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Solution


Q.

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:     [2025]
1 1012 kJ mol-1  
2 1402 kJ mol-1  
3 834 kJ mol-1  
4 947 kJ mol-1  

Ans.

(1)