How is the gas formed by reaction of an acid with an active metal identified?
Answer and explanation
Correct answer: By a pop sound near a burning splint
An active metal reacts with an acid to form a salt and release hydrogen gas, for example: zinc + hydrochloric acid → zinc chloride + hydrogen. Hydrogen is tested by bringing a burning splint near the collected gas; it burns rapidly with a characteristic ‘pop’ sound. Therefore option B is correct. Limewater milkiness tests carbon dioxide, while turmeric and phenolphthalein indicate alkaline conditions rather than hydrogen.
Frequently asked questions
What is the correct answer to this question?
By 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 release hydrogen gas, for example: zinc + hydrochloric acid → zinc chloride + hydrogen. Hydrogen is tested by bringing a burning splint near the collected gas; it burns rapidly with a characteristic ‘pop’ sound. Therefore option B is correct. Limewater milkiness tests carbon dioxide, while turmeric and phenolphthalein indicate alkaline conditions rather than 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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
