Question

Ionisation enthalpy of an atom is equal to :-
1. Electron gain enthalpy of the cation.
2. Electronegativity of the ion.
3. Ionisation enthalpy of the cation.
4. Electron gain enthalpy of anion.

Answer 1

B.Electronegativity of the ion.


Explanation:

Some amount of energy is required in order to remove an electron from atom which will result in formation of + ion. The equal amount of energy will be released if the same electron is added back to the ion, which will be called electron gain enthalpy of ion.