Questions

Statement-I : Density of an ionic solid decreases due to Frenkel defect.
Statement-II: Packing efficiency of simple cubic structure is 52.4%.

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Both statements I and II are correct

Statement-I is correct and statement-II is incorrect

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

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detailed solution

Correct option is C

I) Frenkel defect is a dislocation defect. One of the ion(generally cation) leaves the lattice point and occupies the interstitial site but does not leave the crystal, thus no change in the density of crystal.Schottky defect is a vacancy defect in which equal number of cations and anions will be missing the lattice points.It leads to decrease in density.II) Packing efficiency of simple cubic structure is 52.4%.P.E=1×43πr32r3

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Similar Questions

Match the defects given in Column I with the statements given in Column II.

	Column I		Column II
A.	Simple vacancy defect	1.	Shown by non-ionic solids and increases density of the solid.
B.	Simple interstitial defect	2.	Shown by ionic solids and decreases density of the solid.
C.	Frenkel defect	3.	Shown by non-ionic solids and density of the solid decreases.
D.	Schottky defect	4.	Shown by ionic solids and density of the solid remains the same.