MCQ
Among the fluorides below, the one which does not exist is
- A$Xe{F_4}$
- ✓$He{F_4}$
- C$S{F_4}$
- D$C{F_4}$
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$(I)$ $Na_2O_2$
$(II)$ $O_2 [AsF_6]$
$(III)$ $CsO_2$
$(IV)$ $O_2$
$(iii)$ Size $(iv)$ Energy level