The phenomenon of Tyndall's effect is not observed in _______.

(a)

emulsion

(b)

colloidal solution

(c)

true solution

(d)

none

Colloidal medicines are more efffective because _______.

(a)

they are clean

(b)

they are easy to prepare

(c)

the germs move towards them

(d)

they are easily assimilated and adsorbed

Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is _______.

(a)

O/W

(b)

W/O

(c)

O/O

(d)

W/W

For chemisorption, which is wrong?

(a)

irreversible

(b)

it requires activation energy

(c)

it forms multimolecular layers on adsorbate

(d)

surface compounds are formed

Colloids are purified by _______.

(a)

precipitation

(b)

coagulation

(c)

dialysis

(d)

filtration