The reference electrode is made from which of the following?

{Z n C l}_{2}

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{C u S O}_{4}

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{H g}_{2} {C l}_{2}

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{H g C l}_{2}

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Solution

The correct option is A ${H g}_{2} {C l}_{2}$
A reference electrode is an electrode which has a stable and well-known electrode potential. The high stability of the electrode potential is usually reached by employing a redox system with constant (buffered or saturated) concentrations of each participant of the redox reaction.
$H g_{2} C l_{2}$ or standard calomel electrode acts as reference electrode.
Hence, option C is correct.

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