Redox and Equivalent ConceptHard

Question

In the process, NO2− → NH3, the number of OH– ions and the side in which they should be added in balancing are

Options

A.7, right
B.7, left
C.4, left
D.5, right

Solution

$NO_{2}^{-} + 5H_{2}O + 6e^{-} \rightarrow NH_{3} + 7OH^{-}$

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