Some Basic Concepts Of Chemistry Question 280
Question: 3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of $ KMnO _4 $ during titration for complete oxidation. The weight of $ KMnO _4 $ present in one litre of the solution is [Tamilnadu CET 2002]
Options:
A) 3.476 g
B) 12.38 g
C) 34.76 g
D) 1.238 g
Show Answer
Answer:
Correct Answer: A
Solution:
$ KMnO _4 $ = Mohr salt $ \frac{M _1V _1}{1}=\frac{M _2V _2}{5}=[ \frac{W}{M\times V}\times 1000 ]\times \frac{V _2}{5} $ $ [ \frac{W\times 1000}{58\times 1000} ]\times 18 $ $ =\frac{3.92\times 1000}{392\times 1000}\times \frac{20}{5} $ W=3.476gm/L.
