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Q.

Is it true that cotton and wool can be tested for their purity on the flame?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Wool is mainly composed of protein and cotton is mainly composed of cellulose. Both cotton and wool can be tested for their purity on the flame.Wool doesn’t burn when kept on the flame as it is made up of protein. It emits smell while smouldering and leaves a brittle black head behind. Cotton burns when kept on the flame as it contains cellulose and leaves carbon behind.
 
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