Chemistrymedium · Past Paper
In the laboratory preparation of carbon dioxide, why is it collected by upward displacement of air?
AIt is lighter than air
BIt is heavier than air
CIt is insoluble in water
DIt reacts with water
✓ Correct Answer: B — It is heavier than air
Carbon dioxide has a molar mass of 44 g/mol compared to the average 29 g/mol for air, making it denser and allowing it to displace air upwards.
Share this question
More from Chemistry
- An element has 2 electrons in the K shell, 8 in the L shell, and 3 in the M shell. Identify the element.
- What is the change in oxidation number of Nitrogen in the reaction: N2 + 3H2 -> 2NH3?
- Which gas is evolved when a metal reacts with a base?
- What happens when Copper is heated in air?
- How many protons are there in an atom of Magnesium?