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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