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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    The appearance of colour in solid alkali meta halides is generally due to:

    A) Schottky defect              

    B) Frenkel defect

    C) Interstitial position          

    D) F-centres

    Correct Answer: D

    Solution :

    [d] The appearance of colour in alkali metal halides is generally due to F-centres. F centers in \[NaCl\] produce a band of optical absorption towards the blue end of visible spectrum, thus the colour appears yellow under transmitted light. On the other hand, \[KCl\] with F-centers appears magenta, and \[KBr\] appears blue.


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