Subjective Type

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. Give a reason.

Solution

Frenkel defect does not change the density of the ionic crystal. Frenkel defect is observed when cation or anion from ionic solid leaves its regular site and moves to occupy a place between the lattice site called interstitial position. Thus, in this defect, the number of cations and anions remains unchanged. Only their location is changed. Hence, the density of the crystal is not affected.

Schottky defect lowers the density of ionic crystal. In this defect, cations or anions are missing. Due to their vacancies, the mass of crystal deceases but their volume remains same. Hence, there is decrease in the density.

SIMILAR QUESTIONS

Solid State

Due to Frenkel defect, the density of ionic solids :

Solid State

Which of the following statement(s) for crystals having Frenkel defect is/are correct?

Solid State

The correct statement(s) regarding defects in solids is(are):

Solid State

Which of the following is a correct statement regarding defects in crystalline solids?

Solid State

Which among the following solids shows Frenkel defect?

Solid State

Frenkel defects are not found in alkali metal halide. Why?

Solid State

Give the correct order of initials T (true) or F (False) for following statements: I. In an anti-fluorite structure, anions form FCC lattice and cations occupy all tetrahedral voids. II. If the radius of cations and anions are $$0.2\ \mathring A$$ and $$0.95\ \mathring A$$, then co-ordination number of cation in the crystal is $$4$$. III. An ion is transferred from a lattice site to an interstitial position in Frenkel defect. IV. Density of crystal always increases due to substitutional impurity defect.

Solid State

Density of a crystal decreases due to Schottky defect and remains constant due to Frankel defect. If true enter 1,else enter 0.

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