Which of the following pairs of gases cannot be collected by downward delivery?
- ASO\(_2\) and NH\(_3\)
- BCO and N\(_2\)
- CCl\(_2\) and N\(_2\)
- DSO\(_2\) and N\(_2\)
Explanation
Downward delivery (upward displacement of air) is used for gases that are denser than air (molar mass > 28.8 g/mol). Both CO (28 g/mol) and N2 (28 g/mol) have densities very close to that of air, so they cannot be collected by downward delivery; instead, they are usually collected over water.
Related questions
More chemistry practice around this topic.
Nickel is used in the hydrogenation of alkenes because it
WAEC 2025
Aluminum is extracted by
WAEC 2025
Which of the following gases is used in fire extinguishers?
WAEC 2025
Both Na\(^+\) and K\(^+\) have
WAEC 2025
If a gas occupies a volume of 400cm\(^3\) at a temperature of 400K and a pressure of 1 atm, at what temperature and pressure would its volume be 200cm\(^3\)?
WAEC 2025
The nucleus of a hydrogen atom consists of
WAEC 2025