A substance gives carbon dioxide with acid and its solution is basic. Which substance can it be?
Answer and explanation
Correct answer: Sodium carbonate
Carbonates react with acids to release carbon dioxide, for example: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Sodium carbonate is also a salt of a strong base and a weak acid, so its aqueous solution is alkaline because carbonate ions hydrolyse water and produce OH⁻ ions. Sodium chloride is neutral, copper sulphate is not the expected carbonate, and ammonium chloride is acidic. Thus option A is correct.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate
Why is this the correct answer?
Carbonates react with acids to release carbon dioxide, for example: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Sodium carbonate is also a salt of a strong base and a weak acid, so its aqueous solution is alkaline because carbonate ions hydrolyse water and produce OH⁻ ions. Sodium chloride is neutral, copper sulphate is not the expected carbonate, and ammonium chloride is acidic. Thus option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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