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Question

Which substance acts as a reducing agent in the following reaction
14H++Cr2O2−7+2Cr3++7H2O+3Ni2+

A
H2O
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B
Ni
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C
H+
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D
Cr2O27
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Solution

The correct option is B Ni
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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