Q.

The observed O - O bond length in ozone molecule is

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a

121 pm

b

148 pm

c

128 pm

d

None of these

answer is C.

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Detailed Solution

The normal (expected) bond lengths of O - O (single) and O = O (double) bond are 148 and l2l pm, respectively. However, the observed/calculated bond length is 128 pm due to resonance. Thus, the O- O bonds in O3 molecule are intermediate between a single and a double bond.
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