Question 14 Marks
(a) Out of the following pairs, predict with reason which pair will allow greater conduction electricity:
(i) Silver wire at $30^{\circ}C$ or silver wire at $60^{\circ}C.$
(ii) 0.1 M $CH_{3}COOH$ solution or 1 M $CH_{3}COOH$ solution.
(iii) KCl solution at $20^{\circ}C$ or KCl solution at $50^{\circ}C$.
(b) Give two points of differences between electrochemical and electrolytic cells.
(i) Silver wire at $30^{\circ}C$ or silver wire at $60^{\circ}C.$
(ii) 0.1 M $CH_{3}COOH$ solution or 1 M $CH_{3}COOH$ solution.
(iii) KCl solution at $20^{\circ}C$ or KCl solution at $50^{\circ}C$.
(b) Give two points of differences between electrochemical and electrolytic cells.
Answer
View full question & answer→(a) (i) Silver wire at $30^{\circ} C$ because as temperature increases, resistance increases so conduction increases.
(ii) $0.1 M CH _3 COOH$, because on dilution degree of ionization increases hence conduction increases.
(iii) KCl solution at $50^{\circ} C$ because at high temperature mobility of ions increases hence conduction increases.
(ii) $0.1 M CH _3 COOH$, because on dilution degree of ionization increases hence conduction increases.
(iii) KCl solution at $50^{\circ} C$ because at high temperature mobility of ions increases hence conduction increases.
| (b) Electrochemical Cell | Electrolytic Cell |
| (1) Anode : - Ve Cathode : + Ve | Anode : + Ve Cathode : - Ve |
| (2) It converts chemical energy into electrical energy | It converts electrical energy into chemical energy. |