NEET Chemistry Redox Reactions Questions Solved


25.0 g of FeSO4.7H2O was dissolved in water containing dilute H2SO4, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H2O in the acid solution is

(1) 78%

(2) 98%

(3) 89%

(4) 79%

(3) M.e. of FeSO4 ⋅ 7H2O in 25 ml = m.e. of KMnO4 used = 2 m.e.

M.e. of FeSO4 ⋅ 7H2O in 1000 ml = 80 m.e.

mass of FeSO4 ⋅ 7H2O in solution = 801×2787×11000=22.24 gm

% of FeSO4 ⋅ 7H2O = 22.2425 × 100 = 88.96 89%

Difficulty Level:

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