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.

Question

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

(A) Both the statements I and II are incorrect
(B) Statement I is correct but statement II is incorrect
(C) Statement I is incorrect but statement II is correct
(D) Both the statements I and II are correct

Prashant Kotian · Accepted Answer

Correct answer: D. Element B Al Ga In Tl IE1 (KJ/mol) 577 558 IE1 of B & Al in greater than IE1 of Al & Ga. This is due to completely filled d-orbitals in Ga and d-electron have low screening effect to compensate the increase in nuclear charge.

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