Which test is correct to confirm the gas released in the reaction of an acid with an active metal?
Answer and explanation
Correct answer: A pop sound near a burning splint
An active metal reacting with a dilute acid generally produces hydrogen gas and a salt: metal + acid → salt + H₂. Hydrogen is combustible and, when a small sample is brought carefully near a burning splint, it burns with a characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while turmeric and phenolphthalein are indicators rather than confirmation tests for hydrogen. Hence option B is correct.
Frequently asked questions
What is the correct answer to this question?
A pop sound near a burning splint
Why is this the correct answer?
An active metal reacting with a dilute acid generally produces hydrogen gas and a salt: metal + acid → salt + H₂. Hydrogen is combustible and, when a small sample is brought carefully near a burning splint, it burns with a characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while turmeric and phenolphthalein are indicators rather than confirmation tests for hydrogen. Hence option B 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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