Question

Mark the incorrect pair from the following.

• A. Schottky defect – Equal number of cations and anions are missing
• B. Frenkel defect – Dislocations of cation from its normal site to an interstitial site.
• C. Impurity defect - $CdCl_{2}$in AgCl crystal to create cationic vacancy.
• D. Metal excess defect- $Fe_{0.93}O$

Answer 1

Answer: (D)

Metal excess defect- $Fe_{0.93}O$

Answer 2

$Fe_{0.93}O$is metal deficiency defect. In FeO, some $Fe^{2 +}$ions are missing and the loss of positive charge is

made up by $Fe^{3 +}$ions.