Question
- Account for the following:
- Ozone is thermodynamically unstable.
- Solid $PCl_5$ is ionic in nature.
- Fluorine forms only one oxoacid HOF.
- Draw the structure of
- $BrF_{5.}$
- $XeF_{4.}$

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| Column I | Column II | ||
| $(A)$ | Its partial hydrolysis does not change oxidation state of central atom | $(1)$ | $He$ |
| $(B)$ | It is used in modern diving apparatus | $(2)$ | $XeF_6$ |
| $(C)$ | It is used to provide inert atmosphere for filling electrical bulbs | $(3)$ | $XeF_4$ |
| $(D)$ | Its central atom is in $sp^3d^2$ hybridisation | $(4)$ | $Ar$ |