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The d-And-f-Block Elements

Short Answer Type

71.

Why is copper sulphate pentahydrate coloured?

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72. Transition metals usually form coloured ions, why?

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73. Zn, Cd, Hg compounds are usually white. Explain.

Transition elelmet exhibit colour due to d-d transition. d-d transition is possible only when d- subshell have unpaired electron.All show +2 oxidation state involving (n–1) d¹⁰ configuration having no unpaired electron in subshell. Thus d-d transition is not possible.

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