To avoid the medical condition called 'bends' in scuba divers, the composition of gas filled in the tank is
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Helium 11.7%, Nitrogen 56.2%, Oxygen 32.1%
By Henry’s law, the solubility of a gas in a liquid rises with its partial pressure, so a diver breathing air at high pressure has more nitrogen dissolved in the blood; helium is much less soluble.
NCERT (2026-27 edition):
Solubility of a Gas in a Liquid – …
