The number of electrons involved in the reduction of nitrate ion to hydrazine is

A)

8

  • B)

    7

  • C)

    5

  • D)

    3

Nitrate on reduction by acid produce hydrazine.
2NO3- + 16H+ + 14e- → NH2-NH2 + 6H2O
For reduction of two nitrogens 14 electrons are necessary.
So number of electron change per nitrogen is 14/2 = 7

So B) is the correct answer.

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