Which of the following gases is present under pressure in soft drinks?
(1) Oxygen
(2) Nitrogen
(3) Carbon dioxide
(4) Nitrous oxide
Answer: (3) Carbon dioxide is present under pressure in soft drinks. Carbon dioxide adds that special sparkle and bite to the beverage and also acts as a mild preservative. Carbon dioxide is a uniquely suitable gas for soft drinks because it is inert, non-toxic, and relatively inexpensive, and easy to liquefy.
