AP EAMCET · Chemistry · Solid State
Which of the following molecular formula and type of defect are correct for the following statement?
"In \(\mathrm{FeO}\) crystal, some \(\mathrm{Fe}^{2+}\) ions are missing and the loss of positive charge is made up by the presence of \(\mathrm{Fe}^{3+}\) ions".
- A \(\mathrm{Fe}_{0.95} \mathrm{O}\) and metal excess defect.
- B \(\mathrm{Fe}_{1.05} \mathrm{O}\) and metal deficiency defect.
- C \(\mathrm{Fe}_{0.95} \mathrm{O}\) and metal deficiency defect.
- D \(\mathrm{Fe}_{1.05} \mathrm{O}\) and metal excess defect.
Answer & Solution
Correct Answer
(C) \(\mathrm{Fe}_{0.95} \mathrm{O}\) and metal deficiency defect.
Step-by-step Solution
Detailed explanation
The crystal of FeO shows metal deficiency defect because some \(\mathrm{Fe}^{2+}\) ions go missing from their position in lattice and the loss of positive charge is made up by the presence of required number of \(\mathrm{Fe}^{3+}\) ions. Usually around \(15 \% \mathrm{Fe}^{2+}\)…
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