Write the working of mercury dry cell

Mention the reaction occurring at (i) anode, (ii) cathode, during working of a mercury cell. Why does the voltage of a mercury cell remain constant during the operation?

During the working of a galvanic cell and with the passage of time.

What do you understand by a Galvanic cell ? Explain the working of one such cell in detail.

Draw a labelled circuit diagram of a potentiometer to compare emfs of two cells. Write the working formula (Derivation not required).

Write the equation taking place at the anode in mercury cell

Describe the composition of anode and cathode in a mercury cell. Write the electrode reaction for this cell.

Name the principal ore of mercury and write its formula.

Assertion:In mercury cell, the cell potential is approximately 1.35 V Which cell will measure standard electrode and remains constant during its life. Reason : The overall reaction in mercury cell is represented as Zn(Hg)+HgO_((s)) to ZnO_((s)) + Hg_((l))