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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pt164

Select the correct statements about electron gain enthalpy.

  1. ABeryllium has a positive first electron gain enthalpy because of its filled subshell
  2. BNoble gases have negative values since their effective nuclear charge is very high
  3. CThe second electron gain enthalpy of is positive
  4. DThe small subshell of fluorine causes strong inter-electronic repulsion, reducing its value below that of chlorine

Answer: A, C, D

F: compact 2p. Be: filled 2s forces the electron into 2p. plus an electron: charge repulsion makes it positive. Noble gases have positive values because the electron must go into a new shell, not because of Zeff, so the last is false.
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