Given below are two statements:
Statement I: Frenkel defects are vacancy as well as interstitial defects.
Statement II: Frenkel defect leads to colour in ionic solids due to presence of F-centres.
Choose the most appropriate answer for the statements from the options given below:
(JEE Main 2021)

Both Statement I and Statement II are false

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Both Statement I and Statement II are true

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Statement I is false but Statement II is true

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Statement I is true but Statement II is false

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Solution

The correct option is D Statement I is true but Statement II is false
Frenkel defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site.

It creates a vacancy defect at its original site and an interstitial defect at its new location.

F-centre is formed in metal excess defect which is a non-stoichiometric defect.

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Similar questions

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

$\begin{matrix} C o l u m n I & C o l u m n I I A . & s i m p l e v a c a n c y d e f e c t & 1. S h o w n b y n o n - i o n i c s o l i d s a n d i n c r e a s e s d e n s i t y o f t h e s o l i d B . & S i m p l e i n t e r s t i t i a l d e f e c t & 2. S h o w n b y i o n i c s o l i d s a n d d e c r e a s e s d e n s i t y o f t h e s o l i d c . & F r e n k e l d e f e c t & 3. S h o w n b y n o n - i o n i c s o l i d s a n d d e n s i t y o f t h e s o l i d d e c r e a s e s D . & S c h o t t k y d e f e c t & 4. S h o w n b y i o n i c s o l i d s a n d d e n s i t y o f t h e s o l i d r e m a i n s t h e s a m e \end{matrix}$

Cations are present in the interstitial sites in ...........

(a) Frenkel defect (b) Schottky defect

Which of the following defects decrase the density ?

(a) Interstitial defect (b) Vacancy defect

Which of the following statements are not true?

(a) Vacancy defect results in a decrease in the density of the substance

(b) Interstitial defects result in an increase in the density of the substance

(d) Frenkel defect results in an increase in the density of the substance

Q. Given below are two statements:
Statement I: Frenkel defects are vacancy as well as interstitial defects.
Statement II: Frenkel defect leads to colour in ionic solids due to presence of F-centres.
Choose the most appropriate answer for the statements from the options given below:

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Given below are two statements: Statement I: Frenkel defects are vacancy as well as interstitial defects. Statement II: Frenkel defect leads to colour in ionic solids due to presence of F-centres. Choose the most appropriate answer for the statements from the options given below: (JEE Main 2021)

Given below are two statements:
Statement I: Frenkel defects are vacancy as well as interstitial defects.
Statement II: Frenkel defect leads to colour in ionic solids due to presence of F-centres.
Choose the most appropriate answer for the statements from the options given below:
(JEE Main 2021)