QJEEM23Chf638: JEE Main 2023 Chemistry - Class 12 JEEM23Chf638 Solution: Given below are two statements : Statement I : The decrease in…
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 in Ga are completely filled.
In the light of the above statements, choose the most appropriate answer from the options given below
Multiple Choice Options
- A Statement I is correct but statement II is incorrect
- B Statement I is incorrect but statement II is correct
- C Both the statements I and II are correct
- D Both the statements I and II are incorrect
Step-by-Step Verified Solution
Statement I is correct as the decrease in first ionization enthalpy from B to Al is indeed much larger than from Al to Ga. This is due to the shielding effect of the electron in the outermost shell and the increased effective nuclear charge as one moves from B to Al and from Al to Ga.
Statement II is also correct, as the d orbitals in Ga are indeed completely filled. This results in the shielding effect being maximum for Ga and thus, the decrease in first ionization enthalpy from Al to Ga is smaller compared to that from B to Al.