The reaction of $NO$ with $N_2O_4$ at $250 \ K$ gives :

Orthophosphorus acid on disproportionation gives $PH_3$ and another oxoacid of phosphorus '$X$'. The basicity of $X$ is

The oxidation number of phosphorus varies from

Which of the following is an incorrect match?

An orange solid $(X)$ on heating,gives a colourless gas $(Y)$ and a green residue $(Z).$ Gas $(Y)$ on treatment with $Mg,$ produces a white solid substance. Identify the white solid substance.

$NH_3$ reacts with bleaching powder to give: