Attempt any five of the following :

(a) Why Zinc is not regarded as a transition element ?
(b) What is Lanthanoid contraction ?
(c) Why is first ionization enthalpy of chromium lower than that of Zn ?
(d) Why are transition elements good catalysts?
(e) Compounds of transition metals are generally coloured. Give reason.
(f) Out of KMnO₄ and K₂MnO₄,which one is paramagnetic and why?
(g) Complete the following ionic equation:

Cr₂O₇^2-+14H⁺+6e^--->

Solution

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