Density of solid is more than liquids and gases. Why?

One gram is more than

Rancidity is more in oils than in fats. WHy?

A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body ?

Name the type of colloid obtained when a liquid is dispersed in a solid.

Why noble gases are called rare gases ?

a' and 'b' are van der Waals' constant for gases. Chlorine is more easily liquefied than ethane because