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Question: Answered & Verified by Expert
Assertion : Helium is used in diving apparatus.
Reason : Solubility of helium is less in blood.
Chemistryp Block Elements (Group 15, 16, 17 & 18)AIIMSAIIMS 2011
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1540 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true and reason is the correct explanation of assertion.
A mixture of $2 \% \mathrm{O}_2$ and $98 \%$ He is used in diving apparatus which gives the same partial pressure of $\mathrm{O}_2$ as in normal air at $1 \mathrm{~atm}$. Due to high partial pressure and greater solubility, $\mathrm{N}_2$ gets dissolved in blood and form bubbles (bends or decompression sickness). Hence, $\mathrm{N}_2$ is replaced by helium which is much less soluble in biological fluids.

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