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The diagram below represents a set up that can be used to electrolyze aqueous copper (II) sulphate.
(a) (i) Describe how oxygen gas is produced during the electrolysis.
(ii) explain why copper electrodes are not suitable for this electrolysis
(b) Impure copper is purified by an electrolytic process.
(i) Name one ore from which copper is obtained
(ii) Write the equation for the reaction that occur at the cathode during the purification.
(iii) In an experiment to electroplate a copper spoon with silver, a current of 0.5 A was passed for 18 minutes.
Calculate the amount of silver deposited on the spoon. (IF=96500 coulombs, Ag=108)
(iv) Give two reasons why some metals are electroplated.