Question

All N-O bond lengths in nitrate ion are of equal length. Explain why.​

Answer 1

If anything, you might predict that NO₃⁻ has one short N-O bond and two long ones. But all N-O bonds in NO₃⁻ are the same length.

You can draw three equivalent Lewis structures for NO₃⁻. Each has an N=O double bond and two N-O single bonds.

The actual structure is none of these. It is a resonance hybrid of them all.

All three bonds have exactly the same length.

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Answer 2

In NO3 ,There are 3 resonance structures.

But a compound cannot exhibit 3 structures at a time. So it exhibits a stable hybrid structure as it given in the attachment above.

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