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प्रश्न
The presence of F-centres in a crystal makes it ______.
विकल्प
conducting
colourless
non-conducting
coloured
MCQ
रिक्त स्थान भरें
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उत्तर
The presence of F-centres in a crystal makes it coloured.
Explanation:
F-centres (Farbe centres) are anion vacancies in a crystal that trap free electrons. These trapped electrons can absorb certain wavelengths of visible light and re-emit the rest, giving the crystal a characteristic colour. For example, NaCl appears yellow when it contains F-centres.
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