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Question:

Which of the following reaction are disproportionation reactions?

(a) and (b) only

(a), (c ) and (d)

(a) and (d) only

(a), (b) and (c )

Solution:

Correct option is A. (a) and (b) only
a) 2Cu+1 → Cu2+ + Cu0
Disproportionation
b) 3MnO42− + 4H+ → 2MnO4− + MnO2 + 2H2O
Disproportionation
c) 2KMnO4 → Δ K2MnO4 + MnO2 + O2
Not a Disproportionation
d) 2MnO4− + 3Mn2+ + 2H2O → 5MnO2 + 4H+
Not a Disproportionation