Carbonates and hydrogen carbonates both react with acids to give which common gas?
Answer and explanation
Correct answer: Carbon dioxide
The governing reaction is the acid–carbonate reaction. An acid first forms carbonic acid from carbonate or hydrogen carbonate ions; unstable carbonic acid then decomposes into carbon dioxide and water. For example, carbonate + acid gives salt + water + CO2, while hydrogen carbonate follows the same overall pattern. Therefore carbon dioxide is the common gas. Hydrogen is associated with many metal–acid reactions, not this characteristic test.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
The governing reaction is the acid–carbonate reaction. An acid first forms carbonic acid from carbonate or hydrogen carbonate ions; unstable carbonic acid then decomposes into carbon dioxide and water. For example, carbonate + acid gives salt + water + CO2, while hydrogen carbonate follows the same overall pattern. Therefore carbon dioxide is the common gas. Hydrogen is associated with many metal–acid reactions, not this characteristic test.
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.
