When an acid reacts with a metal, which one of the following gas is usually liberated? A. Ammonia Gas B. Chlorine C. Oxygen D. Hydrogen gas 0 0 votes Article Rating Subscribe Login Notify of new follow-up comments new replies to my comments Label {} [+] Name* Email* Label {} [+] Name* Email* 0 Comments Oldest Newest Most Voted Inline Feedbacks View all comments