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For electron gain enthalpies of the elements denoted as $Δ_{e g} H$ , the incorrect option is:

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$Δ_{e g} H (S e) < Δ_{e g} H (S)$

$Δ_{e g} H (I) < Δ_{e g} H (A t)$

$Δ_{e g} H (T e) < Δ_{e g} H (P o)$

$Δ_{e g} H (C l) < Δ_{e g} H (F)$

answer is B.

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Detailed Solution

(1) ΔegH (Cl) < ΔegH (F)
(−345) (−328) Correct

(2) ΔegH (Se) < ΔegH (S)
(−195) (−200) Incorrect

(3) ΔegH (I) < ΔegH (At)
(−295) (−270) Correct

(4) ΔegH (Te) < ΔegH (Po)
(−190) (−183) Correct

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