Question

A teacher instructed four students $A,B,C$ and $D$ to prepare a suspension of chalk in water. The students prepared suspension in the following manner:
student ${}^{\prime }{A}^{\prime }$ places a piece of chalk in water.
student ${}^{\prime }{B}^{\prime }$ places powdered chalk in water.
student ${}^{\prime }{C}^{\prime }$ places powdered chalk in water and then shakes the mixture vigorously.
student ${}^{\prime }{D}^{\prime }$ places powdered chalk in dil. $HCl$.
Which of the students followed the correct way of preparation of suspension?

• A. Student A
• B. Student B
• C. Student C
• D. Student D

Answer 1

The correct option is C Student C

Dissolving chalk powder in water results in the formation of a suspension. Stirring it for sometime ensures uniform dispersion of the chalk particles in water. Chalk powder does not dissolve in water. It just forms a suspension and after some time settles down under the influence of gravity.

So, option $C$ is correct.