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  4. Which pair represents incorrect first IE?

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Q. Which pair represents incorrect first IE?

ManipalManipal 2014

Solution:

The pair $He > He ^{+}$represents incorrect first IE.
The pair $He < He ^{+}$represents correct first IE.
The pair $He , He ^{+}$corresponds to first and second ionisation energies of $He$.
It is difficult to remove an electron from cation than from neutral atom. Hence, second ionisation energy of $He$ is higher than first ionisation energy of $He$.
$IE _{2}> IE _{1}$