Orthophosphorus acid on disproportionation gives $\mathrm{PH}_3$ and another oxoacid of phosphorus ' $X$ '. The basicity of $X$ is

Select the correct statements from the following

(A) Aluminium liberates $\mathrm{H}_2$ gas with dil. HCl but not with aqueous NaOH .

(B) Formula of sodium metaborate is $\mathrm{Na}_3 \mathrm{BO}_3$.

(C) Boric acid is a weak monobasic acid.

(D) For thallium, +1 state is more stable than +3 state.

The number of amphoteric oxides from the following is $\mathrm{CO}_2, \mathrm{GeO}_2, \mathrm{SnO}_2, \mathrm{PbO}_2$, $\mathrm{CO}, \mathrm{GeO}, \mathrm{SnO}, \mathrm{PbO}$

Complete hydrolysis of xenon hexafluoride gives HF along with compound $X$. The hybridisation in $X$ is