Write the anode reaction, the cathode reaction and the net cell r… - Vidyadip

Question

Write the anode reaction, the cathode reaction and the net cell reaction in the following cells. Which electrode would be positive terminal in each cell ?
i. $\mathrm{Zn}(\mathrm{s})\left|\mathrm{Zn}^{2+}\right|\left|\mathrm{Br}^2\right| \mathrm{Br}^- \mid \mathrm{Pt}(\mathrm{s})$
ii. $\mathrm{Cr}(\mathrm{s})\left|\mathrm{Cr} 3+\left|\left|\mathrm{I}_2\right| \mathrm{I}^{-}\right| \mathrm{Pt}(\mathrm{s})\right.$
iii. $\mathrm{Pt}(\mathrm{s})\left|\mathrm{H}_2(\mathrm{~g})\right| \mathrm{H}^{+}(\mathrm{aq})| | \mathrm{Cu}^{2+} \mid \mathrm{Cu}(\mathrm{s})$

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Answer

$_{\begin{matrix}\text{At anode}\\\text{At cathode}\end{matrix}}{\text{Zn}\xrightarrow{\ \ \ \ \ \ }\text{Zn}^{2+} +2\text{e}^{-}\\\text{Br}_{2}+ 2\text{e}^{-}\xrightarrow{\ \ \ \ \ \ }2\text{Br}^{-}\\ \overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\ \text{Zn}+ \text{Br}_{2}\xrightarrow{\ \ \ \ \ }\text{Zn}^{2+}+2\text{Br}^{-}\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }}$
$_{\begin{matrix}\text{At anode}\\\text{At cathode}\end{matrix}} {[\text{Cr}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{Cr}^{3+}+3\text{e}^-]\times2\\ [\text{I}_2+\text{e}^-\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }2\text{I}^-]\times3\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\ \text{2Cr}+3\text{I}_2\xrightarrow{\ \ \ \ \ \ \ \ }6\text{I}^-+2\text{Cr}^{3+}\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }}$
$_{\begin{matrix}\text{At anode}\\\text{At cathode}\end{matrix}}{\text{H}_2\text{(g)} \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }2\text{H}^+\text{(aq)}+2\text{e}^-\\\text{Cu}^{2+}\text{(aq)}+2\text{e}^-\xrightarrow{\ \ \ \ \ \ \ \ }\text{Cu}(\text{s}) }\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\{\text{H}_2\text{(g)}+\text{Cu}^{2+}\text{(aq)}\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{Cu}(s)+2\text{H}^+\text{(aq)}}\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$

Cathode will be positive terminal in each cell.

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