Assertion (A) $\mathrm{E}_{\text {cell }}$ should have a positive value for the cell to function.

Reason (R) $\mathrm{E}_{\text {cathode }}<\mathrm{E}_{\text {anode }}$

Assertion (A) Conductivity of all electrolytes decreases on dilution.

Reason (R) On dilution number of ions per unit volume decreases.

Assertion (A) $\Lambda_m$ for weak electrolytes shows a sharp increase when the electrolytic solution is diluted.

Reason (R) For weak electrolytes degree of dissociation increases with dilution of solution.

Assertion (A) Mercury cell does not give steady potential.

Reason (R) In the cell reaction, ions are not involved in solution.

Assertion (A) Electrolysis of NaCl solution gives chlorine at anode instead of $\mathrm{O}_2$.

Reason $(R)$ Formation of oxygen at anode requires over voltage.