Which compound has a coloured aqueous solutio | vedclass

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(C) Transition metal compounds exhibit colour in aqueous solution due to the presence of unpaired $d$-electrons,which allow for $d-d$ transitions. In

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$Co(NO_3)_2$

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(C) Transition metal compounds exhibit colour in aqueous solution due to the presence of unpaired $d$-electrons,which allow for $d-d$ transitions. In $Zn(NO_3)_2$,$Zn^{2+}$ has a $3d^{10}$ configuration (no unpaired electrons). In $LiNO_3$,$Li^+$ is an alkali metal ion with no $d$-electrons. In $Ba(NO_3)_2$,$Ba^{2+}$ is an alkaline earth metal ion with no $d$-electrons. In $Co(NO_3)_2$,$Co^{2+}$ has a $3d^7$ configuration,which contains unpaired electrons,making the aqueous solution coloured.

Which compound has a coloured aqueous solution?

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