(a) Write any two consequences of Lanthanide Contraction.
(b) Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.

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Detailed Solution

(a) The two consequences of Lanthanide contraction are :
(i) Small change in the atomic radii because of Lanthanide contraction leads to difficulty in the separation of lanthanides.
(ii) Due to Lanthanide contraction , these elements occurs together in natural minerals and are difficult to separate.

(b) The element is Manganese (Z=25)
Since the 3d and 4s orbitals are very close so the affinity to loose electrons is easy as it has unpaired electrons. Hence it has maximum oxidation state from +2 to +7.

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