In an experiment both hydrogen gas and carbon dioxide gas may form. What are the correct tests to identify them?
Answer and explanation
Correct answer: Pop sound for hydrogen and lime water for carbon dioxide
The governing concept is the use of characteristic gas tests. Hydrogen burns rapidly and produces a ‘pop’ when a burning splint is brought near the gas. Carbon dioxide does not give that test; it turns limewater milky because calcium carbonate forms. Thus option A correctly pairs each gas with its diagnostic test. Smell and colour are unreliable here, and reversing the tests gives option B, which is incorrect.
Frequently asked questions
What is the correct answer to this question?
Pop sound for hydrogen and lime water for carbon dioxide
Why is this the correct answer?
The governing concept is the use of characteristic gas tests. Hydrogen burns rapidly and produces a ‘pop’ when a burning splint is brought near the gas. Carbon dioxide does not give that test; it turns limewater milky because calcium carbonate forms. Thus option A correctly pairs each gas with its diagnostic test. Smell and colour are unreliable here, and reversing the tests gives option B, which is incorrect.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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