JAMB - Chemistry (2009 - No. 22)
Which of the following metals is purified commercially by electrolysis?
Zn
Fe
Sn
Cu
Selitys
Electrolysis is used extensively in metallurgical processes, such as in extraction (electrowinning) or purification (electrorefining) of metals from ores or compounds and in deposition of metals from solution (electroplating).
Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate.