Question

Four students prepared mixtures in water by taking sugar, sand, chalk powder and starch respectively, in four different test tubes. After stirring, the mixture that appeared clear and transparent was that of:

• A. starch and water
• B. chalk powder and water
• C. sand and water
• D. sugar and water

Answer 1

The correct option is D

sugar and water

Explanation for correct option:

(d) Sugar and water

1. The sugar and water solution is a homogenous mixture of sugar and water.
2. This will result in a true solution that is transparent and clear.

Explanation for incorrect options:

(a) Starch and water

1. Starch and water form a colloidal solution and a colloidal solution is never transparent and clear.
2. A solution in which the size of solute particles is intermediate between those in true solution and suspension is called a colloidal solution.

(b) Chalk powder and water

1. Chalk powder and water form a suspension.
2. A suspension is a solution in which the particles of solute settle down to the bottom of the tank when left untouched for some time.

(c) Sand and water

1. Sand and water is an example of suspension.
2. Sand doesn't dissolve in water. It forms a suspension.

Hence, option (d) is the correct option.