B e C l_{2} ) and ( S r C l_{2} ) в. ( B e C l_{2} ) and ( M g C l_{2} ) c. ( C a C l_{2} ) and ( B a C l_{2} ) D. ( B a C l_{2} ) and ( S r C l_{2} ) |
11 |
| 560 | Which of the following is not a use of baking soda? A. In medicines as antacid B. As a component of baking powder c. In removing permanent hardness of water D. In fire extinguishers |
11 |
| 561 | ( N a O H ) form hydrated salts. A. True B. False |
11 |
| 562 | ( boldsymbol{C a}left(boldsymbol{H}_{2} boldsymbol{P} boldsymbol{O}_{4}right)_{2} ) in baking powder: A. Behaves as an acid in moist condition and decomposes ( N a H C O_{3} ) to give ( C O_{2} ) B. Behave as a base in moist condition and gives ( H_{3} P O_{4} ) c. Behaves as binder D. Behaves as a filler |
11 |
| 563 | Give reasons: When the gas formed on heating limstone is passed through freshly prepared lime water, the lime water turns milky. |
11 |
| 564 | ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) is treated with marble, it releases which A ( cdot C O_{2}, ) turns lime water milky B. ( H_{2} ), burns with a pop sound c. ( O_{2} ), rekindles a burning spirit D. none of the above |
11 |
| 565 | In ( K O_{2}, ) the nature of oxygen species and the oxidation state of oxygen atom are, respectively. A. Superoxide and -1 B. superoxide and – ( frac{1}{2} ) c. peroxide and ( -frac{1}{2} ) D. Oxide and -2 |
11 |
| 566 | Match compounds given in (X) with their uses in ( (Y): ) ( X ) A. ( mathrm{Na}_{2} mathrm{CO}_{3} ) I glass B. ( mathrm{Na}_{2} mathrm{SO}_{3} ) II bleach C. ( mathrm{NaOH} ) III ( mathrm{SO}_{2} ) absorber D. NaOCI IV detergent A . A-IV, B-I, C-III, D-II B. A-I, B-III, C-IV, D-1 || c. A-II, B-IV, C-I, D-III D. A-III, B-II, C-IV, D-1 |
11 |
| 567 | Which of the following objects are soluble in water? A. Fodder B. Table salt c. chalk powder D. clay |
11 |
| 568 | Q. 39 Why do beryllium and magnesium not impart colour to the flame in the flame test? |
11 |
| 569 | Largest difference in radii is found in which of the following pair? A. ( L i, N a ) в. ( N a, K ) c. ( K, R b ) D. ( R b, C s ) |
11 |
| 570 | State the chemical property in each case on which the following uses of baking soda are based (i) As an antacid (ii) As a constituent of baking powder Give the chemical for baking soda |
11 |
| 571 | A solution of a substance ‘X’ is used for white washing. Write the reaction of the substance ‘X’ |
11 |
| 572 | A solution of caustic soda (NoOH) in water or when fused,conducts electric current. What is the similarity in these two cases? |
11 |
| 573 | The metal which can displace hydrogen from acid is: A . silver B. calcium c. mercury D. gold |
11 |
| 574 | A mixture of ( L i_{2} C O_{3} ) and ( K_{2} C O_{3} ) on strong heating gave 0.25 mole of ( C O_{2} ) The mole ( % ) of ( L i_{2} C O_{3} ) and ( C O_{2} ) in the mixture is : ( begin{array}{lll}text { A } cdot L i_{2} C O_{3}: 25 % & K_{2} C O_{3}: 75 %end{array} ) B . ( L i_{2} C O_{3}: 75 % quad K_{2} C O_{3}: 25 % ) ( mathrm{c} cdot L i_{2} C O_{3}: 60 % quad K_{2} C O_{3}: 40 % ) D. ( L i_{2} C O_{3}: 40 % quad K_{2} C O_{3}: 60 % ) |
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| 575 | UULIL PIULUIELLIC LES ICICI LITLUL IILUUIII. Q10. When alkali metal dissolves in liquid ammonia, the solution can acquire different colours. Explain the reason for this type of colour change. |
11 |
| 576 | Which of the following metals can form nitride with nitrogen? A ( . L i ) в. ( N a ) ( mathrm{c} cdot M g ) D. ( C a ) |
11 |
| 577 | State True or False. ( B e H_{2} ) is an ionic hydride. A. True B. False |
11 |
| 578 | In what ways lithium shows similarities to magnesium in its chemical behaviour? | 11 |
| 579 | . 2 Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously? (a) Li (b) Na (c) K (d) Cs |
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| 580 | Sodium carbonate is used to: A. preserve pickles, fish B. baking industry c. manufacture borax D. all of above |
11 |
| 581 | Why is tartaric acid added into baking soda to get baking powder? | 11 |
| 582 | Lithopone is mixture of : A. ( Z n C O_{3}, B a C O_{3} ) в. ( Z n S, N a_{2} S O_{4} ) ( mathrm{c} cdot Z n S O_{4}, B a S O_{4} ) D. ( Z n S, ) BaSO( _{4} ) |
11 |
| 583 | Compare and contrast the chemistry of group 1 metals with that of group 2 metals with respect to oxides. | 11 |
| 584 | Which of the following will have the largest size in water? ( mathbf{A} cdot R b^{-} ) В. ( N a^{+} ) ( c cdot K^{+} ) D. ( L i^{+} ) |
11 |
| 585 | Highly pure dilute solution of sodium in liquid ammonia: This question has multiple correct options A. shows blue color B. exhibits electric conductivity c. produces sodium amide D. produces hydrogen gas |
11 |
| 586 | Halides of alkaline earth metals from hydrates such as, ( M g C l_{2} cdot 6 H_{2} O, C a C l_{2} ) ( 6 H_{2} O, B a C l_{2} cdot 2 H_{2} O, ) and ( S r C l_{2} ) ( 2 H_{2} O ) This shows that halides of group II elements: A. are hygroscopic in nature B. act as dehydrating agents. c. can absorbs moisture from air D. cannot absorbs moisture from air |
11 |
| 587 | Why lime has been used in mortar (a lime, sand and water paste) in building houses, etc. for several thousand years? |
11 |
| 588 | The set representing the correct order of the first ionization potential is: A. ( K>N a>L i ) в. ( B e>M g>C a ) c. ( B>C>N ) D. ( G e>S i>C ) |
