Multiple choice general knowledge science & technology

Fizziness in Coco-Cola/Pepsi is caused by

  1. helium

  2. hydrogen

  3. oxygen

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbon dioxide dissolved under pressure creates the fizziness in carbonated drinks like Coke and Pepsi. When the bottle is opened, pressure decreases and CO2 comes out of solution as bubbles. Helium and hydrogen are much lighter gases that would escape, while oxygen doesn't create the characteristic fizz.

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