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Choose the correct statement

a) All substances can be divided into colloids and crystallines
b)Many substances can be brought into colloidal atae through different methods
c) Only some substances are colloids. Theothers are not.
d) All colloidal solutions exhibit Tyndall effect.


The correct statement is d. If it is not showing tyndall effect, then it is not a colloid.
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It is true that all colloidal solutions exhibit Tyndall effect. 
The effect is the scattering of light by the small tiny colloid particles. If there no small colloidal suspended in a liquid, then the light is not scattered and it would be  a transparent solution or, it could be an opaque one, in which case the light is reflected.
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