The number of electrons required to balance the equation $N O_{3}^{-} + 4 H^{+} + e^{-} \to 2 H_{2} O + N O$ is :

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Solution

The correct option is D 3
The number of electrons required to balance the equation $N O_{3}^{-} + 4 H^{+} + e^{-} \to 2 H_{2} O + N O$ is 3.
In this equation, all the atoms are balanced.
On the LHS, there are 4 positive charges and one negative charge (other than an electron) and on RHS, there are 0 charges.
The charges will be balanced when the number of electrons is 3.

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