Q 1470012816.     In the calomel half cell,the reduction `rx_n` is

A

`Hg_2Cl_2(s)+2e^(-) rightarrow 2Hg(l)+2Cl^(-)(aq)`

B

`Pb(s)+PbO_2+2H_2SO_4 rightarrow 2PbSO_4(s)+2H_2O(l)`

C

`2Hg+2Cl^(-) rightarrow Hg_2Cl_2+2e^(-)`

D

`Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^(-) rightarrow 2Cr^{+3}(aq)+7H_2O`

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