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a
Heat changes in liquid
b
Conventional currents
c
The impact of molecules of the dispersion medium on the colloidal particles
d
Attractive forces between the colloidal particles and molecules of dispersion medium
answer is C.
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Detailed Solution
Brownian movement -- Zig-zag motion all over the field of view. It is due to the unbalanced bombardment of the particles by the molecules of the dispersion medium. It has a stirring effect which does not permit the particles to settle. It is Thus responsible for the stability of the colloid.