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  4. Complete and balance the following reactions. (i) Mn2-+PbO2 arrow MnO4- + H2O (ii) Ag+ +AsH3 arrow H3AsO3 + H+

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Q. Complete and balance the following reactions.
(i) $Mn^{2-}+PbO_2 \rightarrow \, MnO_4^- + H_2O$
(ii) $Ag^+ +AsH_3 \rightarrow H_3AsO_3 + H^+$

IIT JEEIIT JEE 1987The d-and f-Block Elements

Solution:

(i) $2Mn^{2+}+5PbO_2 +4H^+ \rightarrow \, \, 2MnO_4^- +2H_2O+5Pb^{2+}$
(ii) $6Ag^+ +AsH_3 +3H_2 O \rightarrow \, \, 6Ag +H_3AsO_3 +6H^+$