Tincture of iodine is a mixture of two materials $\mathrm{X}$ and $\mathrm{Y}$. The material $\mathrm{Y}$ has a property that its solid form can be converted directly into vapours on heating by a process called $\mathrm{Z}$.

Which process can be used to recover only component $\mathrm{Y}$ from tincture of iodine ?

Define pure substances. Give two examples of pure substances.

What are the two types of pure substance ? Give one example of each type.

Which of the following are pure substances?

Milk, ice, air, iron, hydrochloric acid, wood, brick, mercury.

What is a mixture ? Give two examples.

Which of the following is a mixture?

air, water, sugar, salt, alum.

Is rain water or distilled water a pure substance?

Define elements. Give two examples.