Give the correct order of bond length for co, co2, co3 (carbonate) and why?

[CO3]2-,CO2,CO is the correct order

Reason: Bond order depends on the number of bonds and bond length is inversely proportional to the bond order

Here CO has a triple bond

CO2 has double bond (O=C=O) due to its linear structure with carbon it can have 2 double bond with oxygen

In [CO3]2- the bond lies between single and double bond

hence the bond length order will be as mentioned above

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