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Q.

Which of the following has the least first electron affinity'?

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a

S

b

O

c

Cl

d

F

answer is A.

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Detailed Solution

The electron affinity for oxygen is lowest. As we move from left to right in a period, electron affinity becomes more negative. Argon (a noble gas) has large positive value for electron affinity.

Hence, the option A is correct.

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