Verified Solution • 2025–26 Session
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QJEEM25Chda73: JEE Main 2025 Chemistry - Class 11 JEEM25Chda73 Solution: First ionisation enthalpy values of first four group 15…
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:
Multiple Choice Options
- A 834 kJ mol−1
- B 947 kJ mol−1
- C 1402 kJ mol−1
- D 1012 kJ mol−1
Step-by-Step Verified Solution
The element that is a main component of the apatite family (e.g., Fluorapatite) is Phosphorus (P). Phosphorus is the second element in Group 15 of the periodic table.
Ionization enthalpy decreases down the group as atomic size increases. Comparing the four values provided:
- 1402 kJ mol-1: Nitrogen (1st element)
- 1012 kJ mol-1: Phosphorus (2nd element)
- 947 kJ mol-1: Arsenic (3rd element)
- 834 kJ mol-1: Antimony (4th element)
Therefore, the correct value for Phosphorus is 1012 kJ mol-1.