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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II and IV I and III

Lyophilic Lyophobic

I and II III and IV

I and III II and IV

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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