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JEE Main & Advanced JEE Main Paper (Held On 11 April 2014)

  • question_answer
    The appearance of colour in solid alkali meta halides is generally due to:   [JEE Main Online Paper ( Held On 11 Apirl  2014 )

    A) Schottky defect               

    B) Frenkel defect

    C) Interstitial position         

    D) F-centres

    Correct Answer: D

    Solution :

                    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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