A) \[ZnC{{l}_{2}}\]
B) \[CuS{{O}_{4}}\]
C) \[H{{g}_{2}}C{{l}_{2}}\]
D) \[HgC{{l}_{2}}\]
Correct Answer: C
Solution :
Calomel electrode is used as the secondary reference electrode and involves the following reaction at the cathode \[H{{g}_{2}}C{{l}_{2}}(s)+2{{e}^{-}}\xrightarrow{{}}2Hg(l)+2C{{l}^{-}}\]
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