11 |
| 589 | Which of the following changes occurs when excess of ( C O_{2} ) gas is passed into a clear solution of lime water? A . A white precipitate containing both ( C a C O_{3} ) and ( C aleft(H C O_{3}right)_{2} ) is formed B . Initially a white precipitate of ( C a C O_{3} ) is formed which changes into soluble ( C aleft(H C O_{3}right)_{2} ) on passing excess ( C O_{2} ) gas C. A white precipitate of ( C aleft(H C O_{3}right)_{2} ) is formed D. A white precipitate of ( C a C O_{3} ) is formed |
11 |
| 590 | Common name of sodium chloride is salt. |
11 |
| 591 | Which one of the following statement(s) is/are true about ( operatorname{Ca}(boldsymbol{O H})_{2} ) ? This question has multiple correct options A. It is used in the preparation of bleaching powder B. It is a light blue solid c. It is used in chromatography D. Its solution in water is called lime water |
11 |
| 592 | ( H C l ) is dried by passing through ( C a O ) A. True B. False |
11 |
| 593 | 22 Q26. Comment on each of the following observations: (a) The mobilities of the alkali metal ions in aqueous solution are Lit < Nat <kt < Rb+ < Cst (b) Lithium is the only alkali metal to form a nitride directly. (c) E for M2+ (aq) + 2e → M(s) (where M = Ca, Sr, or Ba) is nearly constant. |
11 |
| 594 | Nuclear attraction is often the deciding control factor for the association of natural molecules to a given metal ion. Which one of the following represents the correct order of stability of the ions? ( left[boldsymbol{B e}left(boldsymbol{H}_{2} boldsymbol{O}right)_{4}right]^{2+},left[boldsymbol{M} boldsymbol{g}left(boldsymbol{H}_{2} boldsymbol{O}right)_{4}right]^{2+}, boldsymbol{C} boldsymbol{a}left(boldsymbol{H}_{2} boldsymbol{C}right. ) ( left.left.mathbf{A} cdotleft[B eleft(H_{2} Oright)_{4}right]^{2+}>S rleft(H_{2} Oright)_{4}right]^{2+}right]>left[M gleft(H_{2} Oright)_{4}right]^{2+}> ) ( left[C aleft(H_{2} Oright)^{4}right]^{2+} ) B . ( left[C aleft(H_{2} Oright)_{4}right]^{2+}>left[M gleft(H_{2} Oright)_{4}right]^{2+}>left[B eleft(H_{2} Oright)_{4}right]^{2+}> ) ( left.operatorname{Sr}left(H_{2} Oright)_{4}right]^{2+} ) C ( cdotleft[operatorname{Sr}left(H_{2} Oright)_{4}right]^{2+}>left[C aleft(H_{2} Oright)_{4}right]^{2+}>left[M gleft(H_{2} Oright)_{4}right]^{2+}> ) ( left[operatorname{Be}left(H_{2} Oright)_{4}right]^{2+} ) D. ( left[B eleft(H_{2} Oright)_{4}right]^{2+}>left[M gleft(H_{2} Oright)_{4}right]^{2}>left[C aleft(H_{2} Oright)_{4}right]^{2+}> ) ( left.operatorname{Sr}left(H_{2} Oright)_{4}right]^{2+} ) |
11 |
| 595 | Which oxide is formed when potassium is heated in excess of oxygen? ( A cdot K_{2} O ) B. KO ( mathrm{c} cdot mathrm{K}_{2} mathrm{O}_{2} ) D. ( K O_{2} ) |
11 |
| 596 | Which of the following has maximum ionization energy? A ( cdot B a rightarrow B a^{+}+e^{-} ) B. ( B e rightarrow B e^{+}+e^{-} ) c. ( C a rightarrow C a^{2+}+2 e^{-} ) D. ( M g rightarrow M g^{2+}+2 e^{-} ) |
11 |
| 597 | The characteristic not related to alkali metals is : A. their ions are isoelectronic with noble gases. B. metallic character c. low electronegativity. D. high ionization energy. |
11 |
| 598 | Q30. Which of the alkali metal is having least melting point? (a) Na (6) K (c) Rb (d) Cs |
11 |
| 599 | Q1. What are the common physical and chemical features of alkali metals? | 11 |
| 600 | Q. 49 The stability of peroxide and superoxide of alkali metals increase as we go down to group. Explain giving reason. Thootability of |
11 |
| 601 | Gypsum is added to Portland cement to: A. fasten the process of setting B. slow down the process of setting C. improve the colour of the cement D. increase the melting point of cement |
11 |
| 602 | Anhydrous ( M g C l_{2} ) can be prepared by heating ( M g C l_{2} cdot 6 H_{2} O: ) A. In a current of dry HCl gas B. With carbon c. Until it fuses D. With lime |
11 |
| 603 | Find correct order of polarising power between ( A l^{+2} ) and ( B e^{+2} ) (both shows digonal relationship): A ( cdot B e^{+2}>A l^{+2} ) B. ( B e^{+2}>A l^{+2} ) D. ( B e^{+2}=A l^{+2} ) |
11 |
| 604 | A compound ( X ) on heating gives a colourless gas. The residue is dissolved in water to obtain ( Y . ) Excess ( C O_{2} ) is passed through aqueous solution of ( boldsymbol{Y} ) when ( Z ) is formed. ( Z ) on gentle heating gives back ( X . ) The compound ( X ) is: A ( cdot operatorname{Ca}left(mathrm{HCO}_{3}right)_{2} ) в. ( C a C O_{3} ) с. ( _{text {NaH } mathrm{CO}_{3}} ) D. ( N a_{2} C O_{3} ) |
11 |
| 605 | Caustic soda is chemically sodium hydroxide ( (N a O H) ) A. True B. False |
11 |
| 606 | What is requirement for sodium in milligrams per day? A . 400 B. 500 ( c cdot 600 ) D. 700 |
11 |
| 607 | Q. 45 Assertion (A) Beryllium carbonate is kept in the atmosphere of carbon dioxide. Reason (R) Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide. (a) Both A and R are correct and R is the correct explanation of A (b) Both A and R are correct but R is not the correct explanation of A (c) Both A and Rare not correct (d) A is not correct but R is correct nnn duinto omall size and high polarising power of Be+ |
11 |
| 608 | As the alkaline earth metals (except Be) tend to lose their valence electrons readily they act as: A. weak oxidising agent B. weak reducing agent C. strong oxidising agent D. strong reducing agent |
