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Oxidising Reagent and Reducing Reagent

Which substan...

Question

Which substance acts as a reducing agent in the following reaction
$14 H^{+} + C r_{2} O_{7}^{2 -} + 2 C r^{3 +} + 7 H_{2} O + 3 N i^{2 +}$

A

H_{2} O

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B

N i

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C

H^{+}

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D

C r_{2} O_{7}^{2 -}

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Solution

The correct option is B $N i$
The oxidation number of Ni changes from 0 to +1. Since it is getting oxidised, it must be the reducing agent.

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