A student says carbonates give hydrogen gas with acids. What is the correct correction?
Answer and explanation
Correct answer: Carbonates give carbon dioxide with acids
The governing reaction pattern is acid plus carbonate, which produces a salt, water, and carbon dioxide: carbonate + acid → salt + water + CO₂. Hydrogen is commonly released when a suitable active metal reacts with a dilute acid, not when a carbonate reacts. Carbon dioxide can be confirmed because it turns limewater milky. Thus option A correctly replaces the student’s statement; chlorine and oxygen are not products of this reaction, and option D wrongly denies gas evolution.
Frequently asked questions
What is the correct answer to this question?
Carbonates give carbon dioxide with acids
Why is this the correct answer?
The governing reaction pattern is acid plus carbonate, which produces a salt, water, and carbon dioxide: carbonate + acid → salt + water + CO₂. Hydrogen is commonly released when a suitable active metal reacts with a dilute acid, not when a carbonate reacts. Carbon dioxide can be confirmed because it turns limewater milky. Thus option A correctly replaces the student’s statement; chlorine and oxygen are not products of this reaction, and option D wrongly denies gas evolution.
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.
