Q. In the reaction: 2KMnO₄ + 5H₂C₂O₄ + 3H₂SO₄ → K₂SO₄ + 2MnSO₄ + 10CO₂ + 8H₂O, the oxidation number of manganese changes from:

प्रतिक्रिया में: 2KMnO₄ + 5H₂C₂O₄ + 3H₂SO₄ → K₂SO₄ + 2MnSO₄ + 10CO₂ + 8H₂O, मैंगनीज की ऑक्सीकरण संख्या बदल जाती है:

A
+7 to +4
+7 से +4
B
+7 to +2
+7 से +2
C
+6 to +2
+6 से +2
D
+4 to +2
+4 से +2

Explanation

In the reaction: 2KMnO₄ + 5H₂C₂O₄ + 3H₂SO₄ → K₂SO₄ + 2MnSO₄ + 10CO₂ + 8H₂O

Manganese oxidation states:

  • In KMnO₄: Mn has oxidation number +7 (since K is +1, O is -2, so Mn = +7)
  • In MnSO₄: Mn has oxidation number +2 (since SO₄ is -2, so Mn = +2)

Change: +7 to +2 (reduction by 5 electrons)

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