11 |
| 609 | Which of the following are exothermic processes? (i) The reaction of water with quicklime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals) ( A cdot ) (i) and (ii) B. (ii) and (iii) c. (i) and (iv) D. (iii) and (iv) |
11 |
| 610 | The correct increasing order of melting point of alkali metal carbonates is: A ( cdot C s_{2} C O_{3}<N a_{2} C O_{3}<K_{2} C O_{3}<R b_{2} C O_{3}< ) ( L i_{2} C O_{3} ) в. ( L i_{2} C O_{3}<N a_{2} C O_{3}<K_{2} C O_{3}<R b_{2} C O_{3}< ) ( C s_{2} C O_{3} ) 3 c. ( L i_{2} C O_{3}<R b_{2} C O_{3}<K_{2} C O_{3}<N a_{2} C O_{3}< ) ( C s_{2} C O_{3} ) D. None of these |
11 |
| 611 | Reaction of ( boldsymbol{O}_{2} ) is faster with ( boldsymbol{C} boldsymbol{a} ) or ( boldsymbol{M} boldsymbol{g} ) ? ( mathbf{A} cdot M g ) в. ( C a ) c. Equally react D. Do not react |
11 |
| 612 | (B) and (C) are: A ( cdot C a O, C a(O H)_{2} ) в. ( C a(O H)_{2}, C a C O_{3} ) c. ( operatorname{CaCO}_{3}, operatorname{Ca}(O H)_{2} ) D. ( C a(O H)_{2}, C a O ) |
11 |
| 613 | Write the balanced chemical equations for the following reactions and identify the type of reaction: limestone is heated strongly to form quicklime and carbon dioxide gas is evolved |
11 |
| 614 | Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? A ( cdot operatorname{CaSO}_{4} ) в. ( B e S O_{4} ) c. ( B a S O_{4} ) D. ( operatorname{sr} operatorname{sO} 4 ) |
11 |
| 615 | Assertion ( N a C l ) is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. Reason In solid ( N a C l, ) the ions have fixed positions in the lattice structure and there are no free ions but in aqueous solution or molten state, the ions can move freely and thus conduct electricity. 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 |
| 616 | One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is: A . acetic acid B. oxalic acid c. carbonic acid D. tartaric acid |
11 |
| 617 | State True or False. Tricalcium phosphate is used as a nutritional supplement and occurs naturally in cow milk. A. True B. False |
11 |
| 618 | Alkaline earth metals are : A. reducing agent B. dehydrating agent c. amphoteric D. oxidising agent |
11 |
| 619 | In manufacture of sodium carbonate from Solvay (or ammonia soda) process the raw material used is : A . NaOH в. ( N a_{2} S O_{4} ) c. Naci D. ( operatorname{NaH} mathrm{CO}_{3} ) |
11 |
| 620 | The single-bonded metallic radius of sodium is 157 pm. Assume that the increment between radii of different magnitudes is 60 pm. The ionic radius ( N a^{+} ) in ( mathrm{pm} ) is ( (90+x) . ) Find ( x ) |
11 |
| 621 | The correct increasing order of basic nature among Be, Mg, Ca and Sr is : A. ( B e<C a<M g<S r ) в. ( B e<M g<S r<C a ) c. ( B e<M g<C a<S r ) ( mathrm{D} cdot mathrm{Ca}<mathrm{Sr}<mathrm{Be}<mathrm{Mg} ) |
11 |
| 622 | The violet flame shown by potassium in Bunsen flame is due to jumping of the electron from : ( A cdot 1 s operatorname{to} 4 p ) B. 1s to 5p ( c cdot 4 p operatorname{tos} 4 s ) D. ( 5 p ) to 4 s |
11 |
| 623 | 7. Alkaline earth metals are (a) more reactive (c) more oxidizing (b) less reducing (d) less basic than alkali metals |
11 |
| 624 | ( boldsymbol{E}^{circ} ) for ( boldsymbol{M}^{2+}(boldsymbol{a} boldsymbol{q})+boldsymbol{2} boldsymbol{e}^{-} rightarrow boldsymbol{M}(boldsymbol{s}) ) (where ( M=C a, S r text { or } B a) ) is nearly constant. |
11 |
| 625 | Q7. In what ways lithium shows similarities to magnesium in its chemical behaviour? Ane G Both bit teformitidos |
11 |
| 626 | Assertion The metals of group 2 (except Be) form ionic compounds. Reason Electropositive character and the reducing property increase on moving down the group. Read the above assertion and reason and |
11 |
| 627 | What is the correct formula for calcium chloride? A. ( C a_{2} C l_{2} ) B. ( C a C l ) c. ( operatorname{caCl}_{2} ) D. ( C a C l_{3} ) E ( . C a_{2} C l ) |
11 |
| 628 | In electrolysis of sodium hydroxide solution: A. hydrogen is discharged at cathode. B. hydrogen is discharged at anode c. sodium is liberated at anode D. no hydrogen is liberated |
11 |
| 629 | Select the correct statement regarding hydrides of ( L i ) and ( B e ) ( mathbf{A} cdot operatorname{Both} L i H ) and ( B e H_{2} ) are ionic. B. ( L i H ) is ionic while ( B e H_{2} ) is covalent. C . Both ( L i H ) and ( B e H_{2} ) are covalent. D. ( L i H ) is covalent while ( B e H_{2} ) is ionic. |
11 |
| 630 | Sulphate of an alkaline earth metal which crystalizes without water of hydration is? ( A cdot B e^{2} ) в. ( M g^{2+} ) c. ( C a^{2+} ) ( D cdot S r^{2} ) |
11 |
| 631 | Which metal plays an important role in neuromuscular functions, interneuronal transmissions, cell membrane integrity and blood coagulation? ( A cdot B e ) в. Мв ( c cdot c a ) D. Ba |
11 |
| 632 | Which of the following does not illustrate the anomalous properties of Li? A. The m.p. and b.p. of ( L i ) are comparatively high B. ( L i ) is much softer than the other I group metals C . ( L i ) forms a nitride ( L i_{3} N ) unlike group I metals D. The ion of ( L i ) and its compounds are more heavily hydrated than those of the rest of the group |
11 |
| 633 | If ( Q ) (alkali metal) reacts with fluorine and oxygen, the molecular formula of fluoride and oxide respectively are: A. ( Q F_{3}, Q_{2} O_{3} ) в. ( Q F, Q_{2} O ) ( mathbf{c} cdot Q F_{2}, Q O ) D. None of these |
