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The d-And-f-Block Elements
Question
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Which of the following do you expect to be coloured and why? Cr+, Cu+?

Answer

Transition element exhibit colour due to d-d transition. This is possible only when d- subshell have unpaired electron. Cr+ is coloured because of the presence of partially filled d-orbitals (3d5 4s0) whereas Cu+ is colourless because of completely filled d-orbitals (3d10 4s0).

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

The E° (M2+/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this? 

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

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?