Why can bubbles form when acid falls on marble?
Answer and explanation
Correct answer: Marble contains calcium carbonate which gives gas with acid
Marble is mainly calcium carbonate, CaCO₃. Acids react with carbonates to form a salt, water, and carbon dioxide: acid + CaCO₃ → salt + H₂O + CO₂. The escaping carbon dioxide appears as bubbles on the marble surface. Therefore option A correctly identifies both the substance and the gas-forming reaction. The other options either describe nonexistent materials or an incorrect physical process.
Frequently asked questions
What is the correct answer to this question?
Marble contains calcium carbonate which gives gas with acid
Why is this the correct answer?
Marble is mainly calcium carbonate, CaCO₃. Acids react with carbonates to form a salt, water, and carbon dioxide: acid + CaCO₃ → salt + H₂O + CO₂. The escaping carbon dioxide appears as bubbles on the marble surface. Therefore option A correctly identifies both the substance and the gas-forming reaction. The other options either describe nonexistent materials or an incorrect physical process.
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.
