Which element from group $15$ ($V$ group) forms the most basic compound with hydrogen?

Which of the following is not correct?

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 of the following compounds will not give $NH_3$ on heating?

Nitrogen gas is obtained by thermal decomposition of .... .

Which of the following has the lowest boiling point?