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Answer : The mercury-mercurous chloride electrode is known as the calomel electrode.
It is made up of a glass vase with a bent side tube.
The bottom of the tube is filled with pure mercury, Which is then coated with a paste of mercury-mercurous chloride, also known as calomel.
The remainder of the cell is filled with saturated KCl or decinormal (0.1 N) or a normal (1 N) solution.
The external electrical contact is provided by a platinum wire enclosed within a glass tube and immersed in a coating of mercury.
The side tube makes electrical contact with a salt bridge.
