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Question
The correct order of electron gain enthalpy is :
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JEE MAINS 2021
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Solution
Electron affinity values for group 16 elements:
O=141 kJ/molS=200 kJ/molSe=195 kJ/molTe=190 kJ/molPo=174 kJ/mol
Correct order of electron gain enthalpy is
S>Se>Te>O
Lesser the electronic repulsion faced by an electron to get occupied in the outermost shell higher the amount of energy released.
On moving down the group, the electron gain enthalpy decreases from S to Po.
Oxygen has an unexpectedly low value of electron gain enthalpy.
Since oxygen is smaller in size than S, so incoming e− on oxygen faces more electronic repulsion due to more e− density as a result electron affinity decreases.
O=141 kJ/molS=200 kJ/molSe=195 kJ/molTe=190 kJ/molPo=174 kJ/mol
Correct order of electron gain enthalpy is
S>Se>Te>O
Lesser the electronic repulsion faced by an electron to get occupied in the outermost shell higher the amount of energy released.
On moving down the group, the electron gain enthalpy decreases from S to Po.
Oxygen has an unexpectedly low value of electron gain enthalpy.
Since oxygen is smaller in size than S, so incoming e− on oxygen faces more electronic repulsion due to more e− density as a result electron affinity decreases.
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