Solve this question ....please

48. In a process of electrolysis, MnO 4 -  is converted into MnO 2 - . By 1 faraday, one mole of MnO 4 -  will give:-
(1) 1 mol of MnO2
(2) 0.5 mol of MnO2
(3) 0.66 mol of MnO2
(4) 0.33 mole of MnO2

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