Question

Which of the following oxides is acidic in nature?

• A. Sodium Oxide
• B. Iron Oxide
• C. Calcium Oxide
• D. Sulphur Dioxide

Answer 1

The correct option is D

Sulphur Dioxide

The explanation for the correct answer

Option D: Sulphur Dioxide (${\mathbf{SO}}_{\mathbf{2}}$)

• Generally, the Oxides of non-metals are acidic in nature.
• When non-metals are reacted with water it forms an acidic solution.
• As Sulphur is a non-metal it will form Sulphur Dioxide when reacts with Oxygen, which in turn to have acidic property.
• Hence, Option (D) is correct.

The explanation for the incorrect answer

Option A: Sodium Oxide (${\mathbf{Na}}_{\mathbf{2}}\mathbf{O}$)

• The oxides of metals will be basic in nature.
• As Sodium is a metal, its oxides will be basic in nature.
• This option is incorrect.

Option B: Iron Oxide ($\mathbf{FeO}$)

• The oxides of metals will be basic in nature.
• As Iron is a metal, its oxide will be basic in nature.
• This option is incorrect.

Option C: Calcium Oxide ($\mathbf{CaO}$)

• The oxides of metals will be basic in nature.
• As Calcium is a metal, its oxide will be basic in nature.
• This option is incorrect.

Therefore, option D is correct. Sulphur dioxide is acidic in nature.