JEE Main · 2021 · 26 Aug 2021 · Shift 2 · p-Block Elements

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of

PCl_{5}

is:

(A)2
(B)1
(C)3
(D)0✓ Correct

Answer: (D)

Solution

Hydrolysis of phosphorus pentachloride passes through

POC l_{3}

and ends at orthophosphoric acid:

PC l_{5} + 4 H_{2} O \to H_{3} P O_{4} + 5 HCl

H_{3} P O_{4}

the phosphorus carries one

P = O

bond and three

P - OH

groups, and no hydrogen is bonded directly to phosphorus. Every hydrogen therefore sits on oxygen and is ionisable, so the number of non-ionisable hydrogen atoms in the final product is zero.

JEE Main · 2021 · 26 Aug 2021 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on p-Block Elements →

More JEE Main questions on p-Block Elements

Given below are two statements:

Statement I: The number of pairs among [ $SiO_{2}, CO_{2}$ ], $[SnO, SnO_{2}], [PbO, PbO_{2}]$ and $[GeO, GeO_{2}]$ , which contain oxides t …
JEE Main 2026View solution →
A 'p'-block element (E) and hydrogen form a binary cation $(EH_{x})^{+}$ , while $EH_{3}$ on treatment with $K_{2} HgI_{4}$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first …
JEE Main 2026View solution →
Given below are two statements :

Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group.

Statement II : A group 15 element's hydride $EH_{3}$ has the lowest boiling point among corresponding hydrides of oth …
JEE Main 2026View solution →
Two p-block elements X and Y form fluroides of the type $EF_{3}$ . The fluoride compound $XF_{3}$ is a Lewis acid and $YF_{3}$ is a Lewis base. The hybridization of the central atoms of $XF_{3}$ and $YF_{3}$ respectively are
JEE Main 2026View solution →
Given below are two statements:

Statement I: The correct order in terms of bond dissociation enthalpy is $Cl_{2} > Br_{2} > F_{2} > I_{2}$
Statement II: The correct trend in the covalent character of the metal halides is …
JEE Main 2026View solution →
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 …
JEE Main 2026View solution →