Question

Reason for forming gas bubbles when a coke bottle is opened.

• A. Increase in pressure
• B. Decrease in pressure
• C. Coke reacts with gases in air
• D. None of these

Answer 1

The correct option is B Decrease in pressure

We are going to apply Henry’s law here. Henry’s law states that by increasing pressure on liquids, solubility of gases increases. To make the drinks really fizzy manufactures add $C{O}_2$ which is only possible when there is lot pressure in the bottle. When we open the bottle the pressure decreases to normal atmospheric pressure which decreases the solubility of $C{O}_2$ . So the gas evolves from the drink forming bubbles.