JEE Main 2020ChemistryClassification of Elements and Periodicity in PropertiesMediumMCQ

JEE Main 2020 — Classification of Elements and Periodicity in Properties Question with Solution

JEE Main 2020 (07 Jan Shift 1)

Question

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

Choose an option

Show full solutionCorrect option: C
Correct answer
C-333,-349,-325 and -296

Step-by-step explanation

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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About this question

This is a previous-year question from JEE Main 2020, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.