What is the value of electron gain enthalpy of $N a^{+}$ if $I E_{1}$ of $N a$ is $5.1 eV$ ?

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-10.2 eV

-5.1 eV

+2.55 eV

+ 10.2 eV

answer is B.

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Detailed Solution

The electron gain enthalpy of sodium cation is equal in magnitude and opposite in sign to the first ionization energy of sodium atom. It is equal to −5.1 eV.

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