Question

Which of the following will have deficiency defect?

• A. NaCl
• B. FeO
• C. KCl
• D. ZnO

Answer 1

Answer: (B)

FeO

Answer 2

FeO is mostly found with a composition of $Fe_{0.95}O.$ (Ranges from $Fe_{0.93}O - Fe_{0.96}O$). In

crystals of FeO, some $Fe^{2 +}$cations are missing and the loss of positive charge is made up by the presence of the required number of $Fe^{3 +}$ions.