Why ${\mathrm{LiNO}}_3$ on heating shows exceptional behaviour than other elements of this group?

Write the order of thermal stability of the following:

${\mathrm{BeSO}}_4, {\mathrm{MgSO}}_4, {\mathrm{CaSO}}_4, {\mathrm{SrSO}}_4$

Write the increasing order of basic strength of the following

$\mathrm{NaOH}, \mathrm{KOH}, \mathrm{RbOH}, \mathrm{CsOH}$

$\left(\mathrm{i}\right)$ $\mathrm{M}+{\mathrm{H}}_2{\mathrm{SO}}_4 ⟶\dots \dots \dots +..........$               (where $\mathrm{M}=$ group-$\mathrm{I}$ elements)

$\left(\mathrm{ii}\right)$ $\mathrm{M}+\mathrm{HCl} ⟶\dots \dots \dots +............$                 (where $\mathrm{M}=$ group-$\mathrm{II}$ elements)