Which of the following statements is true?
- AHybridisation of the central atom in $NH_3$ is $sp^2$
- B$BeCl_2$ has $V$ shape while $SO_2$ is linear
- C$SF_6$ is octahedral and $F-S-F$ bond angle is $90^{\circ}$
- D$CO_2$ has dipole moment
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