11 |
| 634 | Gypsum is added to clinker during cement manufacturing to: A. Decrease the rate of setting of cement B. Bind the particles of calcium silicate C. Facilitate the formation of colloidal gel D. All of the above |
11 |
| 635 | Match the following items in column I with the corresponding items in column ( | ) Column I Portland (i) ( N a_{2} C O_{3} cdot 10 H_{2} O ) (A) ( quad ) cement ingredient castner (ii) [ M gleft(H C O_{3}right)_{2} ] (B) ( quad ) Keller process (iii) ( quad N a O H ) Solvay (C) process Temporary ( begin{array}{llll}text { (iv) } & mathrm{Ca}_{3} mathrm{Al}_{2} mathrm{O}_{6} & text { (D) } & text { hardness }end{array} ) A ( cdot(i) rightarrow(C) ;(i i) rightarrow(B) ;(i i i) rightarrow(D) ;(i v) rightarrow(A) ) B . ( (i) rightarrow(C) ;(i i) rightarrow(D) ;(i i i) rightarrow(B) ;(i v) rightarrow(A) ) c. ( (i) rightarrow(D) ;(i i) rightarrow(A) ;(i i i) rightarrow(B) ;(i v) rightarrow(C) ) D. ( (i) rightarrow(B) ;(i i) rightarrow(C) ;(i i i) rightarrow(A) ;(i v) rightarrow(D) ) |
11 |
| 636 | Correct order of stability of group IIA metal carbonates is : ( mathbf{A} cdot M g C O_{3}>C a C O_{3}>S r C O_{3}>B a C O_{3} ) B. ( B a C O_{3}>S r C O_{3}>C a C O_{3}>M g C O_{3} ) ( mathbf{c} cdot operatorname{Sr} C O_{3}>B a C O_{3}>C a C O_{3}>M g C O_{3} ) ( mathrm{D} cdot mathrm{CaCO}_{3}>mathrm{MgCO}_{3}>mathrm{BaCO}_{3}>mathrm{SrCO}_{3} ) |
11 |
| 637 | If ( C a O ) caustic soda then which of the following option is correct? A ( cdot M gleft(C r O_{4}right)_{2}: ) Refractory metal B. ( C a H_{2} ) :Radioactive element c. Radium: Do not impart any colour D. ( M g O: ) constituent of sorel cement |
11 |
| 638 | Which of the following cannot react with NaOH? ( A . B e ) в. ( F e ) c. ( A l ) D. Zn |
11 |
| 639 | Metallic sodium is used as a drying agent for: This question has multiple correct options A. chloroform B. cyclohexane c. diispropyl ether D. diethylamine |
11 |
| 640 | Chlorophyll, the green component of plants contains: A ( cdot C a^{2} ) B. ( B e^{2} ) c. ( M g^{2+} ) D. ( B a^{2} ) |
11 |
| 641 | Q28. Write balanced equations for reactions between. (a) Na, o, and water (b) KO, and water (c) Na, and CO, |
11 |
| 642 | Discuss the various reactions that occur in the Solvay process. |
11 |
| 643 | Setting of plaster of paris involves: A. oxidation with atmospheric oxygen B. combination with atmospheric ( C O_{2} ) c. dehydration D. hydration to yield another hydrate |
11 |
| 644 | Chemical formula of washing soda is: A. ( N a_{2} C O_{3} ) в. ( N a_{2} C O_{3} .10 H_{2} O ) c. ( N a_{2} C O_{3} .5 H_{2} O ) D. ( N a_{2} S O_{4} .10 H_{2} O ) |
11 |
| 645 | Q19. Draw the structure of (i) BeCl, (vapour), (ii) BeCl, (solid). | 11 |
| 646 | In the presence of cobalt chloride ( left(mathrm{CoCl}_{2}right), ) bleaching powder decomposes to form: ( A cdot C a C O_{3} ) в. ( C a O C l ) ( mathrm{c} cdot mathrm{Cl}_{2} mathrm{O}_{8} ) D. ( mathrm{CaCl}_{2} ) |
11 |
| 647 | The polarising power of ( M g^{2+} ) is nearly same as that of: A ( cdot L i ) в. ( B a^{2} ) ( mathrm{c} cdot A l^{3} ) D. all of the above |
11 |
| 648 | “Na and Mg are also called bridge element since it links Group IA and Group IB”. State whether the above statement is |
11 |
| 649 | Identify ( (A) ) and ( (B) ) in the following sequence of reactions. ( boldsymbol{S} boldsymbol{n} boldsymbol{C l}_{2}+boldsymbol{2} boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H} rightarrow ) ( (boldsymbol{A})(boldsymbol{w} boldsymbol{h} i boldsymbol{t} e boldsymbol{p} boldsymbol{p} boldsymbol{t}) frac{N a O boldsymbol{H}}{(e x c e s s)}(boldsymbol{B}) ) A ( cdot operatorname{Sn}(O H)_{2}, N a_{2} operatorname{Sn} O_{3} ) B. ( operatorname{Sn}(O H)_{2}, N a_{2} S n O_{2} ) c. ( operatorname{Sn}(O H)_{2}, N a_{2} operatorname{Sn}(O H)_{6} ) D. ( operatorname{Sn}(O H)_{2} ), no effect |
11 |
| 650 | 010. Give the chemical formula of Epsom salt. | 11 |
| 651 | Q8. Explain why can alkali and alkaline earth metals not be obtained by chemical reduction method. bottom inente and reducing |
11 |
| 652 | Identify ( (A),(B) ) and ( (C) ) ( mathrm{Na}_{2} mathrm{SO}_{4}+ ) carbon ( longrightarrow(A) frac{mathrm{Na}_{2}left[mathrm{Fe}(mathrm{CN})_{5} mathrm{NO}right]}{longrightarrow}(B) ) (purple) [ mid mathrm{CdCO}_{3} ] ( mathbf{A} cdot(A): N a_{2} S ) (B) ( : N a_{2}left[F e(N C)_{5} N O Sright] ) ( (mathrm{C}): mathrm{CdO} ) B. (A): ( N a O_{2} ) (B): ( N a_{2}left[F e(C N)_{5} N O Sright] ) ( (mathrm{C}): C d S ) ( mathbf{C} cdot(A): N a_{2} S ) (B): ( N a_{2}left[F e(C N)_{5} N O Sright] ) ( (mathrm{C}): mathrm{Cd} S ) ( mathbf{D} cdot(mathrm{A}): N a_{2} O ) (В) : ( N a_{2}left[F e(N C)_{5} N O Sright] ) ( (mathrm{C}): P b S ) |
11 |
| 653 | um resembles magnesium in some of its properties. Mention two such properties and give reasons for this resemblance. oomblanca |
11 |
| 654 | Caustic soda is the common name for: ( mathbf{A} cdot M g(O H)_{2} ) в. КОН ( mathbf{c} cdot C a(O H)_{2} ) D. ( N a O H ) |
11 |
| 655 | Which among the following statements is incorrect for magnesium metal? A. It burns in oxygen with a dazzling white flame B. It reacts with cold water to form magnesium oxide and evolves hydrogen gas C. It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas D. It reacts with steam to form magnesium hydroxide and evolves hydrogen gas |
