Question

1) on the basis of molecular theory, explain why Solids have a definite shape and definite volume.
2) on the basis of molecular theory, explain why liquids have a definite volume, but no definite shape.
3) on the basis of molecular theory, explain why gases have neither definite shape and nor definite volume.

Answer 1

solids have definite shape and volume because the atoms present in most of solids are closely packed and hence they are not free to move so they have definite shape and volume.
the atoms are loosely packed in liquid when compared to solids therefore they have definite volume but not shape.
wereas gasses have atoms very loosely packed therefore they neither have fixed shape and volume

Answer 2

solid have definite shape and definite volume because because the molecule of solid are very tightly packed. In liquid the molecule are not tightly packed them solid so they have definite volume but not definite shape. in gas molecules are negligible so they have not definite shape no definite volume