Question

What type of oxides are formed when non-metals combine with oxygen?

Answer 1

When non-metals combine with oxygen, they typically form acidic oxides. These oxides are also known as non-metallic or acidic anhydrides. The resulting compounds, when dissolved in water, produce acidic solutions. The acidic nature arises because non-metal oxides tend to react with water to form acids.
For example:
Carbon Dioxide (CO₂): $3CO_2​+H_2​O→H_2​CO_3$​
Carbon dioxide dissolves in water to form carbonic acid.

Sulfur Dioxide (SO₂): $3SO_2​+H_2​O→H_2​SO_3​$
Sulfur dioxide dissolves in water to form sulfurous acid.

Nitrogen Dioxide (NO₂): $2NO_2​+H_2​O→2HNO_3​$
Nitrogen dioxide dissolves in water to form nitric acid.