Question

Which property of CO₂ makes it biologically and geo-Chemically important?

• A. Its acidic nature
• B. Its low solubility in water
• C. Its high compressibility
• D. Its colourless and odourless nature

Answer 1

The Correct Option is A

Correct Answer: Its acidic nature
 
Explanation:
The biological and geochemical importance of carbon dioxide (CO₂) largely comes from its acidic nature.

• In water, CO₂ reacts to form carbonic acid (H₂CO₃), which plays a crucial role in maintaining the pH balance of blood and other biological fluids.
• In geology, CO₂ dissolves in rainwater forming weak carbonic acid, which contributes to chemical weathering of rocks (especially carbonates).

Thus, its acidic nature is key to many biological and earth processes.