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    CBSE

    Subject

    Chemistry
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    NEET Chemistry : The s-Block Elements

    Multiple Choice Questions

    71.

    Select the incorrect statement among the following:

    • O3 is used as germicide for purification of air

    • In O3, O-O bond length is identical with that of molecular oxygen

    • O3 molecule is angular in shape.

    • O3 is an oxidising agent

    Answer
    • 72. 'Electron' is an alloy of

    • Mg and Zn

    • Fe and Mg

    • Ni and Zn

    • Al and Zn

    Answer

    • Short Answer Type

    73.

    Write with a balanced chemical equation how gypsum is used for the conversion of ammonia into ammonium sulnate without using H2SO4 ?

    Answer

    • Multiple Choice Questions

    74.

    Of the following compounds, the most acidic is

    • As2O3

    • P2O5

    • Sb2O3

    • Bi2O3

    Answer
    • 75.

    which of the following represents the composition of carnallite mineral?

    • K2O.Al2O3.6SiO2

    • KNO3

    • K2SO4.MgSO4.MgCl2.6H2O

    • KCl.MgCl2.6H2O

    Answer
    • 76.

    Identify the correct order of solubility in aqueous medium.

    • CuS > ZnS > Na2S

    • ZnS > Na2S > CuS

    • Na2S > CuS > ZnS

    • Na2S > ZnS > CuS

    Answer
    • 77.

    Fe(OH)3 can be separated from Al(OH)3 by the addition of

    • NaCl solution

    • dil. HCl solution

    • NaOH solution

    • NH4Cl and NH4OH

    Answer
    • 78.

    Assertion : Na2SO4 is soluble in water while BaSO4 is not.

    Reason : Lattice energy of BaSO4 exceeds its hydration energy.

    • If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

    • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

    • If Assertion is true but Reason is false.

    • If Assertion is false but Reason is true.

    Answer
    • 79.

    Sodium pyrophosphate is represented by which of the following formula ?

    • Na2P2O4

    • Na4P2O5

    • Na4P2O7

    • Na2P2O5

    Answer
    • 80.

    Which one of the following processes is used for the manufacture of calcium?

    • Reduction of CaO with carbon

    • Reduction of CaO with hydrogen

    • Electrolysis of a mixture of anhydrous CaCl2 and KCl

    • Electrolysis of molten Ca(OH)2

    Answer
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