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Which of the following ions has resonating structures?A. `SO_4^(2-)`B. `PO_4^(3-)`C. `SO_3^(2-)`D. All of these

Answer» Correct Answer - D
First we write their Lewis structures:
`:underset(..)overset(-..)O-underset( :O: )underset(||)overset( :O: )overset(||)S-underset(..)overset(..-)O:" ":underset(..)overset(-..)O-underset( :O: )underset(||)overset( :O: )overset(||)P-underset(..)overset(..-)O:" " :underset(..)overset(..)O-overset( :O: )overset(||)S-underset(..)overset(..)O:`
In each of these ions, there is more than one reasonable location for a multiple bond. Hence, no single Lewis structure can describe any of these ions. More than one resonance structure must be written for an accurate description.


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