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With in each pair of elements of F and Cl.S and Se, and Li  and Na. respectively. the elements that release more energy upon an electron gain are 

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a
F. Se and Na
b
F. S and Li
c
Cl. S and Li
d
Cl. Se and Na

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detailed solution

Correct option is C

(i) Electron affinity of second period p-block elements is less than third period p-block element due to small size of second period p-block element.    E.A. order : FSe                        Li>Na.

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Order of electron affinity of F, Cl, Brand I is


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