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JEE Main20241 Feb 2024Morning ShiftChemistryRedox ReactionsActual

Which of the following reactions are disproportionation reactions? 1 Cu + → Cu 2 + + Cu 2 3 MnO 4 2 - + 4 H + → 2 MnO 4 - + MnO 2 + 2 H 2 O 3 2 KMnO 4 → K 2 MnO 4 + MnO 2 + O 2 4 2 MnO 4 - + 3 Mn 2 + + 2 H 2 O → 5 MnO 2 + 4 H + Choose the correct answer from the options given below:

Options

  1. A1 , 2
  2. B2 , 3 , 4
  3. C1 , 2 , 4
  4. D1 , 4

Correct answer

A. 1 , 2

Step-by-step solution

In disproportionation reaction, both oxidation and reduction of same chemical species occurs. Oxidation is gain in oxidation number. Reduction is loss in oxidation number. 1 ) Cu + ⟶ Cu 2 + + Cu Oxidation state of Cu + = + 1 . Oxidation state of Cu 2 + = + 2 . Oxidation state of Cu = 0 . Here, Cu + is getting both reduced and oxidised. 2 ) 3 MnO 4 - + 4 H + ⟶ 2 MnO 4 - + MnO 2 + 2 H 2 O Oxidation state of Mn in MnO 4 - = + 7 . Oxidation state of Mn in MnO 2 = + 4 . Here, reduction is taking place. 3 ) 2 KMnO 4 ⟶ K

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