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  5. The Solid State / ठोस प्रावस्था

12th Class Chemistry The Solid State / ठोस प्रावस्था Question Bank MCQs - The Solid State

  • question_answer
    The anionic sites occupied by unpaired electrons are called F-centres or colour centres. They impart (X) colour to the crystals of NaCl. Excess of lithium makes Lid crystals (Y) and excess of potassium makes KCl crystals (Z). (X), (Y) and (Z) are

    A) yellow, green and pink respectively

    B) pink, yellow and violet (or lilac) respectively

    C) yellow, pink and violet (or lilac) respectively

    D) red, yellow and pink respectively.

    Correct Answer: C

    Solution :

    F- centres impart yellow colour to the crystals of NaCl when heated in an atmosphere of sodium vapour. Similarly, excess of lithium LiCl crystals pink and excess of potassium makes KCl crystals violet (or lilac).


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