Multiple choice

Which of the following will have deficiency defect?

  1. NaCI

  2. FeO

  3. KCI

  4. ZnO

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

FeO (Ferrous oxide) is a classic example of a metal-deficient defect, where the ratio of iron to oxygen is less than 1:1 due to the presence of Fe(3+) ions replacing some Fe(2+) ions to maintain electrical neutrality.