Among $N a, H g, S, P t$ and graphite, which can be used as electrodes in electrolytic cells having aqueous solutions?

H g

and

P t

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H g, P t

and graphite

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N a

and

S

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N a, H g

and

S

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Solution

The correct option is B $H g, P t$ and graphite
sodium and sulphur reacts with water whereas $H g, P t$ and graphite donot,hence can be used as electodes.

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