Question
(a) How can a colloidal solution and true solution of the same colour be distinguished from each other ?
(b) List four applications of adsorption.
Solution
Answer:
a) True solution posses molecular dimensin 10-10 to 10-9m. Whereas in colloidal solution the sizes of particles is 1-100nm thus colloidal solution show tyndall effect. thus we can distinguised true solution and colloidal solution by tyndall effect.
b)
a) True solution posses molecular dimensin 10-10 to 10-9m. Whereas in colloidal solution the sizes of particles is 1-100nm thus colloidal solution show tyndall effect. thus we can distinguised true solution and colloidal solution by tyndall effect.
b)
(i) Production of high vacuum: The remaining traces of air can be adsorbed by charcoal from a vessel evacuated by a vacuum pump to give a very high vacuum.
(ii) Gas masks: Gas mask (a device which consists of activated charcoal or mixture of adsorbents) is usually used for breathing in coal
mines to adsorb poisonous gases.
(iii) Control of humidity: Silica and aluminium gels are used as adsorbents for removing moisture and controlling humidity.
(iv) Removal of colouring matter from solutions: Animal charcoal removes colours of solutions by adsorbing coloured impurities.
mines to adsorb poisonous gases.
(iii) Control of humidity: Silica and aluminium gels are used as adsorbents for removing moisture and controlling humidity.
(iv) Removal of colouring matter from solutions: Animal charcoal removes colours of solutions by adsorbing coloured impurities.
