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Question: Which of the following is a disproportionation reaction?...

Which of the following is a disproportionation reaction?

A

Cl2(g)+2OH(aq)−→ClO(aq)−+Cl(aq)−+H2O(l)Cl_{2(g)} + 2OH_{(aq)}^{-} \rightarrow ClO_{(aq)}^{-} + Cl_{(aq)}^{-} + H_{2}O_{(l)}

B

Cl2(g)+2I(aq)−→2Cl(aq)−+I2(s)Cl_{2(g)} + 2I_{(aq)}^{-} \rightarrow 2Cl_{(aq)}^{-} + I_{2(s)}

C

2Fe(s)+3H2O(l)→ΔFe2O3(s)+3H2(g)2Fe_{(s)} + 3H_{2}O_{(l)}\overset{\quad\Delta\quad}{\rightarrow}Fe_{2}O_{3(s)} + 3H_{2(g)}

D

2H2O(l)+2F2(g)→4HF(aq)+O2(g)2H_{2}O_{(l)} + 2F_{2(g)} \rightarrow 4HF_{(aq)} + O_{2(g)}

Answer

Cl2(g)+2OH(aq)−→ClO(aq)−+Cl(aq)−+H2O(l)Cl_{2(g)} + 2OH_{(aq)}^{-} \rightarrow ClO_{(aq)}^{-} + Cl_{(aq)}^{-} + H_{2}O_{(l)}

Explanation

Solution

: Cl2(g)0+2OH(aq)−→ClO(aq)−+1+Cl−−1(aq)+H2O(l)\overset{0}{Cl_{2(g)}} + 2OH_{(aq)}^{-} \rightarrow \overset{+ 1}{ClO_{(aq)}^{-}} + {\overset{- 1}{Cl^{-}}}_{(aq)} + H_{2}O_{(l)}

Chlorine is simultaneously reduced and oxidised.