(B) In $NO_{2}^{+}$,the nitrogen atom is $sp$-hybridized. The $s$-character in $sp$-hybridization is $\frac{1}{2} \times 100 = 50 \%$.In $NO_{3}^{-}$,

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(B) In $NO_{2}^{+}$,the nitrogen atom is $sp$-hybridized. The $s$-character in $sp$-hybridization is $\frac{1}{2} \times 100 = 50 \%$.In $NO_{3}^{-}$,the nitrogen atom is $sp^{2}$-hybridized. The $s$-character in $sp^{2}$-hybridization is $\frac{1}{3} \times 100 = 33.3 \%$.Therefore,the percentages are $50 \%$ and $33.3 \%$ respectively.