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Question

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

A
Se<S<O
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B
O<Se<S
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C
S<O<Se
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D
S<Se<O
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Solution

The correct option is B O<Se<S
Se,S and O are members of group 16. Now in a group electron affinity decreases down a group. therefore, the electron affinity of S is more than oxygen due to small size of oxygen.

Addition of extra electron to the oxygen causes more inter-electronic repulsion and electron affinity decreases.

Therefore correct order of EA is S>Se>O.

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