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:
$B:801kJ/mol$
$Al:577kJ/mol$
$Ga:579kJ/mol$
$Ga:[Ar]3d^{10}4s^{2}4p^1$