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25 g of a sample of FeSO(4) was dissolve...

25 g of a sample of `FeSO_(4)` was dissolved in water containing `dil. H_(2)SO_(4)` and the volume made upto 1 litre. 25 mL of this solution required 20mL of `N/ 10 KMnO_(4)` for complete oxidation. Calculate % of `FeSO_(4).7H_(2)O` in given sample.

A

0.78

B

0.98

C

0.89

D

0.79

Text Solution

Verified by Experts

The correct Answer is:
C
Mili eq. of `FeSO_4. 7H_2O` in 25 ml =Mili eq. of `KMnO_4` used =2 Milli eq.
Mili eq. of `FeSO_4. 7H_2O` in 1000 ml =80 Mili eq.
mass of `FeSO_4. 7H_2O` in solution =`80/1xx278xx1/1000=22.24` gm
% of `FeSO_4 . 7H_2O=22.24/25xx100=88.96=89%`
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