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

- 5.1 e V

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- 10.2 e V

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+ 2.55 e V

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+ 10.2 e V

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Solution

The correct option is A $- 5.1 e V$
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 $- 5.1 e V$ .

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N a^{+}

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The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of $N a^{+}$ will be

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