Fill in the blanks. 

(a) Most liquids that conduct electricity are solutions of [[1]] , [[2]] and [[3]]. 

(b) The passage of an electric current through a solution causes [[4]] effects. 

(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the [[5]] terminal of the battery. 

(d) The process of depositing a layer of any desired metal on another material by means of electricity is called [[6]].