In the experiment on plating an iron key with copper, what changes will you observe in the mass of the electrodes (the key and the copper plate) before and after the experiment? Will there be a change in the mass of the electrolyte? Draw the circuit diagram of the setup used to electroplate an iron spoon with copper.

A liquid that conducts electricity due to the presence of ions is called a/an _____ .

Which of the following are electrolytes?

(i) impure water

(ii) kerosene

(iii) salt solution

(iv) copper

Which of the following are non-electrolytes?

(i) lemon juice

(ii) distilled water 

(iii) kerosene

(iv) copper sulphate solution

Which of these are applications of electrolysis?