JEE Main 202529 JanuaryEvening Shift

Exam: JEE Main
Year: 2025
Date: 29 January
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2025 · 29 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

First ionisation enthalpy values of first four group 15 elements...

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 :

Options

A $1402 \mathrm{~kJ} \mathrm{~mol}^{-1}$
B $834 \mathrm{~kJ} \mathrm{~mol}^{-1}$
C $1012 \mathrm{~kJ} \mathrm{~mol}^{-1}$
D $947 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Correct answer

C. $1012 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Step-by-step solution

The main component of apatite family is phosphorus. Order of

\mathrm{IE}_1

of group 15 elements

\mathrm{N}>\mathrm{P}>\mathrm{As}>\mathrm{Sb}

IE of phosphorus

=1012 \mathrm{~kJ} \mathrm{~mol}^{-1}

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