Which of the following hot aqueous solutions is used to dip carbon rods of $H_2 - O_2$ fuel cell?

Identify the function of a salt bridge in an electrochemical cell.

If the salt bridge between two half-cells is removed,the voltage of the cell:

The electrolyte used in a mercury cell is:

The calomel electrode used as a reference electrode contains which of the following substances?

$A$ moving coil galvanometer has $150$ equal divisions. Its current sensitivity is $10 \text{ divisions per milliampere}$ and voltage sensitivity is $2 \text{ divisions per millivolt}$. In order that each division reads $1 \text{ V}$,the resistance in ohms needed to be connected in series with the coil will be