The calomel electrode is reversible with repect to :

Options

A. `Hg`
B. `H^(+)`
C. `Hg^(2+)`
D. `Cl^(-)`

Answer

D

Explanation

Calomel electrode reaction,
`1//2Hg_(2)Cl_(2(s))+e^(-)hArr Hg_((l))+Cl_((aq.))^(-)`
Calomel electode.
`E_(Cl^(-)//Hg_(2)Cl_(2)//Hg)`
`E_(Cl^(-)//Hg_(2)Cl_(2)//Hg) + (2.303RT)/(F)log[Cl^(-)]`
Thus calomel electrdoe funcations as the reversible chloride electrode.