The most stable hydride is

Which of the following combinations does not liberate $NH_3$ gas?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T$:
$\underline{P}Cl_3 + H_2O \longrightarrow H_3PO_3 + HCl$

Which among the following oxoacids of phosphorus shows a tendency of disproportionation?

Which of the following pairs of oxoacids have a basicity of $2$?

Which gas gives white fumes with $HCl$?