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Account for the following: (i) Copper (...

Account for the following:
(i) Copper (I) compounds are white whereas Copper (II) compounds are coloured.
(ii) Transition metals and their compounds show catalytic activities.
(iii) Zn,Cd,Hg are considered as d-block elements but not as transition elements
(iv) Transition metals and many of their compounds show paramagnetic behaviour.
(v) Transition metals can form alloy.

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