MCQ
For natural polymers$, \text{PDI}$ is generally $.......$
- A$0$
- ✓$1$
- C$100$
- D$1000$
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$1-2-3$
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