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Q.

What is anode and cathode used in the commonly used mercury cell ?
 

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a

Anode - Zn
Cathode - HgO

b

Anode -  Zn(Hg) amalgam
Cathode - HgO and carbon

c

Anode - Zn
Cathode - HgO and carbon

d

Anode - Zn(Hg)
Cathode - HgO

answer is D.

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Detailed Solution

Zinc-mercury amalgam acts as anode and a paste of HgO and carbon as cathode in the mercury cell. The electrolyte is the paste of KOH and ZnO.

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