JEE Main 2022Chemistryd and f Block ElementsMediumNumerical

JEE Main 2022d and f Block Elements Question with Solution

JEE Main 2022 (27 Jun Shift 1)

Question

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is B.M.___(Nearest Integer)

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Show full solutionCorrect answer: 6
Correct answer
6

Step-by-step explanation

2KMnO4+5H2C2O4+3H2SO4K2SO4+2MnSO4+10CO2+8H2O

In acidic medium, Mn7+ gets reduced to Mn2+ 

Mn (II) =Ar3d5

Number of unpaired electron in Mn2+=5

μ=nn+2 B.M

μ=55+2 B.M

μ=5.9 B.M

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About this question

This is a previous-year question from JEE Main 2022, 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.