P Block Elements Group 13 Question 3
Question 3 - 29 January - Shift 2
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
Show Answer
Answer: (2)
Solution:
Formula: Trend in Ionization Enthalphy
The first ionization energies (as in NCERT) are as follows:
B : $801 kJ / mol$
$Al: 577 kJ / mol$
$Ga: 579 kJ / mol$
$Ga:[Ar] 3 d^{10} 4 s^{2} 4 p^{1}$