11 |
| 656 | Name the carbonate which is not decomposed by heating? This question has multiple correct options A. Sodium carbonate B. Potassium carbonate c. Magnesium carbonate D. None of these |
11 |
| 657 | 50 A tetravalent element forms monoxide and dioxide with oxygen. When air is passed over heated element (1273 K), producer gas is obtained. Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulae of its monoxide and dioxide. Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide. |
11 |
| 658 | Sodium hydride ( (N a H) ) when dissolved in water produces: A . acidic solution B. basic solution c. neutral solution D. cannot be predicted |
11 |
| 659 | The process associated with sodium carbonate manufacture is known as A. Chamber B. Haber c. LeBlanc D. castner |
11 |
| 660 | What is the oxidation state of ( K ) in ( K O_{2} ) ( ? ) A . -1 B. -2 ( c cdot+1 ) D. 0 |
11 |
| 661 | Q31. Which one of the following alkali metals give hydrated salts? (a) Li (b) Na (c) K (d) Cs |
11 |
| 662 | What is the natural source of ( N a_{2} C O_{3} ? ) A. Nitre B. Chile salt peter c. Dolomite D. Trona |
11 |
| 663 | A cois B. Happy Father’s Day ( c ) D. |
11 |
| 664 | When ( C O_{2} ) is bubbled through a solution of barium peroxide in water then: A. carbonic acid is formed B. ( O_{2} ) is released ( mathrm{c} cdot mathrm{H}_{2} mathrm{O}_{2} ) is formed D. no reaction occurs |
11 |
| 665 | What is the role of slaked lime and animal charcoal in the manufacture of sugar from sugarcane? |
11 |
| 666 | A covalent chloride is : A ( cdot B e C l_{2} ) B. ( N a C l ) c. ( M g C l_{2} ) D. ( C a C l_{2} ) |
11 |
| 667 | ( ” L i_{2} C O_{3} ) and ( N a_{2} C O_{3} ) are thermally stable.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
11 |
| 668 | Q21. What is soda ash? | 11 |
| 669 | Na ( 0 . H ) can also be prepared by electrolysis of aqueous ( N a C l . ) Amount of ( N a O H ) formed when ( 0.445 L ) of ( N a C l(a q) ) is electrolysed for 137 s with a current of ( 1.08 A ) is ( 0.06 g . ) The pH of this solution is : A . 11.70 B. 11.53 c. 11.83 D. data is incomplete |
11 |
| 670 | To an acidified dichromate solution, a pinch of ( N a_{2} O_{2} ) and ether is added and shaken.What is observed? A. Deep violet colour B. Red colour changing to green C. AgF is insoluble, others are soluble D. All are insoluble |
11 |
| 671 | NaOH is not produced in: A. Nelson Cell method B. Downs process c. castner kellners method D. Causticising process |
11 |
| 672 | A solid compound ‘X’ on heating gives ( C O_{2} ) gas and a residue. The residue mixed with water forms ‘Y’. On passing an excess of ( C O_{2} ) through ‘Y’ in water, a clear solution ‘Z’ is obtained. On boiling Z’, compound ‘X’ is reformed. The compound ‘X’ is : A ( cdot C aleft(H C O_{3}right)_{2} ) в. ( C a C O_{3} ) c. ( N a_{2} C O_{3} ) D. ( K_{2} C O_{3} ) |
11 |
| 673 | The purpose of exhaust system in lime kilns where the decomposition of limestone takes place is to: A. drive away, ( C O_{2} ) gas and make the reaction proceed for completion. B. reduce the temperature of the reaction c. to make the reaction attain equilibrium in less time D. all the above |
11 |
| 674 | Chemical formula of baking soda is: A. ( M g S O_{4} ) в. ( N a_{2} C O_{3} ) c. ( N a H C O_{3} ) D. ( M g C O_{3} ) |
11 |
| 675 | All alkali metals dissolve in anhydrous liquid ammonia to give a blue color solution. It is the ammoniated electron which is responsible for the blue color of the solution, and the electrical conductivity is due to ammoniated cation, ( left[Mleft(N H_{3}right)_{x}right]^{+} ) as well as the ammoniated electron, ( left[eleft(N H_{3}right)_{y}right]^{-} ) values of ( x ) and ( y ) depend on the extent of solvation by ( N H_{3} . ) Dilute solutions are paramagnetic due to free ammoniated electrons. What happens if alkali metals are allowed to react with concentrated liquid ammonia? A. Paramagnetic character of solvated electrons is retained. B. Solvated electrons associate to form electron-pairs and paramagnetic character decreases c. Reducing character is increased. D. Reducing character is not affected. |
11 |
| 676 | Out of ( B e^{2+}, M g^{+} ) and ( C a, B e^{2+} ) has maximum IE. If true enter 1 , else enter 0 . |
11 |
| 677 | ( boldsymbol{X}+boldsymbol{C}+boldsymbol{C l}_{2} stackrel{text { High Temp. }}{boldsymbol{Y}} boldsymbol{H}+boldsymbol{C O} ) ( boldsymbol{Y}+mathbf{2} boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{Z}+mathbf{2} boldsymbol{H} boldsymbol{C l} ) Compound Y is found in polymeric structure and is an electron deficient molecule. The compound Y is: A. ( B e O ) в. ( B e C l_{2} ) ( mathbf{c} cdot B e(O H)_{2} ) D. ( B e O . B e(O H)_{2} ) |
11 |
| 678 | The single-bonded metallic radius of sodium is 157 pm. Assume that the increment between radii of different magnitudes is 60 pm.The van der Waals’ radius ( N a ) in ( mathrm{pm} ) is ( (209+x) ) Find value of ( boldsymbol{x} ) |
11 |
| 679 | The magnetic quantum number of the valence electron of sodium is: A . 2 B. 3 c. 1 ( D ) |
11 |
| 680 | The chemical formula of plaster of paris is: A ( cdot C a S O_{4} cdot 2 H_{2} O ) в. ( operatorname{CaSO}_{4} ) ( mathrm{c} cdot mathrm{CaSO}_{4} cdot mathrm{H}_{2} mathrm{O} ) ( ^{mathrm{D}} cdot_{C a S O_{4}} cdot frac{1}{2} H_{2} O ) |
