Its freezing point will be below 0°C due to the presence od a non-volatile impurity in it.

Its freezing point will be below 0°C due to the presence od a non-volatile impurity in it.
Substance | Melting point(°C) | Boiling point(°C) |
X | -219 | -183 |
Y | 119 | 445 |
Z | -15 | 78 |