Which one of the following reactions is not an example of redox reaction

C l_{2} + 2 H_{2} O + S O_{2} \to 4 H^{+} + S O_{4}^{2 -} + 2 C l^{-}

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C u^{+ +} + Z n \to Z n^{+ +} + C u

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

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H C l + H_{2} O \to H_{3} O^{+} + C l^{-}

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Solution

The correct option is D $H C l + H_{2} O \to H_{3} O^{+} + C l^{-}$
In reaction $H C l + H_{2} O \to H_{3} O^{+} + C l^{-}$ , there is no reduction or oxidation happening! Just ionisation, look at this carefully.

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