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Which of the following reactions are disproportionation reactions?

(a) Cu+ → Cu2+ + Cu

(b) 3MnO4 + 4H+ → 2MnO4 + MnO2 + 2H2O

(c) 2KMnO4 → K2MnO4 + MnO2 + O2

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

(i) a, b

(ii) a, b, c

(iii) b, c, d

(iv) a, d

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(i) a, b are disproportionation reactions.

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