Which substance serves as reducing agent in the following reaction ? $14 \mathrm{H}^{+}+\mathrm{Cr}_{2}…

Which substance serves as reducing agent in the following reaction ?
$14 \mathrm{H}^{+}+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+3 \mathrm{Ni} \longrightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{Ni}^{2+}$
  1. $\mathrm{H}_{2} \mathrm{O}$
  2. $\mathrm{Ni}$
  3. $\mathrm{H}^{+}$
  4. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$

Solution

The compound undergo oxidation itself and reduces others is known as reducing agent. In this reaction $\mathrm{O}$.
N. of Ni changes from 0 to $+2$ and hence Ni acts as a reducing agent.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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