Answer
Please see the work below.
Work Step by Step
We know that the required reactions are:
a. $K^+ +e^-\rightarrow K$
$2Cl^{-} \rightarrow Cl_2+2e^-$
b. $K^++e^-\rightarrow K$
$4OH^-\rightarrow O_2+2H_2O+4e^-$
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