Question

The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas. When sulphur dioxide is dissolved in_________________, sulphurous acid is formed. The sulphurous acid turns _____________ litmus paper to ____________. Generally oxides of __________ are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.

• A. oxygen
• B. water, blue, non-metals

Answer 1

Reaction of sulfur with oxygen

• The reaction is as follows:-
• $$\begin{gathered} \mathrm{S}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{SO}}_2\left(\mathrm{g}\right) \\ \mathrm{Sulphur}\mathrm{dioxide} \end{gathered}$$
• So, the formation of sulfur dioxide gas takes place when sulfur reacts with oxygen.
• So, the first blank must be filled with oxygen.

Reaction of Sulphur dioxide with water

• The reaction is as follows:-
• $$\begin{gathered} {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{SO}}_2\left(\mathrm{g}\right)\to {\mathrm{H}}_2{\mathrm{SO}}_3\left(\mathrm{aq}\right) \\ \mathrm{sulfurous}\mathrm{acid} \end{gathered}$$
• So, the second blank must be filled with water.
• Acid changes blue litmus to red.
• So, sulfurous acid changes blue litmus to red.
• So, the third blank must be filled with blue, and the fourth blank must be filled with red.

Oxides of nonmetal

• When non-metallic oxides mix with water, it forms an oxyacid.
• So, oxides of non-metals are acidic in nature.

Two questions on the basis of this information.

• (i) Which gas is formed when sulfur reacts with oxygen?
• (ii) What is the nature of oxides of non-metals?