Among $P_2O_5$,$As_2O_3$,$Sb_2O_3$,and $Bi_2O_3$,the most acidic oxide is

Which of the following acids exists in a polymeric form?

In which oxidation state,group $15$ elements act as Lewis base?

Given below are two statements:
Statement-$I$: Element '$X$' and '$Y$' are the most and least electronegative elements, respectively, among $N, As, Sb$ and $P$. The nature of the oxides $X_{2}O_{3}$ and $Y_{2}O_{3}$ is acidic and amphoteric, respectively.
Statement-$II$: $BCl_{3}$ is covalent in nature and gets hydrolysed in water. It produces $[B(OH)_{4}]^{-}$ and $HCl$ in aqueous medium.

Which among the following oxides of nitrogen is called nitrogen sesquioxide?

When ammonium dichromate is heated,the gas formed is