Which of the following compounds is colored?

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(D) compound is colored if it contains transition metal ions with partially filled $d$-orbitals,allowing for $d-d$ transitions.$TiCl_3$ contains $Ti^{

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All of the above

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(D) compound is colored if it contains transition metal ions with partially filled $d$-orbitals,allowing for $d-d$ transitions.$TiCl_3$ contains $Ti^{3+}$ $(3d^1)$,which is colored (purple).$FeCl_3$ contains $Fe^{3+}$ $(3d^5)$,which is colored (yellow/brown).$CoCl_2$ contains $Co^{2+}$ $(3d^7)$,which is colored (blue/pink).Since all these compounds contain transition metal ions with unpaired electrons in $d$-orbitals,they are all colored.

column-$I$ $(\text{Property})$	column-$II$ $(\text{Metal})$
$i$. An element which can show $+8$ oxidation state	$a$. $Mn$
$ii$. $3d$ series element that can show upto $+7$ oxidation state	$b$. $Cr$
$iii$. $3d$ series element with highest melting point	$c$. $Os$

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