# 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 $HNO_2$

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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