Mention isotops of boron.
Boron has two isotops : $(i)$ ${ }^{10} \mathrm{~B}(19 \%)$ and $(ii)$ ${ }^{11} \mathrm{~B}(81 \%)$
Aluminium is obtained by
The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite $(Na_3AlF_6)$ is :
$H_3BO_3$ $\xrightarrow{{{T_1}}}X\xrightarrow{{{T_2}}}Y\xrightarrow{{red\,hot}}$ $B_2O_3$
if $T_1 < T_2$ then $X$ and $Y$ respectively are
Alumina is insoluble in water because
Which elements of group $13$ possess both $+1$ and $+3$ oxidation state?
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