Concept:Concentrated
H2SO4 is a very effective drying agent because it absorbs water vapour.
Explanation:The gas produced in the setup is chlorine gas.
This gas often contains water vapour and hydrogen chloride gas as impurities.
The hydrogen chloride gas is first removed by passing the gas through water.
The remaining water vapour is then removed by passing the gas through concentrated sulphuric acid.
So, in the diagram, concentrated
H2SO4 removes moisture from the gas.
Hence, its function is to dry the gas.
Answer:B. dry the gas.
