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Solution


Q.

Which of the following is not a characteristic of Diamond
1 Hardest substance  
2 High thermal conductivity  
3 High refractive index  
4 Good conductor of electricity  

Ans.

(4)

Diamond is the hardest substance known, this is due to its structure in which carbon atoms are arranged in a lattice giving it a giant covalent structure with great forces of attraction. Diamond has high thermal conductivity, this is due to the stiff chemical bonds between the carbon atoms. It has high refractive index which gives it the transparency and brilliance and it is bad conductor of electricity because of the absence of free mobile electrons.