Question

valency of carbonate

Answer 1

Carbonate is formed when Na2CO3 or CaCO3 or similar carbonate compound break-up into ions. Now, (CO3)2- i.e., carbonate ion can exist alone but only through resonance. You can say despite of having 2 valency in oxygen it gets 1.5 valency fulfilled and that's because of resonance.

Answer 2

Valecnce of carbonate is 2 ... We can't say it -2 ..... Because valency can't be in negative ...

So valency will 2 ...