a) The gas collected from charcoal is the carbon gas.
1) Carbon gas was collected in a test tube.
2) A few drops of water was added to the test tube.
3) Then the test tube was covered and was shaken well.
4) Now the solution was tested with blue litmus.
It was observed that the blue litmus paper turns blue into red.
This indicates that the product formed during the reaction was acidic in nature.
b) Charcoal reacts with oxygen to form carbon dioxide gas.
C is the carbon gas obtained from charcoal.
O2 is a dioxygen molecule obtained from water.
CO2 is the carbondioxide gas that is formed from the reaction.