Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The quantum number m of a free gaseous atom is associated with

  • the effective volume of the orbital

  • the shape of the orbital

  • the spatial orientation of the orbital

  • the energy of the orbital in the absence of a magnetic field.


12.

In which of the following acid-base titration, pH is greater than 8 at equivalence point?

  • Acetic acid versus ammonia

  • Acetic acid versus sodium hydroxide

  • Hydrochloric acid versus ammonia

  • Hydrochloric acid versus sodium hydroxide


13.

The potential energy diagram for a reaction R → P is given in the figure. H ° of the reaction corresponds to the energy

  • a

  • b

  • c

  • a + b


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14.

Assertion : NF3 is a weaker ligand than N(CH3).

Reason : NF3 ionizes to give F- ions in aqueous solution.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


C.

If assertion is true but reason is false.

Due to high cleclronegativity of F-atoms, the lone pair of N-atom in NF3 molecule cannot be ligated easily.

Except, nitrogen fluoride, all other halides hydrolyse in water.

NCl3 + 3H2O → NH3 + 3HClO


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15.

Assertion : Mg1122 emits a positron giving Mg1222.

Reason : In β+ emission neutron is transformed into proton.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


16.

Assertion : Barium is not required for normal biological function in human.

Reason : Barium does not show variable oxidation state.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


17.

Assertion : The increase in internal energy (E) for the vapourization of one mole of water at 1 atm and 373 K is zero.

Reason : For all isothermal processes, E = 0.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


18.

Assertion : BaCO3 is more soluble in HNO3 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.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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19.

Assertion : H and E are almost the same for the reaction, N2(g) + O2(g) → 2NO(g)

Reason : All reactants and products are gases.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


20.

Assertion : The O - O bond length in H2O2 is shorter than that of O2F2.

Reason : H2O2 is an ionic compound.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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