Which of the following complex ions is expect | vedclass

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(C) Only those transition metal complexes are expected to absorb visible light in which the $d$-subshell is incomplete,allowing for $d-d$ electronic t

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$[Cr(NH_3)_6]^{3+}$

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(C) Only those transition metal complexes are expected to absorb visible light in which the $d$-subshell is incomplete,allowing for $d-d$ electronic transitions. $(A)$ In $[Ti(en)_3]^{4+}$,$Ti$ is in the $Ti^{4+}$ state: $[Ar] 3d^0$. Since there are no $d$-electrons,no $d-d$ transition is possible. $(B)$ In $[Sc(NH_3)_4(H_2O)_2]^{3+}$,$Sc$ is in the $Sc^{3+}$ state: $[Ar] 3d^0$. No $d$-electrons are available for transition. $(C)$ In $[Cr(NH_3)_6]^{3+}$,$Cr$ is in the $Cr^{3+}$ state: $[Ar] 3d^3$. The presence of unpaired electrons in the $d$-orbitals allows for $d-d$ transitions,making it absorb light in the visible region. $(D)$ In $[Zn(CN)_4]^{2-}$,$Zn$ is in the $Zn^{2+}$ state: $[Ar] 3d^{10}$. The $d$-subshell is completely filled,so no $d-d$ transition is possible. The correct option is $C$.

Which of the following complex ions is expected to absorb light in the visible region?

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