JAMB - Chemistry (1978 - No. 40)
A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because
pressure inside the gas jar is greater than pressure outside it
the air in the gas jar had been used up by burning
oxygen in the gas jar had been used up by burning
nitrogen in the gas jar had been used up by burning
the temperature in the jar had risen considerably