In which situation is hydrogen gas most likely to be formed?
Answer and explanation
Correct answer: Adding dilute sulphuric acid to zinc
Zinc is above hydrogen in the reactivity series, so it displaces hydrogen from dilute sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂. Hence option A is correct. An acid reacting with sodium carbonate releases carbon dioxide, not hydrogen. Carbon dioxide passed into limewater forms calcium carbonate, while heating copper sulphate does not produce hydrogen gas. The type of acid and the metal’s reactivity are decisive.
Frequently asked questions
What is the correct answer to this question?
Adding dilute sulphuric acid to zinc
Why is this the correct answer?
Zinc is above hydrogen in the reactivity series, so it displaces hydrogen from dilute sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂. Hence option A is correct. An acid reacting with sodium carbonate releases carbon dioxide, not hydrogen. Carbon dioxide passed into limewater forms calcium carbonate, while heating copper sulphate does not produce hydrogen gas. The type of acid and the metal’s reactivity are decisive.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Metals and Non-metals.
