In the structure of HNO_(3) molecule, N-O bond (121 pm) is shorter than N-OH bond (140 pm).

In the structure of HNO_(3) molecule, N-O bond (121 pm) is shorter tha

1.	In the structure of HNO_(3) molecule, N-O bond (121 pm) is shorter than N-OH bond (140 pm).
Answer» Solution :`HNO_(3)` is a resonance HYBRID of the following TWO canonical structures : Due to resonance N-O BOND has some DOUBLE bond character. In contrast, N-OH has only pure single bond character. Since single bonds are longer than double bonds, therefore, N-OH bond is longer (140 pm) than N-O bond (121 pm) in `HNO_(3)`.