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Redox Reactions
Types of Redox Reactions – Disproportionation
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- years asked, 2017–2026
- 1 of 10
- of Redox Reactions
- 3.33%
Concepts tested
- disproportionation reactions
All Questions
2019 1 question
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Which of the following reactions are disproportionation reaction? (a) $2Cu^+\rightarrow Cu^{2+}+Cu^0$ (b) $3MnO_4^{2-}+4H^+\rightarrow2MnO_4^-+MnO_2+2H_2O$ (c) $2KMnO_4\xrightarrow{\Delta}K_2MnO_4+MnO_2+O_2$ (d) $2MnO_4^-+3Mn^{2+}+2H_2O\rightarrow5MnO_2+4H^+$ Select the correct option from the following:(a) $2Cu^+\rightarrow Cu^{2+}+Cu^0$: Cu goes from +1 to +2 and 0 → disproportionation (b) $3MnO_4^{2-}+4H^+\rightarrow2MnO_4^-+MnO_2+2H_2O$: Mn goes from +6 to +7 and +4 → disproportionation (c) $2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2$: Mn is reduced (+7 → +6, +4) while O is oxidised → not disproportionation (d) $2MnO_4^-+3Mn^{2+}+2H_2O\rightarrow5MnO_2+4H^+$: Mn from +7 and +2 goes to +4 → comproportionation, not disproportionation So only (a) and (b) are disproportionation reactions.