Q.

The true statement about mercury cell is

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it is used in high current devices

here Zn - Hg acts as cathode and a paste of C + HgO as anode

the cell potential remains constant clue to non-involvement of such a ion, concentration of which can change during its whole life

All of the above

answer is C.

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Detailed Solution

Mercury cell is a low current device. ln it Zn - Hg acts as anode and a paste of C + HgO as cathode. The cell potential remains the same due to the non-involvement of such a ion, concentration of which can change during its whole life.

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