JEE Main 2021Chemistryd and f Block ElementsMediumMCQ

JEE Main 2021 — d and f Block Elements Question with Solution

JEE Main 2021 (01 Sep Shift 2)

Question

Identify the element for which electronic configuration in +3 oxidation state is [Ar]3 d5:

Choose an option

Show full solutionCorrect option: D
Correct answer
DFe

Step-by-step explanation

Fe263+=3 d54 s0

27Co3+=3 d64 s0

Cr243+=3 d34 s0

25Mn3+=3 d44 s0

M+3=[18Ar]3 d54 s0

M=Ar183 d64 s2

so Z for M=26 and M is Fe.

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About this question

This is a previous-year question from JEE Main 2021, covering the d and f Block Elements 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.