Name two metals which are purified by using the chemical effect of current (or electrolysis).
Name two metals which are produced (or extracted) by using the chemical effect of electric current.
(a) What is meant by the chemical effect of electric current ? Explain with the help of an example. (b) Name any two applications of the chemical effect of electric current. (c) What is electrolysis ? Explain why, in the electrolysis of water, 'acidified water' is used.