Redox Reactions - Result Question 16
####17. The following redox reaction is balanced by which set of coefficients ?
[1999]
$aZn+bNO_3^{-}+cH^{+} \to dNH_4^{+}+eH_2 O+fZn^{2+}$
\begin{tabular}{lllllll} & $\mathbf{a}$ & $\mathbf{b}$ & $\mathbf{c}$ & $\mathbf{d}$ & $\mathbf{e}$ & $\mathbf{f}$ \\
(a) & 1 & 1 & 10 & 1 & 3 & 1 \\
(b) & 2 & 2 & 10 & 2 & 3 & 2 \\
(c) & 4 & 2 & 10 & 1 & 3 & 4 \\
(d) & 4 & 1 & 10 & 1 & 3 & 4 \end{tabular}
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Solution:
- (d) $Zn \to Zn^{+2}+2 e^{-}$
$8 e^{-}+10 H^{+}+NO_3^{-} \to NH_4^{+}+3 H_2 O$
operate eq. (1) $\times 4+$ eq. (2) $\times 1$
$4 Zn+10 H^{+}+NO_3^{-} \to 4 Zn^{2+}+NH_4^{+}+3 H_2 O$
In this reaction, none of the elements undergoes a change in oxidation number or valency.
