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  4. The bond order in CO22- ion between C - O is

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Q. The bond order in $CO_2^{2-}$ ion between $C - O$ is

Chemical Bonding and Molecular Structure

Solution:

We know that carbonate ion has following resonating structures
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Bond order $ = \frac{\text{Total number of bonds between atoms}}{\text{Total number of resonating structure}}$
$ = \frac{1 + 1 + 2}{3} = \frac{4}{3} = 1.33$