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Given below are two statements: Statement-I: The correct order in terms of atomic/ionic radii is Al > Mg > Mg2+ > Al3+. Statement-II: The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O. In the light of the above statements, choose the correct answer from the options given below:

1. Both Statement I and Statement II are false
2. Statement I is false but Statement II is true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are true

Correct answer: Statement I is false but Statement II is true

Solution

Statement I is incorrect because the ionic radii decrease with increasing positive charge, making Al3+ smaller than both Al and Mg. Statement II is correct as electron gain enthalpy generally increases across a period and decreases down a group, with chlorine having a higher electron gain enthalpy than bromine, sulfur, and oxygen.

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