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Q.

Which set of elements shows positive electron gain enthalpy?

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a

He, N, O

b

Ne, N, Cl

c

O, Cl, F

d

N, He, Ne

answer is D.

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Detailed Solution

Noble gases like Helium and Neon would be difficult to accommodate an electron.
Therefore, Helium and Neon have positive electron gain enthalpy.

Nitrogen is a group 15 element and shows positive electron gain enthalpy due to half-filled orbital.

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