The stability of $+ 1$ oxidation state among $Al,Ga, In$ and $Tl$ increases in the sequence
$Al < Ga < In < Tl$
$Tl < In < Ga < Al$
$In < Tl < Ga < Al$
$Ga < In < Al < Tl$
Write reactions to justify amphoteric nature of aluminium.
For purification of alumina, the modern processes most useful when $(i)$ the impurity present is a lot of iron oxides and $(ii)$ the impurity present is a lot of silica, are
Colour of the bead in borax bead test is mainly due to the formation of
Given below are two statements:
Statement $I$: Group $13$ trivalent halides get easily hydrolyzed by water due to their covalent nature.
Statement $II$: $\mathrm{AlCl}_3$ upon hydrolysis in acidified aqueous solution forms octahedral $\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ ion.
In the light of the above statements, choose the correct answer from the options given below :
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of