Question

Statement-1 : The third ionisation enthalpy of La, Gd and Lu are abnormally low.
Statement-2 : Empty, half-filled and completelt filled orbitals of f-level are extra stable.
A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.
B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.
C. Statement-1 is True, Statement-2 is false
D. Statement-1 is False and Statement-2 is True.

Answer 1

Correct Answer - A
`La^(3+) rarr 4f^(0), Gd^(3+) rarr 4f^(7), Lu^(3+) rarr 4f^(14)`