What happens when chlorine gas vapor combines with tissue water in the bronchial tubes?

When chlorine gas vapor combines with tissue water in the bronchial tubes, it produces hydrochloric acid. This reaction occurs because chlorine gas is highly reactive and when it comes into contact with water, it forms hydrochloric acid as well as hypochlorous acid. The formation of these acids can lead to a significant irritation of the respiratory tract lining, which is harmful to the tissues. While the other options mention various effects of chlorine, the correct choice highlights the chemical reaction that takes place and its implications for respiratory health. Hydrochloric acid is a strong acid that can damage tissues and lead to further complications, reinforcing the seriousness of chlorine exposure in the respiratory system.