MCQ
Element of atomic number $23$ is placed in the periodic table in
- A$s$ - block
- B$p$ -block
- ✓$d$ - block
- D$f $- block
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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
