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Question

The diagram shows the melting and boiling points of four different substances. Which substance has a melting point at 20C and a boiling point at 160C? Also identify the two substances having same boiling points.
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Solution

From the diagram we have made the following table :

Substance Melting point (oC) Boiling point (oC)
A 20 80
B 20 160
C 30 160
D 30 75
From the table, the substances A and B both have melting point at 20oC and the substances B and C both have boiling point at 160oC.
The substance B and C have same boiling point.


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