The conjugate base of phosphorus acid is $x$. The conjugate base of oleum is $y$. What are $x$ and $y$, respectively?

Consider the following

Statement-I $\mathrm{CCl}_4$ does not undergo hydrolysis. But $\mathrm{SiCl}_4$ undergoes hydrolysis.

Statement-II Thermal and chemical stability of $\mathrm{GeX}_4$ is more than $\mathrm{GeX}_2$.

The correct answer is

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.