Why Zn2+ ions are colourless while Ni2+ ions are green and Cu2+ ions are blue in colour?

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Colour of Transition Metal Compounds, Crystal Field Theory for Coordination Compounds | PadhAiPro

Question

TextColour of Transition Metal CompoundsCrystal Field Theory for Coordination Compounds

Account for the following :

Which ion amongst the following is colourless and why ? Ti4+, Cr3+, V3+ (Atomic number of Ti = 22, Cr = 24, V = 23)

TextVariable Oxidation States of Transition MetalsColour of Transition Metal Compounds

Why is Mn2+ much more resistant than Fe2+ towards oxidation ?

Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.

The electronic configuration of Ce is : 58Ce = [Xe]54 4f1 5d1 6s2 Calculate the spin only magnetic moment of Ce3+ ion.

Why is copper regarded as a transition element although copper atom has completely filled d-orbitals in its ground state ?