If dilute acid is added to both sodium carbonate and sodium hydrogen carbonate, which test will give the same result?
Answer and explanation
Correct answer: The evolved gas will turn lime water milky
Both sodium carbonate, Na₂CO₃, and sodium hydrogen carbonate, NaHCO₃, react with a dilute acid to release carbon dioxide. The reactions differ in their salt and water products, but the gas test is the same: CO₂ turns limewater milky because insoluble calcium carbonate forms. Thus option A is correct. A pop sound identifies hydrogen, not carbon dioxide, and chlorine is not produced here.
Frequently asked questions
What is the correct answer to this question?
The evolved gas will turn lime water milky
Why is this the correct answer?
Both sodium carbonate, Na₂CO₃, and sodium hydrogen carbonate, NaHCO₃, react with a dilute acid to release carbon dioxide. The reactions differ in their salt and water products, but the gas test is the same: CO₂ turns limewater milky because insoluble calcium carbonate forms. Thus option A is correct. A pop sound identifies hydrogen, not carbon dioxide, and chlorine is not produced here.
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.
