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Q.

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 ultra-microscope.

Properties applicable for lyophilic and lyophobic colloidal sols are

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a

Lyophilic              Lyophobic

I and II                   III and IV

b

I and III                  II and IV

c

II and IV                 I and III

d

II and III                  I and IV

answer is C.

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Detailed Solution

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.

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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 ultra-microscope.Properties applicable for lyophilic and lyophobic colloidal sols are