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Complete and balance the following react...

Complete and balance the following reactions:
(i). `Mn^(2+)+PbO_2toMnO_4^(ɵ)+H_2O`
(ii). `Ag^(o+)+AsH_3toH_3AsO_3+H^(o+)`

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(i). `2Mn^(2+)+5PbO_2+4H^(o+)to2MnO_4^(ɵ)+5Pb^(2+)+2H_2O`
(ii). `6Ag^(o+)+AsH_3+3H_2Oto6Agdarr+6H^(o+)+H_3AsO_3`
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