The transition metal used as a catalyst is

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(D) Transition metals are widely used as catalysts due to their ability to adopt multiple oxidation states and provide a large surface area for adsorp

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$All$ of these

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(D) Transition metals are widely used as catalysts due to their ability to adopt multiple oxidation states and provide a large surface area for adsorption.$Nickel$ $(Ni)$ is used in hydrogenation reactions.$Platinum$ $(Pt)$ is used in the contact process and various oxidation reactions.$Cobalt$ $(Co)$ is used in the hydroformylation of alkenes.Therefore,all three metals are used as catalysts.

List-$I$	List-$II$
$A$. Oxidation state of $V$ in $VOCl_2$	$I$. $0$
$B$. Number of unpaired electrons in $MnO_4^{2-}$ ion	$II$. $1$
$C$. Number of unpaired electrons in $[NiCl_4]^{2-}$ ion	$III$. $5$
$D$. This oxidation state is exhibited by all lanthanide ions	$IV$. $3$
	$V$. $4$
	$VI$. $2$

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