Identify the correct statement.

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(C) $1$. $BF_3$ is a trigonal planar molecule with a symmetric structure,so its net dipole moment is $0$. Thus,option $A$ is incorrect.$2$. In $NH_3$,

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Three canonical forms can be drawn for the $CO_3^{2-}$ ion.

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(C) $1$. $BF_3$ is a trigonal planar molecule with a symmetric structure,so its net dipole moment is $0$. Thus,option $A$ is incorrect.$2$. In $NH_3$,the dipole moments of $N-H$ bonds and the lone pair are in the same direction,leading to a higher dipole moment. In $NF_3$,the dipole moments of $N-F$ bonds are in the opposite direction to the lone pair,resulting in a lower net dipole moment. Thus,$NH_3 > NF_3$. Option $B$ is incorrect.$3$. The carbonate ion $(CO_3^{2-})$ has three equivalent resonance structures (canonical forms) where the double bond is delocalized among the three oxygen atoms. Thus,option $C$ is correct.$4$. Ozone $(O_3)$ has two equivalent resonance structures. Thus,option $D$ is incorrect.

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