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Q.

Which of the following is not a redox reaction?

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a

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

b

$M n C l_{3} \to M n C l_{2} + \frac{1}{2} C l_{2}$

c

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

d

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

answer is A.

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Detailed Solution

No change in oxidation number of element is not a redox reaction

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