JAMB - Chemistry (2011 - No. 28)
The impurities formed during the laboratory preparation of chlorine gas are removed by
H2O
NH3
H2SO4
HCl
Vysvetlenie
Impurities formed during the laboratory preparation of chlorine gas, particularly water vapor, can be removed by passing the gas through concentrated sulfuric acid (H\(_2\)SO\(_4\)). H\(_2\)SO\(_4\) acts as a drying agent, absorbing water and leaving behind a more pure chlorine gas.