Thermal stability: $HF\, >\, HCl\, > \,HBr \,> \,HI$
The decrease in thermal stability is due to decrease in bond dissociation enthalpy.
$\Delta_{\text {diss }} H :- HF \,>\, HCl\, > \,HBr \,>\, HI$
Bond angle: $NH _3\,>\, PH _3\,>\, AsH _3$
Lewis basic character: $PF _3\,<\, PCl _3\,<\, PBr _3$
$(i)$ $PCl_3 + 3H_2O \to H_3PO_3 + 3HCl$
$(ii)$ $SF_4 + 3H_2O \to H_3SO_3 + 4HF$
$(iii)$ $BCI_3 + 3H_2O \to H_3BO_3 + 3HCl$
$(IV)$ $XeF_6 + 3H_2O \to XeO_3 + 6HF$
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