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Question

The order of first electron affinity of $O, S$ and $S e$ is:
$S > O > S e$
$S e > O > S$
$O > S > S e$
$S > S e > O$

A

S > S e > O

B

S e > O > S

C

O > S > S e

D

S > O > S e

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Solution

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O has an exceptionally smaller value of electron affinity $(- 141 k J m o l^{- 1})$ due to smaller atomic size than sulphur (weaker electron-electron repulsion in 3p-subshell). It is less than Se and Te also.

$S > S e > O$

Thus, Option B is correct.

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