The gas released by reaction of an acid with carbonate turns lime water milky. Which gas is it?
Answer and explanation
Correct answer: Carbon dioxide
When a carbonate reacts with an acid, the products are a salt, water, and carbon dioxide; in ionic form, carbonate ions react with hydrogen ions to produce CO₂ and water. Passing this gas through limewater forms insoluble calcium carbonate, which makes the solution milky. Thus option B is correct. Hydrogen gives a pop test, whereas oxygen and nitrogen do not produce the characteristic limewater reaction.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
When a carbonate reacts with an acid, the products are a salt, water, and carbon dioxide; in ionic form, carbonate ions react with hydrogen ions to produce CO₂ and water. Passing this gas through limewater forms insoluble calcium carbonate, which makes the solution milky. Thus option B is correct. Hydrogen gives a pop test, whereas oxygen and nitrogen do not produce the characteristic limewater reaction.
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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
