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The d-And-f-Block Elements
Question
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Transition metals usually form coloured ions, why?

Answer

Transition elelmet exhibit colour due to d-d transition. d-d transition is possible only when d- subshell have unpaired electron.Except few cases like Zn2+, Hg2+, Cd2+, Ti4+ etc., transition metal ions usually possess one or more unpaired d electrons which undergo d-d transition to impart colour to them.

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Some More Questions From The d-And-f-Block Elements Chapter

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.