First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value…

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 :
  1. $1402 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  2. $834 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  3. $1012 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  4. $947 \mathrm{~kJ} \mathrm{~mol}^{-1}$

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

Asked in: JEE Main 2025 (29 Jan Shift 2)

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