MCQ
$H_2S$ gas changes a filter paper dipped in lead accetate solution into
- ✓Black
- BRed
- CGreen
- DYellow
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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