11 |
| 681 | On dissolving smaller (less than 3M) amount of sodium metal in liquid ammonia at low temperature, which one of the following does not occur? A. Blue coloured solution is obtained B. Ammoniated ( N a^{+} ) ions are formed in the solution. c. Liquid ammonia becomes good conductor of electricity D. Liquid ammonia remains diamagnetic. |
11 |
| 682 | Assertion Alkali metals dissolves in liquid ammonia to give blue solution Reason Alkali metals in liquid ammonia give solvated species of the type ( left[mathbf{M}left(mathbf{N} mathbf{H}_{3}right)_{mathbf{n}}right]^{+}(mathbf{M}= ) alkali metals) A. Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion B. Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion c. The Assertion is correct but the Reason is incorrect D. The Assertion is incorrect but the Reason is correct |
11 |
| 683 | Final setting time of cement should not be more than: A. 1 hour B. 2 hours c. 5 hours D. 10 hours |
11 |
| 684 | What is the correct formula for lithium fluoride? A . ( L i F ) в. ( L i_{2} F_{2} ) ( mathbf{c} cdot L i_{3} F_{9} ) D. ( L i F_{7} ) E ( . L i_{7} F_{19} ) |
11 |
| 685 | In a bakery, baking powder was not added while preparing cake. The cake obtained was hard and small in size. What is the reason for this? |
11 |
| 686 | The substance known as soda ash is ( N a_{2} C O_{3} ) A. True B. False |
11 |
| 687 | Anhydrous magnesium chloride is obtained by heating the hydrated salt with dry A. HCl. в. Nacı ( c cdot ) both D. none |
11 |
| 688 | Mg is present in A . Chlorophy B. Haemoglobin c. Vitamin-12 D. Vitamin-B |
11 |
| 689 | When ( L i N O_{3} ) is heated, it gives oxide, ( boldsymbol{L} boldsymbol{i}_{2} boldsymbol{O}, ) whereas other alkali metal nitrates decompose to give corresponding: A . nitrite B. peroxide c. both nitrite and oxide D. none of these |
11 |
| 690 | The constituent present in baking powder is: A. sodium benzoate B. acetic acid c. sodium lactate D. tartaric acid |
11 |
| 691 | Which of the following can dissolve limestone? A. ( C O_{2}+H_{2} O ) в. ( N a O H_{2}+H_{2} O ) c. ( N H_{3}+H_{2} O ) D. None of these |
11 |
| 692 | “Chlorination of calcium hydroxide produces bleaching powder”. If true enter ( 1, ) if false enter 0 | 11 |
| 693 | The baking soda formula is : A. ( K_{2} C O_{3} ) в. ( N a H C O_{3} ) c. both a and D. none of these |
11 |
| 694 | “Of the alkali metals, only Na forms nitrides.” Answer whether the above statement is true or false. If true enter 1 , else enter 0 |
11 |
| 695 | Q16. Starting with sodium chloride how would you proceed to prepare. (i) Sodium metal (ii) Sodium hydroxide (iii) Sodium peroxide (iv) Sodium carbonate? |
11 |
| 696 | The reaction used to prepare ( N a O H ) from ( C a(O H)_{2} ) in earlier days is: ( N a_{2} C O_{3}+C a(O H)_{2} rightarrow 2 N a O H+ ) ( boldsymbol{C a C O}_{3} downarrow ) If true enter 1 , else enter 0 . |
11 |
| 697 | Which statement is correct for alkaline earth metals? A. They are diatomic and form ions of the type ( M^{2} ) B. They are highly electronegative elements c. They are monoatomic in vapour state and form ions of the type ( M^{2+} ) D. They are diatomic and form ions of the type ( M^{2+} ) |
11 |
| 698 | The main raw materials required for the manufacture of portland cement are: A. limestone and clay B. limestone and gypsumm c. limestone and calcium chloride D. limestone and silica |
11 |
| 699 | “While comparison of ( L i^{+} ) and ( N a^{+} ) salts in terms of property of complex formation we found that ( left[boldsymbol{L} boldsymbol{i}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right] ) exists and ( N a ) does not form any complex.” Answer whether the above statement is true or false. If true enter 1 , else 0 |
11 |
| 700 | Q20. Which alkaline earth metals do not impart colour to the flame? | 11 |
| 701 | Which of the following is the formula of Sorel’s cement? A. ( K C l cdot M g C l_{2} cdot 6 H_{2} O ) в. ( M g C l_{2} cdot 5 M g O cdot x H_{2} O ) ( mathbf{c} cdot operatorname{CaSO}_{4} cdot 2 H_{2} O ) D. ( M g C O_{3} cdot C a C O_{3} ) |
11 |
| 702 | Peroxides of alkali metals are: A. Paramagnetic c. Acidic in nature D. Amphoteric in nature |
11 |
| 703 | Which of the following alkali metal ions has lowest ionic mobility in aqueous solution? ( mathbf{A} cdot R b^{+} ) в. ( C a^{+} ) c. ( N a^{+} ) ( mathbf{D} cdot L i^{+} ) |
11 |
| 704 | Molecular formula of sodium hydride is A. ( mathrm{NaH}_{3} ) в. ( mathrm{Na}_{2} mathrm{H}_{2} ) c. ман D. ( mathrm{Na}_{2} mathrm{H} ) |
11 |
| 705 | Calcium oxide is usually made by the thermal decomposition of materials, such as limestone or seashell, that contain calcium carbonate in a lime kiln. A. True B. False |
11 |
| 706 | D u) 15 10. Which of the following is used in photoelectric cells? (a) Na (6) K (c) Li (d) Cs |
11 |
| 707 | The alkali metal that reacts with nitrogen directly to form nitride is: A ( . L i ) в. ( N a ) c. ( K ) D. ( R b ) |
11 |
| 708 | ( Z n C O_{3} ) is thermally more stable than ( M g C O_{3}, ) because A ( cdot M g(O H)_{2} ) exhibits only properties while ( Z n(O H)_{2} ) is amphoteric B. polarising action of ( Z n^{2+} ) with 18 -electron configuration on the anion is larger than that of ( M g^{2} ) with a noble-gas electron configuration and of same size and charge c. both (a) and (b) are correct D. none of the above is correct |
