Which substance serves as a reducing agent in the following reaction, \[ 14 \mathrm{H}^{+}+\math...
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0Which substance serves as a reducing agent in the following reaction,
\[
14 \mathrm{H}^{+}+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+3 \mathrm{Ni} \longrightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{Ni}^{2+} ?
\]
(A) \( \mathrm{H}_{2} \mathrm{O} \)
(B) \( \mathrm{N} \)
(C) \( \mathrm{H}^{+} \)
(D) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
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