Which of the following is a coloured compound | vedclass

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(A) Compounds containing transition metal ions with unpaired $d$-electrons exhibit colour due to $d-d$ transitions.In $CuF_2$,copper exists in the $Cu

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$CuF_2$

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(A) Compounds containing transition metal ions with unpaired $d$-electrons exhibit colour due to $d-d$ transitions.In $CuF_2$,copper exists in the $Cu^{2+}$ oxidation state.The electronic configuration of $Cu^{2+}$ is $[Ar] 3d^9$.Since it has one unpaired electron in the $3d$ orbital,it undergoes $d-d$ transitions and appears coloured.In contrast,$CuI$ involves $Cu^+$ ($3d^{10}$,no unpaired electrons),while $NaCl$ and $MgCl_2$ contain ions with noble gas configurations ($d^0$ or $d^{10}$),making them colourless.

Which of the following is a coloured compound?

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