Question

When a bottle of cold drink is opened, the gas comes out with a fizze due to :

• A. decrease in temperature
• B. increase in pressure
• C. decrease in pressure suddenly which results in decrease of solubility of $C{O}_2$ gas in water
• D. none

Answer 1

The correct option is C decrease in pressure suddenly which results in decrease of solubility of $C{O}_2$ gas in water

When the cap of the bottle is removed, the pressure rapidly drops to 1 atmosphere and the liquid is left holding more dissolved gas than the equilibrium amount at this pressure. The liquid is momentarily supersaturated with gas. This gas begins to come out of solution and to form bubbles. It is easy to observe the fact that most bubbles form on the edges of the bottle rather than in the body of the liquid.