(a) To check whether the substance is pure or not.
(b) To identify and characterise the substance.
(a) To check whether the substance is pure or not.
(b) To identify and characterise the substance.
| Substance | Melting point(°C) | Boiling point(°C) |
| X | -219 | -183 |
| Y | 119 | 445 |
| Z | -15 | 78 |