Question

To prepare a colloidal solution of starch, we should :

(a) Add starch powder to boiling water and cool.
(b) Add starch powder to cold water and boil. (c) Heat starch powder, add it to cold water and then bring to boil.
(d) Add a thin paste of starch to boiling water while stir​

Answer 1

Explanation:

Particles of cornstarch are just the right size (about 100 to 800 nanometers in diameter) to make a colloidal solution with water. Add one tablespoon of the cornstarch to the small bowl or cup. Fill the empty cup, mug or drinking glass with water.Take a mortar and add 500 mg of starch to it.

Pour a few drops of distilled water and pestle the starch into a thin paste.

Transfer the grinded paste to a 50 ml beaker.

Take a 250 mL beaker and pour 100 mL of distilled water to it and heat the water to boiling

Answer 2

Answer:

The answer should be option D

add a thin paste of starch to boiling water while stir

hope it helped ☺️☺️