The general formula of the compounds formed when group $13$ elements $(A)$ react with group $16$ elements $(B)$ is

Aluminium $(III)$ chloride forms a dimer because ........

Which of the following processes will not yield anhydrous $AlCl_3$?

$A$ certain salt $X$ gives the following results:
$(i)$ Its aqueous solution is alkaline to litmus.
$(ii)$ It swells up to a glassy material $Y$ on strong heating.
$(iii)$ When conc. $H_2SO_4$ is added to a hot solution of $X$,white crystals of an acid $Z$ separate out.
Identify $X, Y$ and $Z$ and write the equations for the reactions.

Which of the following chlorides does not react with $PCl_5$ on heating?

Which one of the following is the correct statement?