The chloride of which of the following elemen | vedclass

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(D) . Cobalt $(CoCl_2)$ is coloured because the $Co^{2+}$ ion has an electronic configuration of $[Ar] 3d^7$,which contains unpaired electrons. Transi

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Cobalt

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(D) . Cobalt $(CoCl_2)$ is coloured because the $Co^{2+}$ ion has an electronic configuration of $[Ar] 3d^7$,which contains unpaired electrons. Transition metal ions with unpaired $d$-electrons exhibit $d-d$ transitions,resulting in colour. In contrast,$Ag^+$,$Hg^{2+}$,and $Zn^{2+}$ have $d^{10}$ configurations (fully filled $d$-orbitals),making their chlorides colourless.

The chloride of which of the following elements will be coloured?

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