Chemistry · Solutions and Colligative Properties

NEET (UG) 2023 — Question 58

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Helium is used to dilute oxygen in diving apparatus.

Reason (R): Helium has high solubility in $\mathrm{O}_{2}$ .

In light of the above statements, choose the most appropriate answer from the options given below:

Option A:
Both (A) and (R) are true and (R) is the correct explanation of (A).
Option B:
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
Option C:
(A) is true but (R) is false.
Correct
Option D:
(A) is false but (R) is true.

Answer: C

Step-by-step solution

Assertion (A) is true: Helium is used to dilute oxygen in diving apparatus because it has very low solubility in blood, which helps prevent nitrogen narcosis and embolism during deep-sea diving.

Reason (R) is false: Helium is not used because of high solubility in oxygen; its importance lies in its low solubility in blood.

Thus, (A) is true but (R) is false.

Answer key and solution verified before publishing.

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Exam: NEET (UG) 2023
Paper: 2023 paper
Subject: Chemistry
Chapter: Solutions and Colligative Properties
Topic: Gas in Liquid Solutions (Henry's Law)