Given below are two statements. Statement I: Frenkel defect…

Chemistry Solid State JEE Main 2021 Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

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:

Statement I is false but Statement II is true

Both Statement I and Statement II are true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Text Solution

Verified by Experts

The correct answer is:

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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