Question

Q -Which of the following will have metal deficiency defect?
(A)NaCl
(B)FeO
(C)KCl
(D)ZnO

Answer 1

Answer:

Step-by-step explanation:

In metal deficiency defect, a cation is missing from its lattice site. To maintain electrical neutrality, one of the nearest metal ions acquires an extra positive charge. This type of defect occurs in compounds where the metal can exhibit variable valency. e.g., Transition metal compounds.

In the given options, an only metal which exhibits variable valency is Fe.  

So, FeO is the correct answer.

Hence, option "B" is the correct answer.

Answer 2

Given,

Which of the following will have metal deficiency defects?

(A)NaCl

(B)FeO

(C)KCl

(D)ZnO

To find,

The correct option in the given question.

Solution,

Know that the defects which arise due to the presence of extra cations at interstitial sites or due to the absence of anions are called metal excess defects. These are of two types:-

1. Due to anionic vacancies
2. Due to the presence of extra cation

In the given question FeO is the only option that shall have a metal deficiency defect.

Hence, the correct option is (B) i.e.FeO.