Statement - I :HNO₃ is a stronger acid than HNO₂.
Statement - II :There are two nitrogen-oxygen bonds in HNO₃, whereas in HNO₂ there is only one such bond.

Here, the conjugate base of HNO₃ is ${\mathrm{NO}}_3^{-}$ and conjugate base of HNO₂ is ${\mathrm{NO}}_2^{-}$.
${\mathrm{NO}}_3^{-}$ is a more stable conjugate base than ${\mathrm{NO}}_2^{-}$, as it is known that a strong acid has a stable conjugate base. This means that HNO₃ is stronger than HNO₂.

In HNO₃, there are three nitrogen to oxygen bonds while in HNO₂, has two nitrogen to oxygen bonds. Therefore, the reason is incorrect.