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Question
Which of the following reactions are disproportionation reactions?
(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]
(b) \[\ce{3MnO^{-}4 + 4H^{+} -> 2MnO^{-}4 + MnO2 + 2H2O}\]
(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]
(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]
Options
a, b
a, b, c
b, c, d
a, d
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Solution
a, b
Explanation:
(a) \[\ce{\overset{+1}{Cu+} -> \overset{+2}{Cu^{2+}} + \overset{0}{Cu}}\]
(b) \[\ce{\overset{+6}{3MnO^{-}4} + 4H^{+} -> \overset{+2}{2MnO^{-}4} + \overset{+4}{MnO2} + 2H2O}\]
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