Question

When Na₂CO₃ reacts with an acid, which of the following gases is evolved?

• A. \(H_2\)
• B. \(N_2\)
• C. \(O_2\)
• D. \(CO_2\)

Answer 1

The Correct Option is D

Correct answer: \( CO_2 \) 

Explanation:
When sodium carbonate (\( \text{Na}_2\text{CO}_3 \)) reacts with an acid (such as HCl), it produces a salt, water, and carbon dioxide gas. 

The reaction is: \[ \text{Na}_2\text{CO}_3 + 2\text{HCl} \rightarrow 2\text{NaCl} + \text{H}_2\text{O} + \text{CO}_2 \uparrow \] 
The gas evolved in this reaction is carbon dioxide (\( CO_2 \)). 

Hence, the correct answer is: \( CO_2 \).