# NEET Chemistry The s-Block Elements Questions Solved

Which of the following acts as an oxidizing as well as a reducing agent?

(A) ${\mathrm{Na}}_{2}\mathrm{O}$

(B) ${\mathrm{NaO}}_{3}$

(C) $\mathrm{NaNO}$

(D) ${\mathrm{NaNO}}_{2}$

(D)

${\mathrm{NaNO}}_{2}$ (sodium nitrite) acts both as an oxidizing agent and reducing agent because the nitrogen

atom in it is in +3 oxidation state (+3 intermediate oxidation state for nitrogen)

Oxidizing property : $2{\mathrm{NaNO}}_{2}+2\mathrm{Kl}+2{\mathrm{H}}_{2}{\mathrm{SO}}_{4}\stackrel{}{\to }{\mathrm{NaSO}}_{4}+{\mathrm{K}}_{2}{\mathrm{SO}}_{4}+2\mathrm{NO}+2{\mathrm{H}}_{2}\mathrm{O}+{\mathrm{l}}_{2}$

Reducing property : ${\mathrm{NaNO}}_{2}+{\mathrm{H}}_{2}{\mathrm{O}}_{2}\stackrel{}{\to }{\mathrm{NaNO}}_{3}+{\mathrm{H}}_{2}\mathrm{O}.$

Difficulty Level:

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