A blue color appears on addition of aqueous ammonia to aqueous \( \mathrm{CuSO}_{4} \) due to re...

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A blue color appears on addition of aqueous ammonia to aqueous \( \mathrm{CuSO}_{4} \) due to reaction
\[
\mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} \rightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}
\]
In this reaction,
(A) copper is oxidized.
(B) copper is reduced.
(C) ammonia is reduced.
(U) None of these.
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