For reaction (a):
- \(\text{Cl}_2(g) + 2e^- \rightarrow 2\text{Cl}^-(aq)\); \(E^\circ = +1.36 \, \text{V}\)
- \(\text{Br}_2(l) + 2e^- \rightarrow 2\text{Br}^-(aq)\); \(E^\circ = +1.07 \, \text{V}\)
For reaction (b):
- \(\text{Ni}^{2+}(aq) + 2e^- \rightarrow
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