Transition and InnerTransition Elements - Result Question 70
70. Complete and balance the following reactions.
(i) $\mathrm{Mn}^{2+}+\mathrm{PbO}_2 \longrightarrow \mathrm{MnO}_4^{-}+\mathrm{H}_2 \mathrm{O}$
(ii) $\mathrm{Ag}^{+}+\mathrm{AsH}_3 \longrightarrow \mathrm{H}_3 \mathrm{AsO}_3+\mathrm{H}^{+}$
(1987, 2M
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Solution:
(i) $2 \mathrm{Mn}^{2+}+5 \mathrm{PbO}_2+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+2 \mathrm{H}_2 \mathrm{O}+5 \mathrm{~Pb}^{2+}$
(ii) $6 \mathrm{Ag}^{+}+\mathrm{AsH}_3+3 \mathrm{H}_2 \mathrm{O} \longrightarrow 6 \mathrm{Ag}+\mathrm{H}_3 \mathrm{AsO}_3+6 \mathrm{H}^{+}$
BETA
