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Q.

Which of the following order(s) is/are correct?

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a

O2<F<Na+<Mg2+ increasing Zeffective 

b

Mg2+<Na+<O2<F increasing size

c

O2<F<Na+<Mg2+ increasing ionisation energy.

d

O2<F<Na+<Mg2+ increasing electron affinity

answer is C, D, A.

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Detailed Solution

For the isoelectronic species, the effective nuclear charge is in ascending sequence as follows:

O2<F<Na+<Mg2+− increasing Zeffective 

The effective nuclear charge rises with increasing atomic number for isoelectronic species.

Ionization energy is growing in the following order:

O2<F<Na+<Mg2+

The ionisation energy rises as the effective nuclear charge does.

The order of increasing electron affinities is

O2<F<Na+<Mg2+

The electron affinity increases as the effective nuclear charge rises.

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