In this type of questions, a statement of assertion is fol…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Assertion Reason Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

In this type of questions, a statement of assertion is followed by a statement of reason

(R). Mark the correct choice as:

Assertion : Helium is used in diving apparatus.

Reason : Solubility of helium is less in blood.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct answer is:

A mixture of oxygen and helium is used in diving apparatus which gives the same partial pressure of as in normal air at 1 atm . Due to high partial pressure and greater solubility, gets dissolved in blood and form bubbles (bends or decompression sickness). Hence, is replaced by helium which is much less soluble in biological fluids

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