MCQ
Metal cation present in sodium nitro prusside is also present in
- AChlorophyll
- BVitamin $B_{12}$
- CCis-platin
- ✓hemoglobin
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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