When orthophosphoric acid is heated to $600\,^{\circ}C,$ the product formed is

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

What is the product formed when ammonia reacts with excess chlorine?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{P}Cl_5 + H_2O \longrightarrow H_3PO_4 + HCl$

In which of the following is the $P - O - P$ bond present?

$(NH_4)_2Cr_2O_7$ on heating gives: