Question

# Which of the following is not a redox reaction?

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

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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