JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer 67) A crystal of \[ZnO\] is heated evolve \[{{O}_{2}}\] and forms defect; the type of defects formed will be

    A)  Metal excess                 

    B)  Metal deficiency

    C)  Impurities                     

    D)  None of these

    Correct Answer: A

    Solution :

     \[ZnO\xrightarrow{heat}Z{{n}^{2+}}+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\] Excess \[Z{{n}^{2+}}\] ions are trapped by vacant interstitial sites and the electrons are in neighbouring interstitial sites.

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