Surface Chemistry & Solid State · JEE Main previous year questions

2004 1 question

1. Q2202004 · 24 Apr 2004 · Shift 1

   What type of crystal defect is indicated in the diagram below? $$\begin{array}{llllll}\mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}\\ \mathrm{C}{\mathrm{l}}^{-}& \square & \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \square & \mathrm{N}{\mathrm{a}}^{+}\\ \mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}& \square & \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}\\ \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \mathrm{C}{\mathrm{l}}^{-}& \mathrm{N}{\mathrm{a}}^{+}& \square & \mathrm{N}{\mathrm{a}}^{+}\end{array}$$

   1. A.Interstitial defect
   2. B.Schottky defect
   3. C.Frenkel defect
   4. D.Frenkel and Schottky defects
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   Answer: B