Question

Composition of a sample is Fe0.93O1.00 . If Fe is present in +2 & +3 oxidation state in this sample then % of Fe present in +3 oxidation state

• A. 85%
• B. 30%
• C. 15%
• D. 60%

Answer 1

Answer: (C)

15%

Answer 2

(3)

Fe0.93 O1.00

From charge balance

Where X is mole of Fe(III)

3x + (0.93 – x) 2 = 2

3x + 1.86 – 2x = 2

x = 0.14

% of Fe3+ $= \frac{0.14}{0.93}$ ´ 100 = 15%