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Helium is used to dilute oxygen in diving apparatus.
Reason: Helium has high solubility in $O_2$
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Explanation
Helium is used because of its very low solubility in blood.
Detailed Solution
Helium is used as a diluent for oxygen in modern diving apparatus because of its very low solubility in blood.