Chapter 9 Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals - Study Questions - Page 369b: 34

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$CO_2$: 2 $\sigma$ and 2 $\pi$ bonds, C is sp hybridized, the bond angle is 180° and the geometry is linear. Bond order of 2. $CO_3^{2-}$: 3 $\sigma$ and 1 $\pi$ bonds, C is $sp^2$ hybridized, the bond angle is 120° and the geometry is trigonal planar. Bond order of 1.33 due to ressonance.