An acid reacts with a metal to produce a gas that gives a pop sound near a burning splint. Which gas is it?
Answer and explanation
Correct answer: Hydrogen
The governing reaction is: acid + reactive metal → salt + hydrogen gas. For example, zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen. Hydrogen is combustible and produces the characteristic ‘pop’ when tested with a burning splint, so option A is correct. Carbon dioxide generally extinguishes a flame, while chlorine and ammonia do not give this standard pop test.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The governing reaction is: acid + reactive metal → salt + hydrogen gas. For example, zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen. Hydrogen is combustible and produces the characteristic ‘pop’ when tested with a burning splint, so option A is correct. Carbon dioxide generally extinguishes a flame, while chlorine and ammonia do not give this standard pop 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.
