A) \[{{10}^{-12}}\] to \[{{10}^{-19}}\]m
B) \[{{10}^{-3}}\]to \[{{10}^{-9}}\]m
C) \[{{10}^{-9}}\]to \[{{10}^{-12}}\] m
D) \[{{10}^{-6}}\] to \[{{10}^{-9}}\] m.
Correct Answer: D
Solution :
A system is said to be in colloidal state if particles of one or more components have the size range \[{{10}^{-6}}\] to \[{{10}^{-9}}\]. In other words, the colloidal solution is a heterogeneous dispersion of solute particles of size ranging between \[{{10}^{-6}}\] to\[{{10}^{-9}}\] m into a solvent. Particles are visible only with an ultramicroscope.
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