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Solution


Q.

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 O2.

In the light of the above statements, choose the correct answer from the options given below.                  [2023]
1 A is true but R is false.  
2 A is false but R is true.  
3 Both A and R are true and R is the correct explanation of A.  
4 Both A and R are true and R is not the correct explanation of A.  

Ans.

(1)

Helium is used as a diluent for oxygen in modern diving apparatus because of its very low solubility in blood.