HNO2 acts both as reductant and oxidant, while HNO3 acts only as oxidant. It is due to their [AIIMS 2000]
(1) Solubility ability
(2) Maximum oxidation number
(3) Minimum oxidation number
(4) Minimum number of valence electrons
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(2) In HNO2∗ oxidation number of N = + 3
In HNO3∗ oxidation number of N = + 5.