Divide the following redox reactions into oxidation and reduction half reactions.

(i) $Z n + P b^{2} \to Z n^{2} + P b$

(ii) $Z n + C u^{2 +} \to Z n^{2} + C u$

(iii) $C l_{2} + 2 B r^{-} \to B r_{2} + 2 C l^{-}$

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Solution

(i)

Oxidation reaction

$Z n \to Z n^{2 +} + 2 e^{-}$

Reduction reaction

$P b^{2 +} + 2 e^{-} \to P b$

(ii)

Oxidation reaction

$Z n \to Z n^{2 +} + 2 e^{-}$

Reduction reaction

$C u^{2 +} + 2 e^{-} \to C u$

(iii)

Oxidation reaction

$2 B r^{-} \to B r_{2} + 2 e^{-}$

Reduction reaction

$C l_{2} + 2 e^{-} \to 2 C l^{-}$

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