MCQ
Pick out the complex compound in which the central metal atom obeys $EAN$ rule strictly
- ✓${K_4}[Fe{(CN)_6}]$
- B${K_3}[Fe{(CN)_6}]$
- C$[Cr{({H_2}O)_6}]\,C{l_3}$
- D$[Cu{(N{H_3})_4}]\,S{O_4}$
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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


$\therefore$ reactant $(A)$ is