11 |
| 709 | The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because: A. there is increase in the nuclear charge of the alkaline earth metal B. there is decrease in the nuclear charge of the alkaline earth metal c. there is no change in the nuclear charge D. none ofthe above |
11 |
| 710 | 2.7 Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is (a) BeCl2 (b) MgCl2 (c) CaCl, (d) SrCl2 |
11 |
| 711 | Magnesium powder burns in air to give: A. ( M g O ) only в. ( M g O ) and ( M gleft(N O_{3}right)_{2} ) c. ( M g O ) and ( M g_{3} N_{2} ) D. ( M gleft(N O_{3}right)_{2} ) and ( M g_{3} N_{2} ) |
11 |
| 712 | Alkali metals are characterised by: This question has multiple correct options A. good conductor of heat and electricity B. high oxidation potential C. high melting point D. solubility in liquid ammonia |
11 |
| 713 | ( L i A l H_{4} ) is obtained by reacting an excess of ( quad ) with an ethereal solution of ( boldsymbol{A} boldsymbol{l} boldsymbol{C l}_{3} ) A. Licl в. LiН c. ( L i ) D. ( L i O H ) |
11 |
| 714 | When ( C l_{2} ) is passed through moist slaked lime, the compound formed is : A. ( C a O_{2} C l_{2} ) в. ( C a O_{2} C l ) c. ( C a O C l ) D. ( operatorname{CaCl}_{2} mathrm{O}_{4} ) |
11 |
| 715 | Q. 40 What is the structure of BeCl, molecule in gaseous and solid state | 11 |
| 716 | What is the value of electron gain enthalpy of ( N a^{+} ) if ( I E_{1} ) of ( N A=5.1 e V ) ( ? ) A. ( -5.1 e V ) В. ( -10.2 e V ) ( mathbf{c} .+2.55 e V ) D. ( +10.2 e V ) |
11 |
| 717 | 5. In the Solvay process (a) an ammoniacal brine solution is carbonated with CO,, forming NaHCO3 which on decomposition at 150°C produces Na,CO, (b) a sodium amalgum reacts with water to produce NaOH which gives Na CO, on reacting with CO2 (c) A brine solution is made to react with BaCO3 to produce Na CO2 (d) all of the above |
11 |
| 718 | The alkaline earth metal ion that has least electrical conductivity in aqueous solutions is: ( mathbf{A} cdot B a^{++} ) B. ( C a^{+} ) ( mathbf{c} cdot B e^{++} ) D. ( C s^{+}+ ) |
11 |
| 719 | Assertion Be ( (text { O } H) ) a dissolves in excess NaOH solution. Reason Be ( (O H) ) a is an acidic compound. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
| 720 | Caustic alkalis are corrosive. A. True B. False |
11 |
| 721 | Cement is manufactured from: A . clay B. limestone c. sodium chloride D. both A and B |
11 |
| 722 | In the hardening stage of plaster of paris, the compound formed is : A. ( operatorname{CaSO}_{4} ) B. orthorhombic ( C a S O_{4} .2 H_{2} O ) ( mathrm{c} cdot mathrm{CaSO}_{4} cdot mathrm{H}_{2} mathrm{O} ) D. monoclinic ( C a S O_{4} .2 H_{2} O ) |
11 |
| 723 | Q. 30 When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K. |
11 |
| 724 | The reaction ( boldsymbol{C a} boldsymbol{C O}_{3}(boldsymbol{s}) Leftrightarrow boldsymbol{C a O}(boldsymbol{s})+ ) ( C O_{2}(g) ) goes to completion in lime kiln. A. True B. False |
11 |
| 725 | Which of the following substances are formed when lithium is heated in air? A ( . L i_{2} O+L i O_{2} ) в. ( L i_{2} O_{2} ) c. ( L i O_{2} ) D. ( L i_{2} O+L i_{3} N ) |
11 |
| 726 | A compound of sodium does not give ( C O_{2} ) when heated but it gives ( C O_{2} ) when treated with dilute acids. A crystalline compound is found to have 37.1% Na and 14.52% ( boldsymbol{H}_{mathbf{2}} boldsymbol{O} ). Hence, the compound is : A. ( N a H C O_{3} .10 H_{2} O ) B. ( N a H C O_{3} .5 H_{2} O ) c. ( N a_{2} C O_{3} .10 H_{2} O ) D. ( N a_{2} C O_{3} . H_{2} O ) |
11 |
| 727 | Portland cement does not contain: A. ( C a_{3} A l_{2} O_{6} ) в. ( C a_{2} ) Si ( O_{3} ) ( mathbf{c} cdot C a_{2} S i O_{4} ) D. ( C a_{3}left(P O_{4}right)_{2} ) |
11 |
| 728 | Assertion ( boldsymbol{L i I}+boldsymbol{K} boldsymbol{F} rightarrow boldsymbol{L} boldsymbol{i} boldsymbol{F}+boldsymbol{K} boldsymbol{I}: ) This reaction is spontaneous in forward side. Reason The larger anion stabilizes larger cation |
11 |
| 729 | The hydration energy of ( M g^{2+} ) is greater than that of : A ( . A 1^{3} ) В. ( N a^{+} ) ( c cdot B e^{3} ) D. ( M g^{3+} ) |
11 |
| 730 | The thermal stability of alkaline earth metal carbonates- ( M g C O_{3}, C a C O_{3}, S r C O_{3} ) and ( B a C O_{3} ) follows the order: A. ( B a C O_{3}>S r C O_{3}>C a C O_{3}>M g C O_{3} ) в. ( C a C O_{3}>S r C O_{3}>M g C O_{3}>B a C O_{3} ) с. ( M g C O_{3}>C a C O_{3}>S r C O_{3}>B a C O_{3} ) D. ( B a C O_{3}>S r C O_{3}>M g C O_{3}>C a C O_{3} ) |
11 |
| 731 | Diagonal relationship of elements in due to same: A . size B. mass number c. atomic number D. electron affinity |
11 |
| 732 | Q. 23 Several sodium compounds find use in industries. Which of the following compounds are used for textile industry? (a) Na Co, (b) NaHCO3 . (C) NaOH. d) NaCl |
11 |
| 733 | Which of the following is the chemical formula for washing soda? A. ( C a O ) в. ( N a_{2} C O_{3} ) c. ( N H_{2} C l ) D. ( M g C l_{2} ) |
11 |
