Which of the following species is planar?

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(A) To determine the geometry,we calculate the hybridization of the central atom:$1$. For $CO_3^{2-}$: The central carbon atom is $sp^2$ hybridized wi

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$CO_3^{2-}$

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(A) To determine the geometry,we calculate the hybridization of the central atom:$1$. For $CO_3^{2-}$: The central carbon atom is $sp^2$ hybridized with no lone pairs,resulting in a trigonal planar geometry.$2$. For $NH_2^-$: The nitrogen atom has $2$ bond pairs and $2$ lone pairs,resulting in $sp^3$ hybridization and a bent ($V$-shaped) geometry.$3$. For $PCl_3$: The phosphorus atom has $3$ bond pairs and $1$ lone pair,resulting in $sp^3$ hybridization and a trigonal pyramidal geometry.Therefore,only $CO_3^{2-}$ is planar.

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