What coefficient of $A g N O_{3}$ is required to balance the following equation?
$C u + A g N O_{3} \to C u (N O_{3})_{2} + A g$

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Solution

The correct option is B $2$
Balance $N$ and $O$ in the reaction by writing $2$ before $A g N O_{3}$ .
$N, O, C u$ is balanced but not $A g .$
Balance $A g$ by writing $2$ before $A g$ on right side. Balanced chemical reaction is.
$C u + 2 A g N O_{3} ⟶ C u {(N O_{3})}_{2} + 2 A g .$

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