The crystal with metal deficiency defect is :

N a C l

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F e O

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K C l

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Z n O

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Solution

The correct option is B $F e O$
The defect that arises due to the missing of a cation from its lattice site and presence of the cation with higher charge in the adjacent site is called metal deficiency defect. Hence, the metals showing variable valency like transition metal show this defect, e.g., $F e O$

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Match the types of defect given in Column I with the statement given in Column II.

$\begin{matrix} C o l u m n I & C o l u m n I I A . I m p u r i t y d e f e c t & 1. N a C l w i t h a n i o n i c s i t e s c a l l e d F - c e n t r e s B . M e t a l e x c e s s d e f e c t & 2. F e O w i t h F e^{3 +} C . M e t a l d e f i c i e n c y d e f e c t & 3. N a C l w i t h S r^{2 +} a n d s o m e c a t i o n i c s i t e s v a c a n t \end{matrix}$