Which reaction does not involve either oxidation or reduction?

V O^{2 +} \to V_{2} O_{3}

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N a \to N a^{+}

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C r O_{4}^{2 -} \to C r_{2} O_{7}^{2 -}

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Z n^{2 +} \to Z n

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Solution

The correct option is C $C r O_{4}^{2 -} \to C r_{2} O_{7}^{2 -}$
In $V O^{+ 2} \to V_{2} O_{3}$ , $V$ is reduced from +4 to +3 oxidation state.
In $N a \to N a^{+}$ , $N a$ is oxidised from 0 to +1 oxidation state.
In $C r O_{4}^{- 2} \to C r_{2} O_{7}^{- 2}$ , $C r$ remains in same oxidation state +6.
In $Z n^{+ 2} \to Z n$ , $Z n$ is reduced from +2 to 0 oxidation state.
So C) is only reaction which invlove neither oxidation nor reduction.

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