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. Statement I is incorrect but statement II is correct.
• B. Both the statements I and II are correct
• C. Statement I is correct but statement II is incorrect
• D. Both the statements I and II are incorrect

Answer 1

Answer: (B)

The first ionization energies (as in NCERT) are as
follows:
$B : 801 \,kJ/mol $
$Al : 577\, kJ/mol $
$Ga : 579\, kJ/mol $
$Ga :[ Ar ] \,3 d ^{10} \,4 s ^2\, 4 p ^1$