The electron gain enthalpy (in (kJ)/(mol) ) of fluorine, chlorine, bromine and iodine, respectively, are

JEE Main 20207 JanuaryMorning Shift

Exam: JEE Main
Year: 2020
Date: 7 January
Shift: Morning Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2020 · 7 January · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

The electron gain enthalpy (in (kJ)/(mol) ) of fluorine, chlorine,...

The electron gain enthalpy (in

\dfrac{kJ}{mol}

) of fluorine, chlorine, bromine and iodine, respectively, are

Options

A $- 296, - 325, - 333$ and $- 349$
B $- 349, - 333, - 325$ and $- 296$
C $- 333, - 349, - 325$ and $- 296$
D $- 333, - 325, - 349$ and $- 296$

Correct answer

C. $- 333, - 349, - 325$ and $- 296$

Step-by-step solution

Order of electron gain enthalpy $Cl > F > Br > I$

Electron gain enthalpy of third period elements are greater than second period elements.

Electron gain enthalpy decrease down to the group, but here Electron gain enthalpy of chlorine is greater than fluorine, it is due to small size of fluorine atom, due to which electron density is high than chlorine, hence upcoming electron face high repulsion in $F$ atom, hence the energy released is less than chlorine.

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