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

What are the correct statements about the elements of group $13$ given below?
$(I)$ The stability of $+1$ oxidation state follows the order $Tl > In > Ga$
$(II)$ Boron has the lowest melting point and boiling point as it is a non-metal
$(III)$ Boron shows a maximum covalency of $4$ in its compounds
$(IV)$ The order of atomic radius is $Ga > Al > In$
$(V)$ Aluminium is passive to concentrated nitric acid

Which of the following compounds is formed in the borax bead test?

The first ionization enthalpy values (in $kJ\, mol^{-1}$) of group $13$ elements are:

Element	$B$	$Al$	$Ga$	$In$	$Tl$
Ionization Enthalpy	$801$	$577$	$579$	$558$	$589$

How would you explain this deviation from the general trend?

Explain the structures of diborane and boric acid.

In the reactions $I$ and $II$,the covalencies of $Be$ and $Al$ in $X$ and $Y$ are respectively:
$I$ $Be(OH)_2 + NaOH \text{ (excess)} \rightarrow X$
$II$ $Al(OH)_3 + NaOH \text{ (excess)} \rightarrow Y$