Question

When a non-metal reacts with oxygen, it forms a non-metallic oxide. This non-metallic oxide when reacted with $H_{2}O$, form a substance, ‘X’ with pH value less than 7. What is the nature of X ?

• A. Acidic
• B. Basic
• C. Salt
• D. Neutral

Answer 1

The correct option is A Acidic

Non-metals on reaction with oxygen gas give rise to non-metallic oxides. These non-metallic oxides on reaction with $H_{2}O$ give acidic substance.

For example, sulphur is a non-metal. It forms $S{O}_2$ and $S{O}_3$ and forms $H_{2}S{O}_3$ and $H_{2}S{O}_4$ on reaction with water. On a pH scale, acids always have a value which is less than 7.

Thus, X is acidic in nature.