Which of the following is not correct?
- A$XeO_3$ has four $\sigma$ and four $\pi$ bonds.
- B$Xe$ in $XeO_4$ is $sp^3d^2$ hybridized.
- CAmong noble gases,$Argon$ is the most abundant in air (by weight).
- DLiquid helium is used in cryogenic fluids.
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