Which of the following has a colored aqueous | vedclass

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(C) Aqueous solutions of transition metal ions are colored due to $d-d$ transitions if they have partially filled $d$-orbitals. $Zn^{2+}$ has a $3d^{1

Vedclass · Accepted Answer

$Co(NO_3)_2$

Vedclass · Answer

(C) Aqueous solutions of transition metal ions are colored due to $d-d$ transitions if they have partially filled $d$-orbitals. $Zn^{2+}$ has a $3d^{10}$ configuration (fully filled),so it is colorless. $Li^+$ is an alkali metal ion with no $d$-electrons,so it is colorless. $Co^{2+}$ has a $3d^7$ configuration (partially filled),which allows for $d-d$ transitions,making its aqueous solution pink/colored. Potash alum $(KAl(SO_4)_2 \cdot 12H_2O)$ contains $Al^{3+}$,which has no $d$-electrons,making it colorless. Therefore,the correct answer is $Co(NO_3)_2$.

Which of the following has a colored aqueous solution?

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