The gas obtained from an acid-metal reaction gives a pop sound near a burning splint. What is the conclusion of this test?
Answer and explanation
Correct answer: The gas is hydrogen
An active metal reacting with a dilute acid commonly produces a salt and hydrogen gas, for example Zn + 2HCl → ZnCl₂ + H₂. Hydrogen is combustible and, when brought near a burning splint, burns rapidly with the characteristic ‘pop’ sound. Therefore option A is the correct conclusion. Carbon dioxide extinguishes a flame, while chlorine and nitrogen do not give this standard pop test for hydrogen.
Frequently asked questions
What is the correct answer to this question?
The gas is hydrogen
Why is this the correct answer?
An active metal reacting with a dilute acid commonly produces a salt and hydrogen gas, for example Zn + 2HCl → ZnCl₂ + H₂. Hydrogen is combustible and, when brought near a burning splint, burns rapidly with the characteristic ‘pop’ sound. Therefore option A is the correct conclusion. Carbon dioxide extinguishes a flame, while chlorine and nitrogen do not give this standard pop test for 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.
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