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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 A places a piece of chalk in water.
student B places powdered chalk in water.
student C places powdered chalk in water and then shakes the mixture vigorously.
student D places powdered chalk in dil. HCl.
Which of the students followed the correct way of preparation of suspension?

A
Student A
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B
Student B
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C
Student C
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D
Student D
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Solution

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.


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