What test is used to confirm the presence of carbon dioxide gas in a school laboratory experiment?
Answer and explanation
Correct answer: D. It turns clear limewater (calcium hydroxide) milky or cloudy
- Step 1: Carbon dioxide reacts with limewater [Ca(OH)2] to form an insoluble white precipitate of calcium carbonate (CaCO3). Step 2. This precipitate gives limewater a characteristic milky appearance. Answer: It turns clear limewater (calcium hydroxide) milky or cloudy. Why not the others: Relighting a glowing splint confirms oxygen; burning with a pop sound confirms hydrogen; turning red litmus blue indicates ammonia or bases.
Practise more Living Things and Life Processes.
Free questions with an explanation for every one, and full timed Basic Education Certificate Examination mock tests.
More Living Things and Life Processes questions
- Which cellular organelle is responsible for generating aerobic chemical energy (ATP) in eukaryotic cells?
- Which of the following cellular structures is present in plant cells but strictly absent in animal cells?
- What is the primary green pigment in plant leaves that absorbs sunlight for photosynthesis?
- Which gas is released into the atmosphere as a major byproduct of the light reaction of photosynthesis?
- By which physical process do water molecules move across a selectively permeable membrane from higher to lower water potential?
- What is the basic functional filtering unit of the human kidney responsible for producing urine?