Sulphur is an odourless, tasteless, light yellow solid. 

Zinc is extracted from zinc blende, $\mathrm{ZnS}$.  Zinc blende is heated in air to give zinc oxide and sulphur dioxide. Most of the sulfur dioxide is used to make sulfur trioxide. This is used to manufacture sulfuric acid. Some of the acid is used in the plant, but most of it is used to make fertilisers.

(i) Give another use of sulfur dioxide.

Zinc blende is heated in air to give zinc oxide and sulphur dioxide. Most of the sulphur dioxide is used to make sulphur trioxide. This is used to manufacture sulphuric acid. Some of the acids are used in the plant, but most of them are used to make fertilizers.

(ii) Describe how sulphur dioxide is converted into sulphur trioxide.

${\mathrm{SO}}_2$ acts as a bleaching agent in presence of moisture. This is due to the _____  nature of ${\mathrm{SO}}_2$. (reducing / oxidising)

Why dry ${\mathrm{SO}}_2$ does not bleach dry flowers?