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MHT CET202613 April 2026Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

What is O-O bond length in ozone ?

Options

  1. A178 pm
  2. B128 pm
  3. C256 pm
  4. D483 pm

Correct answer

B. 128 pm

Step-by-step solution

Ozone ( O₃ ) is a resonance hybrid of two equivalent structures. Due to resonance, both O-O bonds in the ozone molecule are identical. The O-O bond length is intermediate between a typical O-O single bond ( 148 pm) and an O=O double bond ( 121 pm). The experimentally determined O-O bond length in ozone is 128 pm. Answer: 128 pm

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