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a
CaCO3→CaO+CO2
b
O2+2H2→2H2O
c
Na+H2O→NaOH+12H2
d
MnCl3→MnCl2+12Cl2
answer is A.
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Detailed Solution
Only the reaction in which O.N. of elements changes is a Redox reaction.In the decomposition of Calcium carbonate, no atom changes its oxidation state.