JEE Main 2020ChemistryClassification of Elements and Periodicity in PropertiesEasyMCQ

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

JEE Main 2020 (08 Jan Shift 1)

Question

The third ionization enthalpy is minimum for:

Choose an option

Show full solutionCorrect option: B
Correct answer
BFe

Step-by-step explanation

CO− Ar 3 d 7 4 s 2

Fe− Ar 3 d 6 4 s 2
 
Ni− Ar 3 d 8 4 s 2

Mn− Ar 3 d 5 4 s 1

In Fe third electron will remove from 3d and extra stability will be attained by this so ionisation energy is minimum for Fe.

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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.