Process of converting solid camphor into camphor vapour is called

The conversion of a solid directly into gas is called as :

Which one of the following processes is NOT useful for purification of solid impurities?

Which of the following process/ processes release heat? (i) Condensation (ii) Vaporisation (iii) Freezing (iv) Melting Correct option is :

Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to

A sample of any of the following substances disappears after sometime when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called :