Q.

The first ionization potential of Na is 5.1 V. The value of electron gain enthalpy of Na+ will be:

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a

−5.1eV

b

-10.2eV

c

+2.55eV

d

−2.55eV

answer is A.

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Detailed Solution

We know that: Electron gain enthalpy =− Inonisation potential ∴ Electron gain enthalpy =−5.1eV.
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The first ionization potential of Na is 5.1 V. The value of electron gain enthalpy of Na+ will be: