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MHT CET202519 Apr 2025Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which of the following statements is correct about O ₂ and O ₃ molecule?

Options

  1. AO ₂ and O ₃ are paramagnetic
  2. BThe enthalpy change during the formation of O ₃ from O ₂ is positive
  3. CThe entropy change in the formation of O ₃ from O ₂ is positive
  4. DO ₃ is more stable than O ₂

Correct answer

B. The enthalpy change during the formation of O ₃ from O ₂ is positive

Step-by-step solution

A: O ₂ is paramagnetic due to two unpaired ^* electrons, but O ₃ is diamagnetic with all electrons paired. This statement is incorrect. B: The reaction 3 2 O ₂(g) O ₃(g) is endothermic ( H > 0 ) since ozone is less stable than dioxygen. This statement is correct. C: The entropy change for 3 2 O ₂(g) O ₃(g) is negative ( S D: O ₂ is more stable than O ₃ , which readily decomposes to oxygen. This statement is incorrect. Only statement B is correct. The final answer is B

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