Statement I : The first ionization enthalpy of aluminium is lower than that of magnesium
Statement II : Atomic radius of aluminium is smaller than that of magnesium

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Statement I and Statement II are true.

Statement I is false and Statement II is true.

Statement I is true and statement II is false.

Statement I and Statement II are false.

answer is A.

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Detailed Solution

1) IP₁ of "Al"<IP₁ of "Mg" because
A) Symmertrical configuration in Mg
B) Penetrating ability of "3s" electron is more than "3p" electron.
C) Screening effect in "Al" is less than "Mg"
2) Atomic radius of aluminium is smaller than that of magnesium.

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