Question

Compound formed when excess \(CO_2\) is passed through lime water

• A. \(Ca(OH)_2\)
• B. \(CaCO_3\)
• C. \(CaO\)
• D. \(Ca(HCO_3)_2\)

Answer 1

The Correct Option is D

To solve the problem, we need to identify the compound formed when excess \( \text{CO}_2 \) is passed through lime water.

1. Understanding the Reaction:
Lime water is a solution of calcium hydroxide \( \text{Ca(OH)}_2 \) in water. When excess carbon dioxide (\( \text{CO}_2 \)) is passed through lime water, the following reactions occur:

• First, calcium hydroxide reacts with carbon dioxide to form calcium carbonate:
• If excess \( \text{CO}_2 \) is passed, the calcium carbonate reacts further with \( \text{CO}_2 \) to form calcium bicarbonate:

2. Conclusion:
When excess \( \text{CO}_2 \) is passed through lime water, the compound formed is calcium bicarbonate \( \text{Ca(HCO}_3)_2 \).

Final Answer:
The correct answer is (D) \( \text{Ca(HCO}_3)_2 \).