First slide

Compounds of hydrogen

Question

x g of H₂O₂requires 100 mL of M/5 KMnO₄ in a titration in a solution having pOH = 1.0
Which of the following is/are correct?

Moderate

A

The value of x is 1.7 g.
B

The value of x is 0.34 g.
C

${MnO}_{4}^{⊝} changes to {MnO}_{4}^{2 -} .$
D

$H_{2} O_{2} changes to O_{2} .$

Solution

pOH = 1, strong basic medium
$\Rightarrow {MnO}_{4}^{⊖} ⟶ {MnO}_{4}^{2 -} (n -factor = 1)$
$2 OH + H_{2} O_{2} ⟶ O_{2} + 2 H_{2} O + 2 e^{⊖}$
$mEq of H_{2} O_{2} = mEq of {MnO}_{4}^{⊝}$
$\frac{x}{34 / 2} \times 1000 = 100 \times [\frac{1}{5} \times 1]$
x = 0.34g

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