JEE Main 2020Chemistryd and f Block ElementsEasyMCQ

JEE Main 2020 — d and f Block Elements Question with Solution

JEE Main 2020 (09 Jan Shift 1)

Question

The electronic configurations of bivalent europium and trivalent cerium are:
(atomic number: Xe=54 , Ce=58 , Eu=63)

Choose an option

Show full solutionCorrect option: B
Correct answer
BXe4f7 and Xe4f1

Step-by-step explanation

Electronic configuration of Ce and Eu in ground state are following:

Ce=Xe 4f1 5d1 6s2Eu=Xe 4f7 6s2

Trivalent cerium means cerium loss three electrons and obtain +3 charge and bivalent Europium means Europium loss two electrons and obtain +2 charge, so their electronic configurations are following

Eu2+:Xe4f7


Ce3+:Xe4f1

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About this question

This is a previous-year question from JEE Main 2020, 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.