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Complete and balance t-he following reactions

(i) Mn2+ + PbO2 → MnO-4 + H2O

(ii) Ag+ + AsH3 → H3AsO3 + H+

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(i) 2Mn2+ + 5PbO2 + 4H+  2MnO-4 + 2H2O + 5Pb2+

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