First slide

Imperfections in solids

Question

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

Easy

A

Both statements I and II are correct
B

Statement-I is correct and statement-II is incorrect
C

Statement-I is incorrect and statement-II is correct
D

Both statements I and II are incorrect

Solution

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%.
$P . E = \frac{1 \times \frac{4}{3} {πr}^{3}}{{(2 r)}^{3}}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App