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On the basis of lanthanoid contraction, ...

On the basis of lanthanoid contraction, explain the following:
(i) Nature of bonding in `La_(2)O_(3)` and `Lu_(2)O_(3)`.
(ii) Trends in the stability of oxo salts of lanthanoids from La to Lu.
(iii) Stability of the complexes of lanthanoids.
(iv) Radii of 4d and 5d block elements.
(v) Trends in acidic character of lanthanoids oxides.

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