Give two reasons to justify:
Q. Give two reasons to justify:
(a) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature.
Ans. (a) Water is a liquid because :
(i) intermolecular spaces are very large.
(ii) intermolecular forces are less and kinetic energy is more.
The molecules of water can interchange their spaces. Thus, water is in liquid state at room temperature.
(b) Iron almirah is a solid because :
(i) intermolecular forces are very large.
(ii) intermolecular spaces and kinetic energy are very small.
The molecules of iron almirah are held very tightly. The iron almirah has a definite shape and definite volume and thus, it is a solid.
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