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JEE Main 202125 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 25 July
Shift: Morning Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2021 · 25 July · Morning Shift · Chemistry · d and f Block Elements

The correct order of following 3d metal oxides, according to their...

The correct order of following $3d$ metal oxides, according to their oxidation numbers is :

(a) ${CrO}_{3}$

(b) ${Fe}_{2}{O}_{3}$

(c) ${MnO}_{2}$

(d) ${V}_{2}{O}_{5}$

(e) ${Cu}_{2}O$

Options

A $( d ) > ( a ) > ( b ) > ( c ) > ( e )$
B $( a ) > ( c ) > ( d ) > ( b ) > ( e )$
C $( a ) > ( d ) > ( c ) > ( b ) > ( e )$
D $( c ) > ( a ) > ( d ) > ( e ) > ( b )$

Correct answer

C. $( a ) > ( d ) > ( c ) > ( b ) > ( e )$

Step-by-step solution

(a) $\overset{+ 6}{Cr}{O}_{3}$

(b) $\overset{+ 3}{Fe}2{O}_{3}$

(c) $\overset{+ 4}{Mn}{O}_{2}$

(d) $\overset{+ 5}{V}2{O}_{5}$

(e) $\overset{+ 1}{Cu}2O$

So order of oxidation state

$a > d > c > b > e$

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