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(B) Dipole moment: $NF_3 (0.24 \ D) < NH_3 (1.47 \ D)$. Statement $A$ is incorrect.$(B)$ $BeH_2$ is $sp$ hybridized and linear, so its dipole moment i

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$B$ & $C$ only

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(B) Dipole moment: $NF_3 (0.24 \ D) $(B)$ $BeH_2$ is $sp$ hybridized and linear, so its dipole moment is $0$. Statement $B$ is correct.$(C)$ Bond order of $O_2^{2-}$ is $\frac{10-8}{2} = 1$. Bond order of $F_2$ is $\frac{8-6}{2} = 1$. Statement $C$ is correct.$(D)$ In $O_3$, the central oxygen atom has a formal charge of $+1$. Statement $D$ is incorrect.$(E)$ In $NO_2$, nitrogen has an odd number of electrons ($7$ valence electrons), so it does not follow the octet rule. Statement $E$ is incorrect.Therefore, only $B$ and $C$ are correct.

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