JEE Main · 2025 · 29 Jan 2025 · Shift 2 · p-Block Elements

WhatsApp Email

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

(A) $1012 kJ mol^{- 1}$ ✓ Correct
(B) $1402 kJ mol^{- 1}$
(C) $834 kJ mol^{- 1}$
(D) $947 kJ mol^{- 1}$

Answer: (A)

Solution

Apatite minerals,

C a_{5} (P O_{4})_{3} (F, C l, O H)

, are built around the phosphate ion, so phosphorus is the main group-15 component of the apatite family. Among the first four group 15 elements, first ionization enthalpy falls as N > P > As > Sb (1402, 1012, 947, 834 kJ/mol) due to increasing atomic size down the group. The value corresponding to phosphorus is 1012 kJ/mol.

JEE Main · 2025 · 29 Jan 2025 · 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 →