Question

Which one of the following is NOT a kind of colloidal material in the natural aquatic/terrestrial envitonment?

Select one .

a.Humic acid

b.Al 2 St 2 O 3 (OH) 4

c.Suspended sediments.

d.Feldspar including CaAl 2 Si 2 O 8 and KA/Si 3O8

e.Clay minerals such as kaolinite and montmorillonite

Answer 1

Option c is the correct choice. Suspended sediments are generally present in agitated particle forms, which settle down in the absence of reasonable extent of turbulence in the aquatic system or the environment on land. These particles, howsoever fine in size, do not necessarily form the stable colloidal forms, and are only suspended as long as there is some sort of "churning" caused by various forces in an ecosystem such as wind, waves, ocean currents, thermal heating and cooling of aquatic systems, etc. Colloidal material, on the other hand, is more fine than coarse. It forms stabilized states of particles in the fluid where the bonds between the particles of the material and fluid are stronger in nature, as compared to the suspended dirt and other particles.
(Feel free to ask any specific query in the regard.)