Which substance will react with an acid to give carbon dioxide instead of hydrogen?
Answer and explanation
Correct answer: Sodium carbonate
The governing distinction is between metal-acid and carbonate-acid reactions. Reactive metals such as zinc, magnesium, and iron generally react with dilute acids to release hydrogen gas. A carbonate reacts with an acid to form a salt, water, and carbon dioxide; for example, Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Therefore, sodium carbonate in option C is correct.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate
Why is this the correct answer?
The governing distinction is between metal-acid and carbonate-acid reactions. Reactive metals such as zinc, magnesium, and iron generally react with dilute acids to release hydrogen gas. A carbonate reacts with an acid to form a salt, water, and carbon dioxide; for example, Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Therefore, sodium carbonate in option C is correct.
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.
