Explain the important aspects of resonance with reference to the 
ion.
In some molecules single Lewis structure fails to explain all the characteristics of the molecule. As a result a number of structures can be drawn to explain all the characteristic .Such structures are called resonating structures & resonance is defined as the phenomenon as a result of which a molecule can be expressed in different forms none of which can explain all the properties of the molecule. As in case of 
ion all the C---- O bonds are equivalent. Therefore it is not correct to represent ion through one Lewis strucuture. Instead three resonating structures can be drawn ,which are as follows:
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