Answer:
If
we break or cut a piece of cube of sodium chloride, we find a smooth surface on
both sides. However, in case of glass, we get an irregular surface. This is on
account of difference in the cleavage property of crystalline and amorphous
solids. If we cut a crystalline solid, such gas sodium chloride, we get two
smooth surfaces. On the other hand, the cleavage of an amorphous solid such as
glass leads to irregular surfaces.
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