A solution turns blue litmus red and releases gas with a metal carbonate. What type of solution is it?
Answer and explanation
Correct answer: Acidic
Blue litmus turning red is a characteristic test for an acidic solution. A second independent observation supports the same conclusion: acids react with metal carbonates to form a salt, water, and carbon dioxide gas, for example acid + carbonate → salt + H₂O + CO₂. Thus the solution is acidic, making option D correct. A basic or neutral solution would not normally produce this combined indicator pattern.
Frequently asked questions
What is the correct answer to this question?
Acidic
Why is this the correct answer?
Blue litmus turning red is a characteristic test for an acidic solution. A second independent observation supports the same conclusion: acids react with metal carbonates to form a salt, water, and carbon dioxide gas, for example acid + carbonate → salt + H₂O + CO₂. Thus the solution is acidic, making option D correct. A basic or neutral solution would not normally produce this combined indicator pattern.
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.
