1.

25.0 g of FeSO_4. 7H_2O was dissolved in water containing dilute H_2SO_4, and the volume was made up to 1.0 L.25.0 mL of this solution required 20 mL of an N//10KMnO_4 solution for complete oxidation.The percentage of FeSO_4. 7H_2O in the acidic solution is

Answer»

0.78
0.98
0.89
0.79

Solution :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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