Question

Rohit mixed starch with water, boiled the mixture well and stirred it. He observed that:

• A. starch floats on the surface of water.
• B. starch settles down at the bottom.
• C. starch forms a translucent mixture.
• D. starch forms a transparent mixture.

Answer 1

The correct option is C

starch forms a translucent mixture.

Colloidal solution: A colloidal solution is a solution in which the size of the solute particles is intermediate to that of suspension and true solution. Example - milk.

Explanation for correct option:

(c)Starch forms translucent mixture:

1. When starch is added to water a colloidal solution is formed and when it is heated, the molecules of starch burst out releasing glucose in the water.
2. This makes the mixture look translucent in color.

Explanation for incorrect options:

Since the starch forms a translucent mixture thus options (a), (b) and (d) are incorrect.

Hence, option (c) is the correct option.