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  • (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.  

(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.

 

 

 

 
 
 
 
 

Answers (1)

(a) Silicon carbide - Covalent Solid
 Argon- Non-polar molecular solids

(b) In ZnO, Zn2+ ions occupy the interstitial sites and electrons are trapped in the interstitial sites for the neutralization. Crystals that shows such type of defects are generally colored. Zinc oxide is white in color but on heating it turns into yellow because on heating it loses oxygen reversibly at high temperature.


(c) Group 12-16 compounds means
compounds formed when elements of group 12 and 16 combine together.
Example = ZnS, CdS. In these compound, bond are not perfectlly covalent and the ionic character depens on the electronegativities of two elements.

Posted by

Sumit Saini

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