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Question

While performing an activity, Alex puts a few teaspoons of flour into a glass of water. He stirs the mixture for a few minutes and after some time, he observes that the flour particles have settled down at the bottom.

Which of the following properties is true for the mixture formed by Alex:-
I) It always shows Tyndall effect.
II) The size of the constituent particles range from 1-1000 nm.
III) The constituent particles are visible by the naked eye.

A
Both I and II
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B
Both I and III
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C
Only I
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D
Only III
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Solution

The correct option is D Only III
The mixture of flour and water forms a suspension, since flour does not dissolve in water and settles down at the bottom.
Properties of a suspension:-
I) It may or may not show Tyndall effect. When the particles settle down, the suspension breaks and it does not scatter light any more.
II) The size of constituent particles is greater than 1000 nm.
III) The constituent particles are visible to the naked eye.

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