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In which of the following reactions, nitrogen is not reduced?
(A) \( \mathrm{NO}_{2} \longrightarrow \mathrm{NO}_{2}^{+} \)
(B) \( \mathrm{NO}_{3}^{-} \longrightarrow \mathrm{NO} \)
(C) \( \mathrm{NO}_{3}^{-} \longrightarrow \mathrm{NH}_{4}^{+} \)
(D) \( \mathrm{NH}_{4}^{+} \longrightarrow \mathrm{N}_{2} \)
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