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Solution


Q.

Given below are two statements:

Statement I: The radii of isoelectronic species increases in the order.  Mg2+<Na+<F-<O2-

Statement II: The magnitude of electron gain enthalpy of halogen decreases in the order. Cl>F>Br>I

In the light of the above statements, choose the most appropriate answer from the options given below:        [2025]
1 Both Statement I and Statement II are incorrect  
2 Statement I is correct but Statement II is incorrect  
3 Statement I is incorrect but Statement II is correct  
4 Both Statement I and Statement II are correct  

Ans.

(4)

Statement I:

For isoelectronic species, r∝1Z

Statement II: Electron affinity decreases down the group because as we move down the group, incoming electron is added farther away from the nucleus hence feels less attraction. However, electron affinity of F is less than expected value because of inter-electronic repulsion faced by the incoming electron on account of extremely small size of F.