The reference calomel electrode is made from which of the following ?

Options

A. `ZnCl_2`
B. `CuSO_4`
C. `Hg_(2)Cl_(2)`
D. `HgCl_2`

Answer

C

Explanation

Calomel electrode made from `Hg_2 Cl_2` can be used as a reference electrode.