Question

Which one of the following is an acidic oxide ?

• A. MgO
• B. Na₂O
• C. CaO
• D. CO₂

Answer 1

The Correct Option is D

To solve this question, we need to identify which of the given oxides is acidic in nature.

1. Understanding Acidic Oxides:
Acidic oxides are generally formed by non-metals and react with water to form acids. For example, carbon dioxide (\( CO_2 \)) reacts with water to form carbonic acid.

2. Evaluating the Options:

• (A) \( \text{MgO} \) – Magnesium oxide is a basic oxide, as it reacts with water to form magnesium hydroxide, a base.
• (B) \( \text{Na}_2\text{O} \) – Sodium oxide is also a basic oxide, reacting with water to form sodium hydroxide, a base.
• (C) \( \text{CaO} \) – Calcium oxide is a basic oxide, reacting with water to form calcium hydroxide, a base.
• (D) \( \text{CO}_2 \) – Carbon dioxide is an acidic oxide, as it reacts with water to form carbonic acid, \( H_2CO_3 \), which is acidic. ✔

Final Answer:
The correct answer is (D) \( CO_2 \), as it is an acidic oxide.