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Question

Assertion: HNO3 is a stronger acid than HNO2.

Reason: In HNO3 there is two nitrogen to oxygen bonds whereas in HNO2 there is only one.


A

Both Assertion and Reason are false.

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B

Assertion is true, but Reason is false.

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C

Both Assertion and Reason are true. The reason is the correct explanation of Assertion.

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D

Both Assertion and Reason are true. The reason is not the correct explanation of Assertion.

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Solution

The correct option is B

Assertion is true, but Reason is false.


Explanation for assertion statement

Conjugate acid

  • When a proton is added to a base, a conjugate acid is formed.
  • Conjugate acids have one extra proton compared to the species that is forming it.

Conjugate base

  • When a proton is removed from an acid, a conjugate base is formed.
  • Conjugate bases have one proton less and one more negative charge compared to the species that is forming it.

Stronger acid

  • HNO3 is a stronger acid than HNO2, for the following reasons.
  • HNO3's conjugate base NO3-is more stable than HNO2's conjugate baseNO2-.
  • Because in case of NO3-, the charge is dispersed on three oxygen atoms, and in case of NO2-, the charge is dispersed on two oxygen atoms.

Explanation for reason statement

  • The structure of HNO3 is as follows:-
  • The structure of HNO2 is as follows:-
  • Hence, in HNO3 there are three oxygen is attached to nitrogen whereas in HNO2, two oxygen is attached to the nitrogen.
  • Hence, the given reason in the question is incorrect.

Hence, option(B) is the correct answer.


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