Which of the following is not a redox reaction?

C a C O_{3} ⟶ C a O + C O_{2}

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O_{2} + 2 H_{2} ⟶ 2 H_{2} O

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N a + H_{2} O ⟶ N a O H + \frac{1}{2} H_{2}

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M n {C l}_{3} ⟶ M n {C l}_{2} + \frac{1}{2} {C l}_{2}

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Solution

The correct option is A $C a C O_{3} ⟶ C a O + C O_{2}$
$C a C O_{3} ⟶ C a O + C O_{2}$

The above reaction is not a redox reaction as there is no change in the oxidation number.

So, the correct option is $A$

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