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Given below are two statements : Statement-I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement-II : The d-orbitals Ga are completely filled. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Statement I is correct but statement II is incorrect (2) Statement I is incorrect but statement II is correct (3) Both the statement I and II are correct (4) Both the statement I and II are incorrect

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

Correct answer: Both the statement I and II are correct

Solution

Statement I is correct because the first ionization enthalpy decreases significantly from B to Al due to increased atomic size and shielding effect, while the decrease from Al to Ga is less pronounced due to the presence of d-electrons which provide additional shielding. Statement II is also correct as Ga has a filled d-subshell, which influences its ionization energy.

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