Conc. $HNO_3$ can be stored in a container of

Consider the following statements about group $13$ elements:
$A$. $AlCl_3$ achieves stability by forming a dimer.
$B$. $BCl_3$ is an electron-deficient molecule.
$C$. $E^0_{M^{3+}/M^0} \ (V)$ is $+1.26 \ V$ for aluminium.
$D$. In $+1$ oxidation state, thallium is unstable.
The incorrect statements are:

In diborane,the $H-B-H$ bond angle is $120^o$. The hybridization of boron is likely to be

Describe the general trends in the following properties of the elements in Groups $13$ and $14$.
$(A)$ Atomic size
$(B)$ Ionization enthalpy
$(C)$ Metallic character
$(D)$ Oxidation states
$(E)$ Nature of halides

Anhydrous $AlCl_3$ is obtained from

The alum used for purifying water is