Question

The following table show melting and boiling points of four substances which substances is solid at room temperature substance a m.p -186 boiling point -183 Substance B melting point -6 boiling point 120 substance C melting point 0 boiling point 100 substance D melting point 36 boiling point 130​

Answer 1

Answer:

Melting point is the transition temperature from solid to liquid and boiling point is the transition temperature from liquid to gas. From the diagram , the substance D has melting point at −40oC. So the substance D is a solid at −40oC. The boiling point of substances A and B  is below the temperature 120oC. So , the substances A and B are gases at 120oC.