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

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

1402 kJ mol−1^{-1}

B

834 kJ mol−1^{-1}

C

1012 kJ mol−1^{-1}

D

947 kJ mol−1^{-1}

Answer

Option C – 1012 kJ mol⁻¹

Explanation

Solution

Explanation:
Apatite is a calcium phosphate, and its phosphate component contains phosphorus. In group 15, the first ionisation enthalpies of N, P, As, and Sb approximately are 1402, 1012, 947, and 834 kJ mol⁻¹ respectively. Hence, phosphorus has a first ionisation enthalpy of about 1012 kJ mol⁻¹.