The impurities formed during the laboratory preparation of chlorine gas are removed by

Explanation: In the laboratory, chlorine is often prepared by reacting concentrated hydrochloric acid with an oxidizing agent such as manganese dioxide:

\(\ce{MnO2 + 4HCl -> MnCl2 + Cl2 + 2H2O}\)

The chlorine gas produced usually contains impurities such as \(\ce{HCl}\) gas and water vapor. To purify it:

• Water (H2O): would not remove acidic impurities, so not correct.
• Ammonia (NH3): would react with chlorine to form chloramines, not for purification.
• Concentrated H2SO4: is used to remove moisture (it’s a drying agent), leaving dry chlorine gas. ✅
• HCl: is itself an impurity, not a purifier.