Question

Out of the given four mixtures, the one that appears clear and transparent is:

• A. Chalk powder and water.
• B. Sand and water.
• C. Starch and water.
• D. Sugar and water.

Answer 1

The correct option is D

Sugar and water.

True solution:

1. A homogenous mixture of two or more substances is known as a true solution.
2. A true solution appears transparent as in a true solution the solute particles are spread evenly throughout the solvent.

Explanation for correct option:

(d) Sugar and water

Sugar and water form a homogenous mixture or a true solution, therefore, it appears clear and transparent.

Explanation for incorrect options:

(a) Chalk powder and water

1. Chalk powder and water forms 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.

(b) Sand and water

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

(c) 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.

Hence, option (d) is the correct option.