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(a) Account for the following : (i) Cop...

(a) Account for the following :
(i) Copper(I) compounds are white whereas Copper(II) compounds are coloured.
(ii) Chromates change their colour when kept in an acidic solution.
(iii) Zn,Cd, Hg are considered as d-block elements but not as transition elements.

(b) Calculate the spin only moment of `Co^(2+)``(Z=27)` by writing the electronic configuration of `Co` and `Co^(2+)`

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