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Question: For decolourization of 1 mole of\(KMnO_{4}\), the moles of \(H_{2}O_{2}\) required is....

For decolourization of 1 mole ofKMnO4KMnO_{4}, the moles of H2O2H_{2}O_{2} required is.

A

1/2

B

3/2

C

5/2

D

7/2

Answer

5/2

Explanation

Solution

2KMnO4+3H2SO4→K2SO4+2MnSO42KMnO_{4} + 3H_{2}SO_{4}\overset{\quad\quad}{\rightarrow}K_{2}SO_{4} + 2MnSO_{4}

+3H2O+5O+ 3H_{2}O + 5O

5H2O2+5O→5H2O+5O25H_{2}O_{2} + 5O\overset{\quad\quad}{\rightarrow}5H_{2}O + 5O_{2}

2KMnO4+3H2SO4+5H2O2→K2SO4+2MnSO42KMnO_{4} + 3H_{2}SO_{4} + 5H_{2}O_{2}\overset{\quad\quad}{\rightarrow}K_{2}SO_{4} + 2MnSO_{4}

+8H2O+5O2+ 8H_{2}O + 5O_{2}