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NEETChemistryClassification of Elements and Periodicity in Properties

Consider the following statements regarding the properties of fluorine and chlorine: Statement I: The negative electron gain enthalpy of Cl is higher than that of F . Statement II: The electronegativity of Cl is higher than that of F . Statement III: The bond dissociation enthalpy of Cl ₂ is higher than that of F ₂ . Statement IV: The first ionization enthalpy of F is higher than that of Cl . How many of the above st

Options

  1. AOnly one
  2. BOnly two
  3. CAll four
  4. DOnly three

Correct answer

D. Only three

Step-by-step solution

Statement I is correct: The negative electron gain enthalpy of Cl is higher than that of F due to the small size of the F atom, which leads to strong interelectronic repulsions in the compact 2p subshell. Statement II is incorrect: Electronegativity strictly decreases down the group. F is the most electronegative element in the periodic table, so its electronegativity is higher than that of Cl . Statement III is correct: The bond dissociation enthalpy of F ₂ is anomalously lower than that of Cl ₂ because of the lar

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