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What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

1. -5.1 eV
2. -10.2 eV
3. +2.55 eV
4. +10.2 eV

Correct answer: -5.1 eV

Solution

The electron gain enthalpy of Na+ is the negative of the ionization energy of Na, as the processes are reverse of each other. Hence, it is -5.1 eV.

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