A substance gives carbon dioxide with acid and forms a basic solution in water. Which substance is most suitable?
Answer and explanation
Correct answer: Sodium carbonate
Evolution of carbon dioxide when an acid is added is a characteristic test for a carbonate or hydrogencarbonate. Sodium carbonate reacts with an acid, for example: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. In water, Na₂CO₃ undergoes hydrolysis and produces a basic solution because carbonate ions react with water to form hydroxide ions. Ammonium chloride is acidic, sodium chloride is nearly neutral, and copper sulphate is not the required carbonate. Thus option C is correct.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate
Why is this the correct answer?
Evolution of carbon dioxide when an acid is added is a characteristic test for a carbonate or hydrogencarbonate. Sodium carbonate reacts with an acid, for example: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. In water, Na₂CO₃ undergoes hydrolysis and produces a basic solution because carbonate ions react with water to form hydroxide ions. Ammonium chloride is acidic, sodium chloride is nearly neutral, and copper sulphate is not the required carbonate. Thus option C 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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