Q.

Arrange S, O and Se in ascending order of electron affinity

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a

Se < S < O

b

O < Se < S

c

S < O < Se

d

S < Se < O

answer is B.

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Detailed Solution

On moving down in the group EA decreases but due to smaller size of oxygen incoming electron experience more repulsion so EA of O is less than S.                   S  >  O  > Se
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