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(a) Based on the nature of intermolecula...

(a) Based on the nature of intermolecular forces, classify the following solids: Silicon carbide, Argon.
(b) ZnO turns yellow on heating. Why?
( c) What is meant by groups 12-16 compounds? Give an example.

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These are the compounds prepared by combination of group 12 and group 16 elements and behave like semiconductors, e.g., ZnS, CdS, CdSe, etc. The bonds in these compounds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements.
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