Question

The non-stoichiometric compound \( \mathrm{Fe}_{0.94}\mathrm{O} \) is formed when \( x\% \) of \( \mathrm{Fe}^{2+} \) ions are replaced by as many \( \dfrac{2}{3} \mathrm{Fe}^{3+} \) ions.
The value of \( x \) is:

• A. 18
• B. 12
• C. 15
• D. 6

Hint:

Non-stoichiometry in metal oxides arises due to variable oxidation states.

Answer 1

The Correct Option is D

Step 1: Deficiency of iron is 1-0.94=0.06.
Step 2: Hence 6% of Fe²+ ions are replaced by Fe³+ ions.