Which one of the following statements is correct about distillation of a liquid that boils without?
1) It is a process of separating a mixture based on the differences in boiling points of the components.
2) It is a process of separating a mixture based on the differences in melting points of the components.
3) It is a process of separating a mixture based on the differences in solubility of the components.
4) It is a process of separating a mixture based on the differences in density of the components.