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Some Basic Concepts of Chemistry
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12/08/2021 12:31 pm
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3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 mL of water. 20 mL of this solution requires 18 mL of potassium permanganate during titration for complete oxidation. The weight of KMnO4 present in one litre of the solution of
(a) 3.47 g
(b) 12.38 g
(c) 1.23 g
(d) 34.76 g
1 Answer
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12/08/2021 12:32 pm
Correct answer: (a) 3.47 g
Explanation:
Normality of ferrous ammonium sulphate
= \(\frac{3.92 \times 1000}{392 \times 100}\) = 0.1
(Eq. wt of FAS is 392)
\(N_1V_1\) = \(N_2V_2\)
20 x 0.1 = 18 x N2
N2 = 0.111
1 g ev. of KMnO4 = 31.6g
0.111 g ev. of KMnO4 = 31.6 × 0.111
= 3.5 g.