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# In the below reaction X and Y are respectively

$\begin{array}{1 1}(a)\;HNO_2,H_3PO_2&(b)\;NaNO_2\;and\;HCl,H_3O^{\oplus}\\(c)\;HNO_2,H_3PO_3&(d)\;\text{None}\end{array}$

$X=NaNO_2+HCl$ (or) $HNO_2$
$Y=H_3PO_2$
Hence (a) is the correct answer.