12th Class Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank 12th CBSE Chemistry The d-and f-Block Elements

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                          Why is ZnO yellow when hot and white when cold?

    Answer:

                      \[Z{{n}^{2+}}\] ion (ZnO) has \[3{{d}^{10}}\] electronic configuration with all the electrons paired. Therefore, ZnO is white. The yellow colour of ZnO is due to non-stoichiometric defect leading to extra cation at the interstitial sites. For details, consult Section 8.4.


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