First slide

Hydrogen Peroxide

Question

For the decolorisation of one mole of KMnO₄ in acidic medium the number of moles of H₂O₂ required is

Moderate

A

1/2
B

3/2
C

5/2
D

7/2

Solution

$\mathop {2KMn{O_4}}\limits^{ + 7} + 5{H_2}{O_2} + 3{H_2}S{O_4}\xrightarrow{{}}{K_2}S{O_4} + 2\mathop {Mn}\limits^{ + 2} S{O_4} + 8{H_2}O + 5{O_2}\$
From balanced equation:
KMnO₄ H₂O₂
2 moles → 5 moles
1 mole → ? moles
$\large \frac{1 \times 5}{2} = 2.5 moles$
⇒ i.e., 2 moles of KMnO₄ decolonised (or) reduced by 5-moles of H₂O₂
where as 1 mole of KMnO₄ is decolonised by ___moles of H₂O₂

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