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A redox reaction among the following is

ChemistryRedox ReactionsKVPYKVPY 2016 (SA)

Options:

A $\mathrm{CdCl}_{2}+2 \mathrm{KOH} \rightarrow \mathrm{Cd}(\mathrm{OH})_{2}+2 \mathrm{KCl}$
B $\mathrm{BaCl}_{2}+\mathrm{K}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+2 \mathrm{KCl}$
C $\mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}$
D $2 \mathrm{Ca}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CaO}$