Q.

Statement I : Frenkel defect and Schottky defect are shown by non–ionic solids
Statement II : Interstitial defect in non–ionic solids leads to increase in density of the crystal.

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a

Both statements I and II are incorrect  

b

Both statements I and II are correct

c

Statement - I is incorrect and statement - II is correct

d

Statement - I is correct and statement - II is incorrect 

answer is C.

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Detailed Solution

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I) Frenkel defect & Schottky defect are shown by ionic solids

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II) Metal atoms occupy lattice points and also occupy same interstitial sites.
  density increases.

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Statement I : Frenkel defect and Schottky defect are shown by non–ionic solidsStatement II : Interstitial defect in non–ionic solids leads to increase in density of the crystal.