Given below are two statements: Statement-I: The correct order in terms of atomic/ionic radii is Al Mg Mg 2+ Al 3+. Statement-II: The correct order in terms of the magnitude of electron gain ent

Question

Given below are two statements: Statement-I: The correct order in terms of atomic/ionic radii is Al > Mg > Mg 2+ > Al 3+. 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:

(A) Both Statement I and Statement II are false
(B) Statement I is false but Statement II is true
(C) Statement I is true but Statement II is false
(D) Both Statement I and Statement II are true

Prashant Kotian · Accepted Answer

Correct answer: B. Correct order of size is Mg > Al > Mg 2+ > Al 3+ Atomic size depends mainly upon Zeffective and shell number. Generally on moving down the group electron affinity decreases and on moving across the period electron affinity increase. In the periodic table Cl has maximum electron affinity. Halogen has higher electron affinity than Chalcogen. Cl > Br > S > O

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