In the formation of a chloride ion from an isolated gaseous chlorine atom, 3.8 eV energy is released, which would be equal to:
A
electron affinity of Cl−
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B
ionisation potential of Cl
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C
electronegativity of Cl
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D
ionisation potential of Cl−
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Solution
The correct option is C ionisation potential of Cl− In the formation of a chloride ion from an isolated gaseous chlorine atom, 3.8 eV energy is released which would be equal to Ionisation potential of Cl−. The electron affinity or electron gain enthalpy of the chlorine atom is equal in magnitude and opposite in sign to the ionization potential of chloride ion.