A student says carbonates give hydrogen 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 producing salt, water and carbon dioxide: carbonate + acid → salt + H₂O + CO₂. For example, sodium carbonate reacting with hydrochloric acid releases CO₂, not hydrogen. The gas can turn limewater milky, providing a useful confirmation. Hydrogen is associated with many acid–active-metal reactions, so option A correctly fixes the student’s misconception; B, C and D do not fit the reaction.
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 producing salt, water and carbon dioxide: carbonate + acid → salt + H₂O + CO₂. For example, sodium carbonate reacting with hydrochloric acid releases CO₂, not hydrogen. The gas can turn limewater milky, providing a useful confirmation. Hydrogen is associated with many acid–active-metal reactions, so option A correctly fixes the student’s misconception; B, C and D do not fit the 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.
