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a
in case of A the particle size lies in the range of 1 to 100 nm
b
B and C are always homogeneous in natural phase
c
B contain two phases, disperse phase and dispersion medium.
d
in C particles have an enormous surface area per unit mass
answer is D.
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Detailed Solution
(C) Colloidal solution are heterogeneous. They are two phase system, dispersed phase and dispersion medium. There is a definite surface of separation between each particle of dispersed phase and the dispersion medium