A gas released in the reaction of a metal with an acid gives a pop sound near a burning splint. Which gas is it?
Answer and explanation
Correct answer: Hydrogen
The relevant gas-identification principle is the pop test. Metals that are above hydrogen in the reactivity series generally react with dilute acids to form a salt and hydrogen gas, for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen burns rapidly and produces a characteristic pop near a burning splint. Carbon dioxide extinguishes a flame, oxygen relights it, and chlorine has different tests. Thus option C is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The relevant gas-identification principle is the pop test. Metals that are above hydrogen in the reactivity series generally react with dilute acids to form a salt and hydrogen gas, for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen burns rapidly and produces a characteristic pop near a burning splint. Carbon dioxide extinguishes a flame, oxygen relights it, and chlorine has different tests. Thus option C 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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