Hydrated $AlC{l_3}$ is used as
Catalyst in cracking of petroleum
Catalyst in Friedel Craft reaction
Mordant
All of these
In the purification of bauxite by Hall's process
During metallurgy of aluminium bauxite is dissolved in cryolite because
During the borax bead test with $CuSO _4$, a blue green colour of the bead was observed in oxidising flame due to the formation of
$N{a_2}{B_4}{O_7}.10{H_2}O\xrightarrow{{Heat}}X + NaB{O_2} + {H_2}O,X + C{r_2}{O_3}\xrightarrow{{Heat}}\mathop Y\limits_{\left( {Green\,coloured} \right)} $ $X$ and $Y$ are
Borax is actually made of two tetrahedra and two triangular units joined together and should be written as : $Na_2[B_4O_5(OH)_4]·8H_2O$
Consider the following statements about borax :
$a.$ Each boron atom has four $B-O$ bonds
$b.$ Each boron atom has three $B-O$ bonds
$c.$ Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds
$d.$ Each boron atom has one $-OH$ groups
Select correct statement(s) :