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5. To prepare a colloidal solution of starch, we should
(a) add starch powder to boiling water and then cool
(b) add starch powder to cold water and then boil
(c) heat starch powder, add it to cold water and then bring to boil
(d)add a thin plate of starch to boiling water while stirring.

6. A solution is transparent blue. It is
(a) a suspension
(b) colloid
(c) true solution
(d) both a colloid and a true solution
7. The correct designation representing* the particle size is
(I) (II) (III)

(a) I = true solution II = suspension
III = colloid
(b) I = suspension II = true solution
III = colloid
(c) I = colloid II = suspension
IF! = true solution
(d) I = true solution II = colloid
III = suspension

8. The random zig-zag motion of colloidal particles is called
(a) Tyndall effect (b) ultrafiltration
(c) Brownian motion (d) centrifugation

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