In the electrolysis of alumina, cryolite is added to
Increase the melting point of alumina
Increase the electrical conductivity
Minimise the anodic effect
Remove impurities from alumina
Alumina is insoluble in water because
$N{a_2}{B_4}{O_7}\xrightarrow{x}{H_3}B{O_3}\xrightarrow{\Delta }{B_2}{O_3}\xrightarrow{y}B$
Here $X, Y$ are respectively
$AlC{l_3}$ is
Which is true for an element $R$ present in III group of the periodic table
Which reaction involves a change in the electron pair geometry for the underlined element ?