A first row transition metal with the highest | vedclass

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Question

(B) The first row transition metal with the highest enthalpy of atomization is Vanadium $(V)$.Vanadium reacts with oxygen to form oxides like $V_2O_3$

Vedclass · Accepted Answer

$2$

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(B) The first row transition metal with the highest enthalpy of atomization is Vanadium $(V)$.Vanadium reacts with oxygen to form oxides like $V_2O_3$,$V_2O_4$,and $V_2O_5$.Among these,$V_2O_4$ $(VO_2)$ is amphoteric in nature.In $V_2O_4$,the oxidation state of $V$ is $+4$.The electronic configuration of $V^{+4}$ is $[Ar] 3d^1$.It has $1$ unpaired electron $(n=1)$.The 'spin-only' magnetic moment is calculated as $\mu = \sqrt{n(n+2)} = \sqrt{1(1+2)} = \sqrt{3} \approx 1.732 \ BM$.The nearest integer value is $2$ $BM$.

List-$I$ (Transition metal/Compound/complex)	List-$II$ (Catalytic Role)
$A$. $V_2O_5$	$I$. Preparation of ammonia from $N_2/H_2$ mixture
$B$. $Fe$	$II$. Polymerisation of alkynes
$C$. $PdCl_2$	$III$. Preparation of $H_2SO_4$ from $SO_2$
$D$. $Ni$ complex	$IV$. Oxidation of ethyne to ethanal

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