Why do transition metals form coloured complexes ?

(a) What is Lanthanoid contraction? Give the cause of lanthanoid contraction. (b) Why do transition metals form many coloured ions?

(a) Why are Zn, Cd and Hg not regarded as transition metals? (b) Why do transition metals form complexes ? (c ) Why are Zn^(2+) salts white in colour?

(b) Why do transition metals form alloy ?

(a) Why do transition metals and their compounds are found to be good catalysts? (b) The 5d series of transition metals have more frequent metal-metal bonding in their compounds than do the 3d and 4d metals. Explain. (c ) Why do transition metals form complexes? (d) Explain why Cu^+ ion is not stable in aqueous solution. (e ) Why is europium (II) more stable than cerium (II)?

Which of the following sentences is not suitable for the capacity of transition metal to form complex compounds ?

The tendency of the transition elements to form coloured compounds is attributed to

Explain giving reason: (a) Transition metals and many of their compounds show paramagnetic behaviour. (b) The enthalpies of atomisation of the transition metals are high. (c). The transition metals gnerally form coloured compounds.