State which of these will act as a non-electrolyte ?

1. Liquid carbon tetrachloride
2. Acetic acid
3. Sodium hydroxide aqueous solution acid.
4. Potassium chloride aqueous solution.

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.

The observation seen when fused lead bromide is electrolysed is:

1. a silver grey deposit at anode and a reddish brown deposit at cathode.
2. a silver grey deposit at cathode and a reddish brown deposit at anode.
3. a silver grey deposit at cathode and reddish brown fumes at anode.
4. silver grey fumes at anode and reddish brown fumes at cathode.

During electroplating an article with silver, the electrolyte used is:

1. silver nitrate solution
2. silver cyanide solution
3. sodium argentocyanide solution
4. nickel sulphate solution