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Question

Among Na,Hg,S,Pt and graphite, which can be used as electrodes in electrolytic cells having aqueous solutions?
  1. Hg and Pt
  2. Hg,Pt and graphite
  3. Na and S
  4. Na,Hg and S

A
Hg,Pt and graphite
B
Na and S
C
Hg and Pt
D
Na,Hg and S
Solution
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sodium and sulphur reacts with water whereas Hg,Pt and graphite donot,hence can be used as electodes.

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