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

  • question_answer
    Zinc oxide loses oxygen on heating according to the reaction, \[ZnO\xrightarrow{heat}Z{{n}^{2+}}+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\] It becomes yellow on heating because

    A) \[Z{{n}^{2+}}\] ions and electrons move to interstitial sites and F-centres are created

    B) Oxygen and electrons move out of the crystal and ions become yellow

    C) \[Z{{n}^{2+}}\] again combine with oxygen to give yellow oxide

    D) \[Z{{n}^{2+}}\] are replaced by oxygen.

    Correct Answer: A

    Solution :

    \[Z{{n}^{2+}}\] ions and electrons move to interstitial sites and F-centres are created which impart yellow colour to ZnO.


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