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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 from the options given below:

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are false

Correct answer: Statement I is true but Statement II is false

Solution

Statement I is correct because Frenkel defects involve the displacement of ions, creating both vacancies and interstitials. However, Statement II is incorrect as F-centres, which are responsible for color in ionic solids, are typically associated with Schottky defects rather than Frenkel defects.

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