| 734 | On treatment with cold water, an element (A) reacts readily liberating a colorless, odorless gas ( (mathrm{B}) ) and ( mathrm{a} ) solution (C). Lithium is reacted with (B) yielding a solid product (D) which effervescence with water to give a strongly basic solution (E). When ( C O_{2} ) gas is bubbled through the solution ( (mathrm{C}) ) a white ppt (F) is formed but this redissolved forming solution (G) when more ( C O_{2} ) is passed. The precipitate (F) effervesced when moistened with conc. ( H C l ) and give deep red coloration to the Bunsen burner flame.(F) on heating with an excess of carbon at ( 2000^{circ} mathrm{C} ) give (H). Metal (A) may be: ( A cdot B e ) B. ( c a ) ( c cdot s r ) D. Ba |
11 |
| 735 | Chemical name and formula of washing soda is hydrated sodium carbonate and ( N a_{2} C O_{3} .10 H_{2} O ) respectively A. True B. False |
11 |
| 736 | The addition of which metal into liquid ( N H_{3} ) leads to the formation of a blue solution: This question has multiple correct options A ( . L i ) в. ( S r ) c. ( C s ) D. ( B a ) |
11 |
| 737 | The cementation process is: A. gel formation B. emulsion formation c. both of ( A ) and ( B ) D. none of the above |
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| 738 | Match the species in Column I with their corresponding property(ies) in Column II. | 11 |
| 739 | Q. 34 Discuss the trend of the following (i) Thermal stability of carbonates of Group 2 elements. (ii) The solubility and the nature of oxides of Group 2 elements |
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| 740 | Potassium when heated strongly in oxygen, it forms: в. ( K O_{2} ) ( mathrm{c} cdot mathrm{K}_{2} mathrm{O}_{2} ) D. ( K O_{3} ) |
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| 741 | When caustic soda is manufactured from sea water, one of the important by- products is: A . potash B. chlorine c. chromium D. fertilizer |
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| 742 | Q3. Name the compounds used for the manufacture of washing soda by Solvay process. A M ONTT |
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| 743 | When Mg is burnt in air and they are decomposed by ( boldsymbol{H}_{2} boldsymbol{O}, boldsymbol{M} boldsymbol{g} boldsymbol{O}, boldsymbol{M} boldsymbol{g}_{3} boldsymbol{N}_{2} ) changing to ( M g(O H)_{2} ) and ( N H_{3} ). If true enter 1 , else enter 0 |
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| 744 | Choose the correct answer form the alternatives given. All alkali halides are soluble in water |
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| 745 | A chemical A is used for the preparation of washing soda to recover ammonia. When ( C O_{2} ) is bubbled through an aqueous solution of ( A, ) the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of ( A ) ? A ( cdot C aleft(H C O_{3}right)_{2} ) в. ( C a O O ) ( mathbf{c} cdot C a(O H)_{2} ) D. ( C a C O_{3} ) |
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| 746 | Q3. Why are alkali metals not found in nature? | 11 |
| 747 | ( boldsymbol{C a}(boldsymbol{O H})_{2} ) is formed when calcium oxide dissolves in water A. True B. False |
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| 748 | The hydride ion ( H^{-} ) is stronger base than its hydroxide ion ( O H^{-} . ) Which of the following reaction will occur if sodium hydride is dissolved in water? A ( cdot H_{(a q)}^{-}+H_{2} O rightarrow H_{3} O^{+} ) B. ( H_{(a q)}^{-}+H_{2} O rightarrow O H^{-}+H_{2} ) c. ( H^{-}+H_{2} O rightarrow H_{2}+O_{2} ) D. ( H^{-}+H_{2} O rightarrow ) No reaction |
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| 749 | Washing soda loses its crystal structure quickly | 11 |
| 750 | Baking powder contains baking soda and: A. potassium hydrogen tartarate B. calcium bicarbonate c. sodium carbonate D. vinegar |
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| 751 | As per given sequence of reaction, His: [ begin{aligned} mathrm{Ca}+mathrm{H}_{2} & frac{Delta}{Delta} rightarrow mathrm{F} text { (Solid) } \ (mathrm{F})+mathrm{CaCl}_{2} & longrightarrow(mathrm{G}) text { Solid } \ (mathrm{G})+mathrm{H}_{2} mathrm{O} & longrightarrow(mathrm{H}) text { gas } end{aligned} ] ( mathbf{A} cdot H C l ) в. ( C a H C l ) ( c cdot C l_{2} ) D. ( H_{2} ) |
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| 752 | Alkaline earth metals have higher melting points than alkali metals. If this is true enter 1 , if false enter 0 . |
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| 753 | 43. Find the odd one: (1) Marble (2) Chalk (3) Limestone (4) Slaked lime |
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| 754 | When ( Z n ) is treated with excess of NaOH, the product obtained is : A. ( Z n(O H)_{2} ) в. ( Z n O H ) c. ( N a_{2} Z n O_{2} ) D. none of these |
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| 755 | The reaction of ( N a C l ) and ( C a C O_{3} ) gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction. A. True B. False |
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| 756 | A piece of magnesium ribbon was heated to redness in nitrogen gas and then dropped into water. The gas evolved is: A ( . N H_{3} ) в. ( H_{2} ) ( c cdot O_{2} ) D. ( N_{2} ) |
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| 757 | The most stable carbonate among the following is : A ( cdot L i_{2} C O_{3} ) в. ( N a_{2} C O_{3} ) ( mathbf{c} cdot R b_{2} C O_{3} ) D. ( C s_{2} C O_{3} ) |
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