Which of the following is an example of a disproportionation reaction?

C a C O_{3} ⟶ C a O + C O_{2}

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2 H C u {C l}_{2} ⟶ C u + {C u}^{2 +} + 4 {C l}^{-} + 2 H^{+}

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P {C l}_{5} ⟶ P {C l}_{3} + {C l}_{2}

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2 H_{2} S + S O_{2} \to 2 H_{2} O + 3 S

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Solution

The correct option is B $2 H C u {C l}_{2} ⟶ C u + {C u}^{2 +} + 4 {C l}^{-} + 2 H^{+}$
$2 H C u {C l}_{2} ⟶ C u + {C u}^{2 +} + 4 {C l}^{-} + 2 H^{+}$
+1 0 +2
So, it is a disproportionation reaction.
$2 H_{2} S + S O_{2} \to 2 H_{2} O + 3 S$
-2 +4 0
It is a reverse disproportionation reaction.
All other reactions are not even redox reactions.

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