The diagram shows the melting and boiling points of four different substances. Which substance has a melting point at −20∘C and a boiling point at 160∘C? 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.