MCQ
$R$ is


- A$Sn + HCl$
- ✓$Zn + NH_4Cl$
- C$Pd + H_2$
- D$LiAlH_4$

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Assertion $A$: Helium is used to dilute oxygen in diving apparatus.
Reason $R:$ Helium has high solubility in $O _2$.
In the light of the above statements, choose the correct answer from the options given below