Assertion : Molecular nitrogen is less reactive than molecular ox

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Hfusion of a substance is 'x' and Hvap is 'y', then Hsublimation will be

  • x + y

  • x - y

  • x/y

  • y/x


12.

Ssurr for an exothermic reaction is

  • always positive

  • always negative

  • zero

  • may be positive or negative


13.

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?

  • 58

  • 180

  • 170

  • 145


14.

Which statement is true for ferrocene?

  • All Fe-C are of equal length.

  • C are sp2 hybridized.

  • It was the first discovered organometallic compound.

  • All of these


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15.

Assertion : C- O bond in metal carbonyl is long.

Reason : There is delocalisation of electrons from filled d orbitals into the empty orbitals on the CO ligands.

  • 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 both assertion and reason are false.


16.

Assertion : F is more electronegative than Cl.

Reason : F has high electron affinity than Cl.

  • 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 both assertion and reason are false.


17.

Assertion : Acetylene on reacting with sodamide gives sodium acetylidc and ammonia.

Reason : sp hybridised carbon atoms.

  • 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 both assertion and reason are false.


18.

Assertion : As a salt such as NaCl dissolves, the Na+ and Cl- ions leaving the crystal lattice acquire far greater freedom.

Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., H has a high positive value and TS a low negative value.

  • 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 both assertion and reason are false.


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19.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N2 is shorter than that of oxygen.

  • 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 both assertion and reason are false.


B.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Bond order of nitrogen is 3 and that of oxygen is 2. Higher the bond order, higher is the bond dissociation energy, i.e. higher stability or less reactivity. Thus N2 is less reactive than O2.

Higher the bond order, shorter is the bond length. Higher bond order of N2 shows its shorter bond length.


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20.

Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature.

Reason : The composition of the final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.

  • 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 both assertion and reason are false.


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