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Question

Which of the following reactions are disproportionation reactions?
a) 2Cu+ Cu2+ + Cu0

b) 3MnO24 + 4H+ 2MnO4 +MnO2 + 2H2O

c) 2KMnO4 K2MnO4 + MnO2 + O2

d) 2MnO4 + 3Mn2+ + 2H2O 5MnO2 + 4H+

A
(a) and (b) only
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B
(a), (b) and (c)
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C
(a), (c) and (d)
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D
(a) and (d) only
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Solution

The correct option is A (a) and (b) only
Disproportionation reactions are those in which the same reactant species is oxidised and reduced, this happens in a) and b) since the oxidation number of:
Copper changes from +1 to +2 and 0 in a)
Manganese changes from +6 to +7 and +4 in b)
In c), Mn goes from + 7 to +6 and +4, this is reduction only.
In d), Mn has two oxidation states - +7 and +2 which become +4. This is the reverse of disproportionation.

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