Which test identifies the gas released when an acid reacts with an active metal?
Answer and explanation
Correct answer: A pop sound near a burning splint
An active metal reacts with an acid to form a salt and hydrogen gas: metal + acid → salt + H₂. When a burning splint is brought near hydrogen, the gas burns rapidly and produces the characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while the other tests do not identify hydrogen. Therefore option A is correct.
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What is the correct answer to this question?
A pop sound near a burning splint
Why is this the correct answer?
An active metal reacts with an acid to form a salt and hydrogen gas: metal + acid → salt + H₂. When a burning splint is brought near hydrogen, the gas burns rapidly and produces the characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while the other tests do not identify hydrogen. 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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