Question
Analysis shows that FeO has a non-stoichiometric composition with formula $ Fe_{0.95}O $. Give reason.
✓
Answer
It shows metal deficiency defect. In the crystals of FeO, some of $ Fe^{2+} $ cations are replaced by $ Fe^{3+} $ ions. Eventually there would be less amount of metal as compared to stoichiometric composition.
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