MCQ
In the following graphs, which graph $(s)$ belong to first order


- ✓$(i),\,(iii)$
- B$(i),\,(ii),\,(iii)$
- C$(i)$ only
- D$(iii),\, (ii)$

$log\frac {a}{a-x}=\frac {kt}{2.303}$
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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