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Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga. Statement (II) : The ionic radius of Al3+ is less than that of Ga3+. In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement-I is incorrect but Statement-II is correct
2. Both Statement-I and Statement-II are incorrect
3. Both Statement-I and Statement-II are correct
4. Statement-I is correct but Statement-II is incorrect

Correct answer: Statement-I is incorrect but Statement-II is correct

Solution

Statement I is incorrect because gallium has a smaller metallic radius than aluminum due to its higher effective nuclear charge and the presence of d-electrons, which contract the radius. Statement II is correct as the ionic radius of Al3+ is indeed smaller than that of Ga3+ due to the higher charge density of Al3+, leading to a greater attraction of electrons towards the nucleus.

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