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

Among `Na, Hg, S, Pt` and graphite, which can be used as electrodes in electrolystic cells having aqueous solutions?

A

Na and S

B

Pt and graphite only

C

Na , Hg and S

D

Hg, Pt and graphite

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The correct Answer is:
D
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