JEE Main 2025 Jan 29 Shift 2, Chemistry Q19: Periodicity In Atomic Properties

JEE Main2025Jan 29, Shift 2Chemistry

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 $m o l^{- 1}$
B
$1402$ kJ $m o l^{- 1}$
C
$834$ kJ $m o l^{- 1}$
D
$947$ kJ $m o l^{- 1}$

Solution

Apatite minerals have the general formula $C a_{5} (P O_{4})_{3} (F, C l, O H)$ , so the main group-15 element in the family is phosphorus.

The first ionisation enthalpies of the first four group-15 elements are: $N \approx 1402$ , $P \approx 1012$ , $A s \approx 947$ , $S b \approx 834$ kJ $m o l^{- 1}$ .

$∴$ The value for phosphorus is $1012$ kJ $m o l^{- 1}$ .

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JEE Main 2025 Jan 29 Shift 2, Chemistry Q19: Periodicity In Atomic Properties

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