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JEE MainChemistryClassification of Elements and Periodicity in Properties

Consider the following statements regarding the properties of group-17 elements: A. The magnitude of negative electron gain enthalpy of F is less than that of Cl . B. The bond dissociation enthalpy of F ₂ is less than that of Cl ₂ . C. The standard reduction potential of F ₂ is lower than that of Cl ₂ . D. The magnitude of hydration enthalpy of F ⁻ ion is greater than that of Cl ⁻ ion. Choose the correct statements f

Options

  1. AA, B, C and D
  2. BA and D only
  3. CB and D only
  4. DA, B and D only

Correct answer

D. A, B and D only

Step-by-step solution

Statement A is correct: Due to the small size of the F atom and strong interelectronic repulsions in the 2 p subshell, its electron gain enthalpy is less negative than that of Cl . Statement B is correct: The bond dissociation enthalpy of F ₂ is anomalously low due to strong lone pair-lone pair repulsions between the small F atoms. Statement C is incorrect: F ₂ is a stronger oxidizing agent than Cl ₂ , meaning it has a higher standard reduction potential. This is because the low bond dissociation enthalpy of F ₂ an

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