Some Basic Concepts Of Chemistry Question 86
Question: When 2.5 g of a. sample of Mohr’s salt reacts N completely with 50 mL of $ \frac{N}{10}KMnO _4 $ solution. The % purity of the sample of Mohr’s salt is:
Options:
A) 78.4
B) 70
C) 37
D) 40
Show Answer
Answer:
Correct Answer: A
Solution:
[a] m-eq. $ FeSO _4{{(NH _4)}_4}SO _4.6H _2O $ $ =m-eq.of,KMnO _4 $ (n=l) $ \frac{W}{392}\times 1\times 1000=0.1\times 50 $ Hence, % purity of Mohr’s salt $ =\frac{1.96}{2.5}\times 100=78.4% $
$ W=1.96g $
