Question

Three students A, B and C prepared mixtures using chalk powder, common salt and milk respectively
in water. Whose mixture:
a)Would not leave residue on the filter paper after filtration? Why?
b)Would show Tyndall effect? Why?
c)Would be transparent? Why?
d)When left undisturbed would show the settling of the component at the bottom? Why?
e)Could be filtered using filter paper?
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Answer 1

Answer:

a) Mixture done by B will not leave any residue as salt solution is a true solution. b) Tyndall effect will be shown by milk solution of C. It’s a colloidal solution. So it shows tyndall effect. c) Salt solution will obviously be the clear solution. So, again its B. d) Chalk powder mixture of A will settle down when left undisturbed as the particles are too heavy to resist gravity. e) Again, Chalk powder of A can be filtered by filter paper. Although, it is possible to filter milk solution of C also, if sufficiently micro-porous filter is used.