\(\mathrm{NaH}_{2} \mathrm{PO}_{2}+\mathrm{HCl} \longrightarrow \mathrm{NaCl}+\mathrm{H}_{3} \mathrm{PO}_{2}(Y)\)
\(\mathrm{H}_{3} \mathrm{PO}_{2}\to \) mono basic acid
$Xe{{F}_{6}}\,\xrightarrow{+\,Excess\,\,{{H}_{2}}O}\,'X'\,+\,HF$
$Xe{{F}_{6}}\,\xrightarrow{+\,2\,\,{{H}_{2}}O}\,'Y'\,+\,HF$