Which of the following complexes is colored?

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(C) complex is colored if it contains a metal ion with an incomplete $d$-subshell,allowing for $d-d$ transitions.In $[Cr(NH_3)_5Cl]^{2+}$,the oxidatio

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$[Cr(NH_3)_5Cl]^{2+}$

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(C) complex is colored if it contains a metal ion with an incomplete $d$-subshell,allowing for $d-d$ transitions.In $[Cr(NH_3)_5Cl]^{2+}$,the oxidation state of $Cr$ is $+3$.The electronic configuration of $Cr^{3+}$ is $[Ar] 3d^3$.Since it has unpaired electrons in the $d$-orbitals,it undergoes $d-d$ transitions and exhibits color.$Ti(NO_3)_4$ contains $Ti^{4+}$ $(3d^0)$,$[Cu(NCCH_3)_4]^{+}$ contains $Cu^{+}$ $(3d^{10})$,and $Li[AlH_4]$ contains $Al^{3+}$ $(3d^0)$,all of which are colorless due to the absence of $d-d$ transitions.

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