Question

Some of the properties given below are for colloidal sols.
(I) Viscosity is same as that of the medium.
(II) Extensive hydration takes place.
(III) Migration of the particles under electric field.
(IV) Particles cannot be detected even under ultramicroscope. Properties applicable for lyophilic and lyophobic colloidal sols are

	Lyophilic	Lyophobic
1	I and II	III and IV
2	I and II	II and IV
3	II and IV	I and III
4	II and III	I and IV

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (C)

In lyophilic colloidal sol, extensive hydration takes place and their particles cannot be detected even under ultra-microscope.
In lyophobic colloidal sol, viscosity is same as that of the medium and particles migrate towards anode or cathode on passing electric current.
Thus, lyophilic$-II,IV$
lyophobic $-1,III$