Which of the following statements is true?

  • Option 1)

    H_{3}PO_{3}  is a stronger acid than H_{2}SO_{3}

  • Option 2)

    In aqueous medium HF is a stronger acid than HCl

  • Option 3)

    HClO_4  is a weaker acid than HClO_3

  • Option 4)

    HNO_3  is a stronger acid than HNO_2

 

Answers (1)

As we learnt in 

Acidity of nitric acid -

Strong acid, in aqueous solution gives hydronium and nitrate ions

- wherein

HNO_{3}+H_{2}O\rightarrow H_{3}O^{+}+NO_{3}^{-}

 

 Let's look at conjugate bases of HNO3 and HNO2

The negative charge is more delocalized on NO3- making it a more stable conjugate base.


Option 1)

H_{3}PO_{3}  is a stronger acid than H_{2}SO_{3}

This option is incorrect.

Option 2)

In aqueous medium HF is a stronger acid than HCl

This option is incorrect.

Option 3)

HClO_4  is a weaker acid than HClO_3

This option is incorrect.

Option 4)

HNO_3  is a stronger acid than HNO_2

This option is correct.

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