Solid StateHard

Question

What type of crystal defect is indicated in the diagram below ?
Na+    Cl-    Na+    Cl-    Na+    Cl-
Cl-      -       Cl-       Na+    -       Na+
Na+    Cl-    -          Cl-    Na+    Cl-
Cl-      Na+  Cl-      Na+   -         Na+

Options

A.Frenkel defect
B.Schottky defect
C.Interstitial defect
D.Frenkel and Schottky defect

Solution

Equal no. of Na+ & Cl- are missing completely,
⇒  Schottky defect.

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