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Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements ?

  1. A
  2. B
  3. C
  4. D

Solution & Step-by-step Explanation

1. Halogens (Group 17) have higher (more negative) electron gain enthalpy than Group 16 elements.2. In both groups, the second element ( and ) has a more negative value than the first ( and ) because the small size of the first-row elements leads to high inter-electronic repulsions.Correct order: .

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Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements ?
A
B
C
D

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