The calomel electrode used as a reference electrode contains:

P b O_{2} - P b S O_{4}

mixture

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H g C l_{2}

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H g_{2} C l_{2}

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Z n C l_{2}

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Solution

The correct option is C $H g_{2} C l_{2}$
$\to$ Reference electrode:-Calomel is one of the most convenient secondary electrodes. The electrode whose potential is arbritarily fixed to a certain value or if it is exactly known as reference electrode.
$\to$ In Calomel electrode:- A small amount of Mercury is placed at the bottom of the broad tube.
$\to$ It is then covered with a saturated paste of Mercurous Chloride $(H g_{2} C l_{2})$ and mercury.

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