Question

The process, used for purification of a substance which has boiling point 350 K but it starts decomposing near this temperature, is : also explain

A)distillation under reduced pressure

• B)

  fractional distillation

  C)

steam distillation

• D)

  sublimation

Answer 1

The process used for purification is distillation under reduced pressure.

When the external pressure is reduced, the substance boils at a temperature lower than normal. In this way the substance will convert into vapour at a lower temperature and escape being decomposed. On condensation, the pure substance will be obtained.