Explain the reaction of non-metals with oxygen

Non-metals react with oxygen in the air to produce non-metal oxides.

Explanation:

When non metals react with oxygen they form acidic oxides. They turn blue litmus paper to red. Examples are

carbon + oxygen → carbon dioxide

sulphur + oxygen → sulphur dioxide

These oxides dissolve in the water in the clouds to form acid rain. Acid rain damages rocks and buildings, and harms wildlife.