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Curve I and II represent formation of sodium chloride either as covalent molecule from neutral isolated atoms of sodium and chlorine or as ionic from isolated gaseous sodium and chloride ions

R = Reference energy set as ‘0’ (for isolated Na & Cl atoms)
What is the absolute electron gain enthalpy of gaseous uni positive sodium ion (per ion in eV), if electron affinity of isolated chlorine atom is $3.62 e V$ ? Give your value to nearest integer

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answer is 5.

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Detailed Solution

I – Covalent
II – ionic
$I E = 3.62 + 1.52 = 5.14$

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