In which experiment is the milky appearance of lime water the most useful test?
Answer and explanation
Correct answer: Identification of carbon dioxide gas
The limewater test is based on the reaction of carbon dioxide with calcium hydroxide. When CO2 is passed through limewater, insoluble calcium carbonate forms: CO2 + Ca(OH)2 → CaCO3 + H2O. The suspended calcium carbonate makes the solution milky, so option C is correct. Hydrogen is tested with a pop sound, oxygen relights a glowing splint, and chlorine has different characteristic tests.
Frequently asked questions
What is the correct answer to this question?
Identification of carbon dioxide gas
Why is this the correct answer?
The limewater test is based on the reaction of carbon dioxide with calcium hydroxide. When CO2 is passed through limewater, insoluble calcium carbonate forms: CO2 + Ca(OH)2 → CaCO3 + H2O. The suspended calcium carbonate makes the solution milky, so option C is correct. Hydrogen is tested with a pop sound, oxygen relights a glowing splint, and chlorine has different characteristic tests.
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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