Q.

Among halogens, the correct order of amount of energy released in electron gain enthalpy is

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a

F>Cl>Br>I

b

F

c

FBr>I

d

FI

answer is C.

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Detailed Solution

As we move from Cl to I, the electron gain enthalpy (i.e. energy released in electron gain) become less and less negative due to a corresponding increase in the atomic size. However, the electron gain enthalpy of F is less negative than that of Cl due to its small size. Thus, the negative electron gain enthalpy follows the order, F < Cl > Br > l
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