The gas evolved in the reaction of zinc with dilute acid gives a pop sound near a burning splint. Which gas is confirmed?
Answer and explanation
Correct answer: Hydrogen
The governing concept is the reaction of an active metal with a dilute acid. Zinc displaces hydrogen from the acid, for example: Zn + 2HCl → ZnCl₂ + H₂. Hydrogen is combustible and, when tested with a burning splint, burns rapidly with a characteristic pop sound. Carbon dioxide extinguishes a flame, oxygen relights it, and chlorine has different bleaching and toxic properties. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The governing concept is the reaction of an active metal with a dilute acid. Zinc displaces hydrogen from the acid, for example: Zn + 2HCl → ZnCl₂ + H₂. Hydrogen is combustible and, when tested with a burning splint, burns rapidly with a characteristic pop sound. Carbon dioxide extinguishes a flame, oxygen relights it, and chlorine has different bleaching and toxic properties. Therefore, 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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