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 

(1) Statement I is incorrect but statement II is correct. 

(2) Both the statements I and II are correct 

(3) Statement I is correct but statement II is incorrect 

(4) Both the statements I and II are incorrect

Answer 1

(2) Both the statements I and II are correct

The first ionization energies (as in NCERT) are as follows: 

B : 801 kJ/mol 

Al : 577 kJ/mol 

Ga : 579 kJ/mol 

Ga : [Ar]3d¹⁰4s² 4p¹