KCET · Chemistry · p Block Elements (Group 13 & 14)

Which property of \(\mathrm{CO}_2\) makes it biologically and geo-chemically important ?

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

Verified Solution

Answer & Solution

Correct Answer

(B) Its low solubility in water

Step-by-step Solution

Detailed explanation

The property of low solubility of carbon dioxide in water makes it biologically and geo-chemically important. Carbon dioxide on reaction with water form carbonic acid, which dissociates to give \(\mathrm{HCO}_3^{-}\)ions. \(\mathrm{H}_2 \mathrm{CO}_3 / \mathrm{HCO}_3^{-}\) buffer system helps to maintain pH of blood between \(7.26-7.42\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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