How can the gas formed when dilute acid is added to sodium carbonate be confirmed?
Answer and explanation
Correct answer: By turning lime water milky
An acid reacts with a carbonate to produce a salt, water and carbon dioxide. For example, sodium carbonate with hydrochloric acid gives sodium chloride, water and CO₂. Passing this gas through limewater produces insoluble calcium carbonate, making the limewater milky: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. Thus option A is correct. The other tests indicate acidic, basic or hydrogen-related behaviour, not carbon dioxide.
Frequently asked questions
What is the correct answer to this question?
By turning lime water milky
Why is this the correct answer?
An acid reacts with a carbonate to produce a salt, water and carbon dioxide. For example, sodium carbonate with hydrochloric acid gives sodium chloride, water and CO₂. Passing this gas through limewater produces insoluble calcium carbonate, making the limewater milky: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. Thus option A is correct. The other tests indicate acidic, basic or hydrogen-related behaviour, not carbon dioxide.
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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