The formula of borax is

Inorganic benzene is

Select the correct statements from the following:
$A$) Aluminium liberates $H_2$ gas with dil. $HCl$ but not with aqueous $NaOH$.
$B$) Formula of sodium metaborate is $Na_3BO_3$.
$C$) Boric acid is a weak monobasic acid.
$D$) For thallium,$+1$ state is more stable than $+3$ state.

Give the origin and occurrence of group $13$ elements.

Identify the incorrect pair from the following:

Orthoboric acid in aqueous medium is