Select the correct answer from the list in brackets:

(i) An aqueous electrolyte consists of the ions mentioned in the list. The ion which could be discharged most readily during electrolysis. [Fe²⁺, Cu²⁺, H⁺].

(ii) The metallic electrode which does not take part in an electrolytic reaction. [Cu, Ag, Pt, Ni].

(iii) The ion which is discharged at the anode during the electrolysis of copper sulphate solution using copper electrodes as anode and cathode. [Cu²⁺, OH^1-, SO₄^2-, H⁺].

(iv) When dilute sodium chloride is electrolysed using graphite electrodes, the cation which is discharged at the cathode most readily. [Na¹⁺, OH^1-, H¹⁺, Cl^1-].

(v) During silver plating of an article using potassium argentocyanide as an electrolyte, the anode material should be [Cu, Ag, Pt, Fe].

State one appropriate observation for : Electricity is passed through molten lead bromide.

Copper sulphate soln. is electrolysed using copper electrodes as seen in diagram.

(i) Which electrode to your left or right is known as the oxidising electrode and why?

(ii) Write the equation representing the reaction that oc­curs.

(iii) State two appropriate observations for the above elec­trolysis reaction.

Name: A gas which in the liquid state does not conduct electricity but conducts when dissolved in water.