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The number of electrons involved in the reduction of nitrate ion ( NO^-3) to hydrazine (N2H4) is

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The number of electrons involved in the reduction of nitrate ion ( NO-3) to hydrazine (N2H4) is 

(1) 8 

(2) 7

(3) 5 

(4) 3

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Best answer

The reaction is

Hence, the correct option is (2).

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