Choose the options having correct order for electron gain enthalpy.

Cl > F > Br > I > Ar

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F > Cl > Br > I > Ar

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Ar > F > I > Br > Cl

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Ar > Cl > Br > I > F

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Solution

The correct option is A Cl > F > Br > I > Ar
$∙$ The electron gain enthalpy of an element is defined as the energy liberated when an electron is added to its neutral gaseous atom. The image given below shows the electron affinity trend across the period and down the group.

$∙$ F (2nd period) has less electron gain enthalpy than Cl (3rd period) because:
- the size of F is very small and compact.
- the electron-electron repulsion in 2p subshell are comparatively large.

$∙$ Argon (Ar) is a noble gas element. The electron gain enthalpy for noble gases is the lowest (positive) as they have completely filled subshells. Energy has to be supplied to add an additional electron in the orbital of next higher shell.

Therefore, correct order for electon gain enthalpy is: Cl > F > Br > I > Ar.

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Similar questions

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy ) is
(a) F > Cl > Br > I (b) F < Cl < Br < I (c) F < Cl > Br > I (d) F < Cl < Br < I

Q. The correct order of polarizability is

I^{-}, B r^{-}, C l^{-}, F^{-}

Q. For the species

(I^{-}, C l^{-}, B r^{-})

, the increasing order of nucleophilicity in water would be:

Q. Which of the following options does not give to the correct trends indicated against it?
(I)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Bond dissociation energy
(II)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Oxidizing nature
(III)

C l > F > B r > I

: Electron gain enthalpy
(IV)

F > C l > B r > I

: Electronegativity

Q. Choose the correct increasing order of reactivity of alkyl halides with zinc and dilute

H C l

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