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Q.

The electronic configuration with the highest ionisation enthalpy is

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a

[Ar]3 d24 s24p3

b

[Ne]3 s23p3

c

[Ne]3 s23p1

d

[Ne]3 s23p2

answer is C.

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Detailed Solution

The electronic configuration with the highest ionisation enthalpy is [Ne]3 s23p3 . On moving down the group, the ionisation enthalpy decreases. In a period, on moving from left to right, the ionisation enthalpy increases.

Hence, the required option is C.

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