(a)(i) Draw and label a simple cell for the electrolytic purification of copper.

(ii) Write can equation for the reaction at each electrode in (a)(i) above.

(iii) State with reason whether the Daniell cell is an electrolytic cell or an electrochemical cell.

(iv) What is the function of MnO\(_2\) in the Laclanche cell?

 

(b) Consider the following equation: MnO\(^-_4\) + 8H\(^+\) + xe\(^-\) \(\to\) Mn\(^{2+}\) + yH\(_2\)O. State the

(i) values of x and y;

(ii) oxidation state of Mn in MnO\(^-_4\).

 

(c)(i) List three factors that affect selective discharge of ions during electrolysis

(ii) State Faraday's second law of electrolysis.

(iii) A voltameter containing silver trioxonitrate(V) solution was connected in series to another voltameter containing copper (II) tetraoxosulphate(VI) solution. When a current ri 0.200 ampere was passed through the solutions, 0.780g of silver was deposited. Calculate the

I. mass of copper that would be deposited in the copper voltameter

II. quantity of electricity used and the time of current flow. [Cu = 63.5 ; Ag = 108; 1F = 96500C]