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09/12/2021 10:54 am
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3.4 g sample of H2O2 solution containing x% H2O2 by weight requires x mL of KMnO4 solution for complete oxidation under acidic condition. The normality of KMnO4 solution is
(a) 1 N
(b) 2 N
(c) 3 N
(d) 0.5 N
1 Answer
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09/12/2021 11:00 am
Correct answer: (b) 2 N
Explanation:
100 g of H2O2 sample solution contains = x g of H2O2
3.4 g of H2O2 sample solution contains = \(\frac{x}{100}\times 3.4\)
Weight of H2O2 = \(\frac{3.4x}{100}\)
Eq. of H2O2 = \(\frac{3.4x}{100}\)x \(\frac{1}{17}\)
mEq of H2O2
= \(\frac{3.4x}{100 \times 17} \times 1000\) = \(\frac{34x}{17}\) = 2x
mEq of KMnO4 = \(x \times N\)
\(x \times N\) = 2x
N = 2