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Question

What is the value of Electron gain enthalpy of Na+, if IE1 of Na=5.1 eV .

A
10.2 eV
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B
10.2 eV
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C
5.1 eV
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D
5.1 eV
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Solution

The correct option is C 5.1 eV
Ionistion enthalpy is defined as the energy required to remove an electron from an isolated gasous atom.
Na(g)Na+(g)+e
Electron gain enthalpy is defined as the enthalpy change when an electron is added to isolated gaseous atom.
Na+(g)+eNa(g)
Therefore, the value of electron gain enthalpy of Na+ is equal to ionisation enthalpy of Na in magnitude but not sign.

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