The electron affinities of N, O, S and Cl are :

N < O < S < Cl

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O < N < Cl < S

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O = Cl < N = S

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O < S < Cl < N.

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Solution

The correct option is A
N < O < S < Cl

Chlorine (Cl) being the group 17 element has maximum electron affinity. ‘N’ has zero electron affinity because extra stability is associated with exactly half-filled orbitals. Sulphur has more electron affinity than ‘O’ because the effect of small size of O atom is more than off set by the repulsion of electrons alredy present in 2p-orbitals of O atom.

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