This was one of the popular questions. The candidates could not state the application of electrolysis in a school laboratory but could state those in industries. This is an indication of lack of laboratory practices.
The expected answers are:
(a) In industry we use electrolysis for;
(ii) extraction of some metals (e.g. aluminum);
- production of some gases (e.g. hydrogen);
- purification of some metals (eg. copper).
(b) In the school laboratory, we use electrolysis to:
- calibrate ammeter;
- electrolyze acidified water.