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Question

Identify oxidant and reductant in the following reaction:
Cu+4HNO3(dil)Cu(NO3)2+2H2O+2NO

A
HNO3,Cu
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B
Cu,H2O
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C
Cu,HNO3
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D
None of these
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Solution

The correct option is A HNO3,Cu
In the following redox reaction:
Cu + 4HNO3(dil)Cu(NO3)2+2H2O+2NO
Oxidation states,
0 for Cu +5 for N +4 for Cu +2 for N

Oxidation state of Cu is increasing so it is being oxidised by HNO3. So, HNO3 is oxidant.

Oxidation state of N is decreasing so it is being reduced by Cu. So, Cu is reductant.


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