Dilute sulphuric acid is added to zinc pieces in a test tube. The evolved gas burns with a pop sound near a burning splint. What is the correct chemical reason?
Answer and explanation
Correct answer: Metal reacts with acid to produce hydrogen gas
Zinc is above hydrogen in the reactivity series, so it displaces hydrogen from dilute sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂. The gas evolved is hydrogen, and hydrogen burns rapidly with oxygen in air, producing the characteristic pop sound. Oxygen, nitrogen and chlorine are not products of this metal–acid reaction, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Metal reacts with acid to produce hydrogen gas
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. The gas evolved is hydrogen, and hydrogen burns rapidly with oxygen in air, producing the characteristic pop sound. Oxygen, nitrogen and chlorine are not products of this metal–acid reaction, so option A 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.
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