In the modern process,phosphorus is manufactured by:

The element which catches fire in air at $30^o\,C$ and is stored under water is

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.

Consider the following statements:-
$I. \, PCl_3$ hydrolyses in the presence of moisture giving fumes of $HCl$.
$II. \, PCl_5$ exists as $[PCl_4]^+[PCl_6]^-$ in the solid state.
$III. \, $All the five bonds in the $PCl_5$ molecule are equivalent.
Choose the correct statements.

The correct order of boiling points of hydrides of $15^{th}$ group elements is

The correct code for stability of oxidation states for given cations is:
$(i)$ $Pb^{2+} > Pb^{4+}, Tl^{+} < Tl^{3+}$
$(ii)$ $Bi^{3+} < Sb^{3+}, Sn^{2+} < Sn^{4+}$
$(iii)$ $Pb^{2+} > Pb^{4+}, Bi^{3+} > Bi^{5+}$
$(iv)$ $Tl^{3+} < In^{3+}, Sn^{2+} > Sn^{4+}$
$(v)$ $Sn^{2+} < Pb^{2+}, Sn^{4+} > Pb^{4+}$
$(vi)$ $Sn^{2+} < Pb^{2+}, Sn^{4+} < Pb^{4+}$