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How many of the following species have exactly four equally contributing resonance structures? ClO ₄⁻, PO ₄³⁻, XeO ₆⁴⁻, oxalate : COO _ COO ⁻ ⁻, CH ₃- COO ⁻, SF ₄, ~N ₃⁻, HCO ₃⁻

Correct answer

3

Step-by-step solution

4 structures each :

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