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Q.

Is it true that pure substances have fixed melting and boiling points?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Pure substances contain only one type of substance. All the particles of pure matter are the same. It has a fixed composition and similar properties. Pure substances are homogeneous in nature. They have a uniform composition throughout. That is why the melting or boiling points of pure materials are fixed.
 
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