Assertion : HNO3 is stronger acid than HNO2.
Reason : In HNO3 there are two nitrogen to oxygen bonds where as in HNO2 there is only one.
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(C)Conjugate base of HNO3, the NO3- is more stable (charge dispersion on three oxygen atoms) than conjugate base of HNO2, the NO2- (charge dispersion on two oxygen atoms).
There are three nitrogen to oxygen bonds in HNO3 and two in HNO2.