To remove the polarisation defect in Daniel cell ?

Zinc rod is coated with a thin layer of mercury

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Potassium bi-chromate is used

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The cell should be kept in open air

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Copper-sulphate is used

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Solution

The correct option is D Copper-sulphate is used
A depolarizer in electrochemistry is a synonym of electroactive substance, i.e., a substance which changes its oxidation state, or partakes in a formation or breaking of chemical bonds, in a charge-transfer step of an electrochemical reaction. In the cells, the term "depolarizer" has been used to denote a substance used in a primary cell to prevent buildup of hydrogen gas bubbles.
The hydrogen ions displace metal from the salt so that metal, instead of hydrogen, is deposited on the positive plate. For example, copper-sulphate in Daniel cell.

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