7(c)
An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes.
Observe the diagram and answer the questions that follow:
![An aqueous solution of nickle [II] sulphate was electrolyzed using nickle electrodes. What do you observe at the cathode and anode respectively. Name the cation that remains as a spectator ion in the solution. Which equation for the reaction at the anode is correct. Electrolysis, Simplified Chemistry Dalal Solutions ICSE Class 10.](/assets/img/9a1460074cea177a8e.jpg)
(i) What do you observe at the cathode and anode respectively?
(ii) Name the cation that remains as a spectator ion in the solution.
(iii) Which equation for the reaction at the anode is correct?
- (a)Ni ⟶ Ni2+ + 2e-+
- (b)Ni + 2e- ⟶ Ni2+
- (c)Ni2+ ⟶ Ni + 2e-
- (d)Ni2+ + 2e- ⟶ Ni
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(i) The observations at cathode and anode are:
At cathode: Ni2+ ions move towards cathode and are discharged as neutral Ni atoms by gain of electrons. Thus, Ni is deposited at cathode.
At anode: Diminishes in mass. Ni2+ ions are formed.
(ii) H+ ions.
(iii) Ni ⟶ Ni2+ + 2e-