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Question

Which are not true about the amorphous solids?

A
They have isotropic character
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B
They undergo cleavage to give clean surface
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C
They have high degree of rigidity
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D
They do not have sharp and fixed melting point
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Solution

The correct option is B They undergo cleavage to give clean surface
A. Amorphous solids are isotropic in nature like liquids. It is because there is no long range order in them and arrangement is irregular along all the directions. Therefore, any physical property can be observed same in all the direction, i.e. isotropic nature.
B. We get irregular cleavage in amorphous solid. Hence, they undergo cleavage to give rough surface.
C. Amorphous solid are rigid.
D. No sharp and fixed melting point due to irregular structure. They possesses a wide range of melting point.
Option (B) is the correct answer.

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