For which of these oxidation/reduction pairs will the reduction potential vary with $p H$ ?
I. $A m O_{2}^{2 +} / A m O_{2}^{+}$ II. $A m O_{2}^{2 +} / A m^{4 +}$ III. $A m^{4 +} / A m^{2 +}$ .

I only

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II only

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I and II only

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I, II and III

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Solution

The correct option is B II only
$4 H^{+} + A m O_{2}^{2 +} + 2 e^{-} \to A m^{4 +} + 2 H_{2} O$ .
It includes $H^{+}$ ions; hence the electrode potential depends on $p H$ .

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