In which of the following arrangements the order which is correct according to the property indicated against it.

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$Li < Na < K < Rb$ : lncreasing metallic radius

$B < C < N < O$ : Increasing first ionisation enthalpy

${Al}^{+ 3} < {Mg}^{+ 2} < {Na}^{+} < F^{-}$ : Increasing ionic size

$I < Br < F < Cl$ : Increasing electron gain enthalpy (magnitude only)

answer is A, C, D.

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Detailed Solution

The charge that a species has has an inverse relationship with its atomic size in isoelectronic species.
The size increases as the - ve charge increases for isoelectronic species.

${Al}^{+ 3}$ follows ${Mg}^{+ 2}$ , followed by Na +, F, and then, in sequence of increasing size, ${Al}^{3 +}$ .Despite the group's lower electron affinities, Cl has a higher value than F.

The sequence of electron affinities is $I < Br < F < Cl$

As the nucleus receives more and more shells, the radius increases down the group.

$Li < Na < K < Rb$ are the increasing metallic radius in sequence.

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