1.

Fill in the blanks(a) Evaporation takes place at........... temperature.(b)............process is just reverse of melting.(c) ................ is a process that involves direct conversion of a solid into its vapor on heating.(d) The temperature at which a solid converts into a liquid is called its................ (e) The smallest unit of matter that exists freely in nature is called............. (f) Molecules of a substance are always in a state of........... and so they possess...............(g) Intermolecular space is maximum in......... less in......... and the least in........... (h) Intermolecular force of attraction is maximum in......... less in.......... and the least in...........

Answer»

(a) Evaporation takes place at all temperature.

(b) Freezing process is just reverse of melting.

(c) Sublimation is a process that involves direct conversion of a solid into its vapor on heating.

(d) The temperature at which a solid converts into a liquid is called its melting point.

(e) The smallest unit of matter that exists freely in nature is called molecule.

(f) Molecules of a substance are always in a state of motion and so they possess kinetic energy.

(g) Intermolecular space is maximum in gases less in liquids and the least in solids.

(h) Intermolecular force of attraction is maximum in solids, less in liquids and the least in gases.



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