NEET 2023
- Exam
- NEET
- Year
- 2023
- Subject
- Chemistry
- Chapter
- Solutions
NEET 2023 · Chemistry · Solutions
Given below are two statements: one is labelled as Assertion A and...
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.
Reasons R: Helium has high solubility in
In the light of the above statements, choose the correct answer from the options given below:
Options
- AA is false but R is true.
- BBoth A and R are true and R is the correct explanation of A.
- CBoth A and R are true and R is NOT the correct explanation of A.
- DA is true but R is false.
Correct answer
D. A is true but R is false.
Step-by-step solution
Air contains a large amount of nitrogen and the solubility of gases in liquids increases with increase in pressure. When sea divers dive deep into the sea, large amount of nitrogen dissolves in their blood. When they come back to the surface, solubility of nitrogen decreases and it separates from the blood and forms small air bubbles. This leads to a dangerous medical condition called bends. Therefore, air in oxygen cylinders used for diving is diluted with helium gas. This is done as He is sparingly less soluble in blood.