Which of the following reactions is correct?

2 KMnO4 + 3 H2SO4 + 5 H2O → K2SO4 + 2 MnSO4 + 8 H2O + SO2
2 KMnO4 + 3 H2SO4 + 5 H2O → K2SO4 + 2 MnSO4 + 8 H2O + O2
2 KMnO4 + 3 H2SO4 + 5 H2O → K2SO4 + 2 MnSO4 + 8 H2O + H2
2 KMnO4 + 3 H2SO4 + 5 H2O → K2SO4 + 2 MnSO4 + 8 H2O + CO2

Correct answer: 2 KMnO4 + 3 H2SO4 + 5 H2O → K2SO4 + 2 MnSO4 + 8 H2O + O2

Solution

In acidic medium, KMnO4 acts as a strong oxidizing agent and releases oxygen gas (O2) as a product. The reaction in option B is balanced and correct.

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