Which of the following reactions are comproportionation reactions?

2 H_{2} S (g) + S O_{2} (g) \to 3 S (s) + 2 H_{2} O (g)

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2 A g^{2 +} (a q) + A g (s) \to 2 A g^{+} (g)

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C a C O_{3} (s) Δ \to C a O (s) + C O_{2} (g)

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H_{2} (g) + I_{2} (g) \to 2 H I (g)

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Solution

The correct options are
A $2 H_{2} S (g) + S O_{2} (g) \to 3 S (s) + 2 H_{2} O (g)$
B $2 A g^{2 +} (a q) + A g (s) \to 2 A g^{+} (g)$
A reaction in which an element in a higher oxidation state reacts with the same element in a lower oxidation state to give the element in an intermediate oxidation state is known as comproportionation or symproportionation.
In option A:
$2 H_{2} - 2 S (g) + + 4 S O_{2} (g) \to 3 0 S (s) + 2 H_{2} O (g)$
Sulphur in $- 2$ and $+ 4$ oxidation states changes to $0$ oxidation state.
In option B:
$2 A g^{2 +} (a q) + 0 A g (s) \to 2 A g^{+} (g)$
Here silver in $+ 2$ and $0$ states changes to $+ 1$ state.

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