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In some of the reactions, thallium resem...

In some of the reactions, thallium resembles aluminium whereas in others it resembles with group `1` metals. Support this statement by giving some evidence.

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Aluminium (Al) generally exhibits +3 oxidation state in its compoudns. Thallium (Tl) the last member of the group -13, is expected to show oxidation states of +3 and +1 (due to inert pair effect). Thus, the metal resembles aluminium in exhibiting +3 oxidation state. Both form trichlorides `TiCl_(3)` and `AlCl_(3)` at the same time., it also resembles alkali metals of group 1 in exhibing +1 oxidation state (e.g., both thallium and sodium form monochlorides TiCL and NaCl) For further details, consult 11.2.
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