Among CrO,Cr_2O_3,and CrO_3,the sum of spin-o | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) $CrO$ is a basic oxide.$Cr_2O_3$ is an amphoteric oxide.In $CrO$,$Cr$ is in the $+2$ oxidation state $([Ar] 3d^4)$,so it has $4$ unpaired electron

Vedclass · Accepted Answer

$877$

Vedclass · Answer

(A) $CrO$ is a basic oxide.$Cr_2O_3$ is an amphoteric oxide.In $CrO$,$Cr$ is in the $+2$ oxidation state $([Ar] 3d^4)$,so it has $4$ unpaired electrons. The spin-only magnetic moment $\mu = \sqrt{n(n+2)} = \sqrt{4(4+2)} = \sqrt{24} \approx 4.90 \ BM$.In $Cr_2O_3$,$Cr$ is in the $+3$ oxidation state $([Ar] 3d^3)$,so it has $3$ unpaired electrons. The spin-only magnetic moment $\mu = \sqrt{3(3+2)} = \sqrt{15} \approx 3.87 \ BM$.The sum of the spin-only magnetic moments is $4.90 + 3.87 = 8.77 \ BM$.Expressed as $10^{-2} \ BM$,this is $877 	imes 10^{-2} \ BM$.

List-$I$	List-$II$
$A$. $Co^{2+}$	$I$. Yellow colour
$B$. $Fe^{2+}$	$II$. Dark green colour
$C$. $Ni^{2+}$	$III$. Blue colour
$D$. $Cu^{2+}$	$IV$. Pale green colour
	$V$. Pink colour

Among $CrO$,$Cr_2O_3$,and $CrO_3$,the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \ BM$ (nearest integer).
(Given atomic number of $Cr$ is $24$)

Similar Questions

Generally,metal ions and their salts are coloured due to the presence of unpaired electrons in the metal ions. Which of the following compounds is coloured?

Which product is formed by the reaction of an acidic solution of chromic acid with hydrogen peroxide?

Match the following:
List-$I$ List-$II$
$A$. $Co^{2+}$ $I$. Yellow colour
$B$. $Fe^{2+}$ $II$. Dark green colour
$C$. $Ni^{2+}$ $III$. Blue colour
$D$. $Cu^{2+}$ $IV$. Pale green colour
$V$. Pink colour

The correct answer is

Identify the statement which is not correct regarding copper$(II)$ sulphate.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Among $CrO$,$Cr_2O_3$,and $CrO_3$,the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \ BM$ (nearest integer).(Given atomic number of $Cr$ is $24$)