Which one of the following is not a redox reaction?

C a C O_{3} \to C a O + C O_{2}

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

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

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

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Solution

The correct option is C $C a C O_{3} \to C a O + C O_{2}$
In a redox reaction, the oxidation state of the atom changes with the aid of oxidation of one molecule and reduction of the other. A is not a redox reaction since the oxidation state of $C a (+ 2)$ , $C (+ 4)$ , and $O (- 2)$ is the same both in reactant as well as product

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