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  2. Which of the following pairs of elements have lower first ionization enthalpy ? (a) Cl or F ; (b) Cl or S ; (c) K or Ar ; (d)Kr or Xe.
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Which of the following pairs of elements have lower first ionization enthalpy ? (a) Cl or F ; (b) Cl or S ; (c) K or Ar ; (d)Kr or Xe.

Answers (1)
S Sumit

The ionization energy of Cl will be lower than F

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