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Question
Assertion: KCl crystals appear violet in colour.
Reason: The violet colour is due to electrons trapped in anion vacancies.
Options
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
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Solution
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
Explanation:
When KCl is heated in potassium vapour, some Cl− ions leave their lattice sites, creating anion vacancies. These vacancies trap electrons, forming F-centres. These trapped electrons absorb visible light, and the crystal appears violet. Hence, the Reason correctly explains why KCl crystals appear violet.
