Question

Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
(a) What could X be ?
(b) What could Y be ?
(c) Name the process Z.
(d) Which process would you use to recover both the components X and Y from tincture of iodine ?
(e) Which process can be used to recover only components Y from tincture of iodine ?

Answer 1

1. y may be iodine
2. and x may be water
3. the process z may be crystallisation
4. dissolution process will be used to again attain the tincture of iodine
5. evaporation may be used

Answer 2

(a) X could be alcohol.

(b) Y could be iodine.

(c) The process used here is sublimation

(d) Distillation is used to recover both the components X and Y from tincture of iodine.

(e) Evaporation can be used to recover Y components from tincture of iodine.

Explanation:

• The method used for separating substances from a mixture that sublime on heating is sublimation.
• The method used for separating the mixture of components having two miscible liquids is called distillation. These liquids can boil without disintegration.
• Evaporation is a method used for separating solid substance from the dissolved water.