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Question

Which of the following is not a redox reaction?


A
CaCO3CaO+CO2
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B
O2+2H22H2O
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C
Na+H2ONaOH+12H2
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D
MnCl3MnCl2+12Cl2
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Solution

The correct option is A $$CaC{ O }_{ 3 }\longrightarrow CaO+C{ O }_{ 2 }$$
 $$CaC{ O }_{ 3 }\longrightarrow CaO+C{ O }_{ 2 }$$ 

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

So, the correct option is $$A$$

Chemistry

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