A gas that is collected by upward delivery is likely to be
Answer Details
A gas that is collected by upward delivery is likely to be lighter than air. This is because upward delivery involves collecting the gas in an inverted container with its open end downwards in a trough filled with water. The gas being collected is less dense than air, and thus it rises upwards and displaces the air in the container, eventually filling it up. The principle of this method is based on the fact that gases with lower density rise upwards, and gases with higher density sink downwards. Therefore, the correct option is that the gas is lighter than air.