When zinc metal reacts with dilute sulphuric acid, which test is most suitable to identify the evolved gas?
Answer and explanation
Correct answer: Pop sound near a burning splint
Zinc reacts with dilute sulphuric acid according to Zn + H₂SO₄ → ZnSO₄ + H₂. The evolved gas is hydrogen. When a burning splint is brought near hydrogen, it burns rapidly with a characteristic ‘pop’ sound, so option A is the suitable identification test. Limewater turning milky identifies carbon dioxide, while litmus colour changes test acidity or basicity rather than confirming hydrogen.
Frequently asked questions
What is the correct answer to this question?
Pop sound near a burning splint
Why is this the correct answer?
Zinc reacts with dilute sulphuric acid according to Zn + H₂SO₄ → ZnSO₄ + H₂. The evolved gas is hydrogen. When a burning splint is brought near hydrogen, it burns rapidly with a characteristic ‘pop’ sound, so option A is the suitable identification test. Limewater turning milky identifies carbon dioxide, while litmus colour changes test acidity or basicity rather than confirming hydrogen.
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.
