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Among Na,Hg ,S,Pt and graphite which can...

Among Na,Hg ,S,Pt and graphite which can be used as electrodes in electrolytic cells having aqueous solutions:

A

`Na` and `S`

B

`Hg` and `Pt`

C

`Na, Hg and S`

D

`Hg,Pt and graphite

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The correct Answer is:
D
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