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Solution


Q.

Given below are two statements:

Statement I: The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl < F.

Statement II: The correct order of negative electron gain enthalpy values of Li, Na, F and Cl is Na < Li < F < CI

In the light of the above statements, choose the correct answer from the options given below :                [2024]
1 Both Statement I and Statement II are true  
2 Both Statement I and Statement II are false  
3 Statement I is true but Statement II is false  
4 Statement I is false but Statement II is true  

Ans.

 (1)

Statement (l): Ionization energy decreases down the group and increases from left to right across a period. Hence order is Na<Li<Cl<F.

Statement (II): Electron affinity decreases (or electron gain enthalpy becomes less negative) down the group and increases (or electron gain enthalpy becomes more negative) from left to right across a period. But electron gain enthalpy of F is less negative than that of Cl. This is because due to small size of F, incoming electron,feels significant repulsion from other electrons. So, the order is Na<Li<F<Cl.