JEE Main202430 Jan 2024Morning ShiftChemistryd and f Block ElementsActual
Diamagnetic Lanthanoid ions are:
Options
- ANd 3 + and Eu 3 +
- BLa 3 + and Ce 4 +
- CNd 3 + and Ce 4 +
- DLu 3 + and Eu 3 +
Correct answer
B. La 3 + and Ce 4 +
Step-by-step solution
Lanthanide ion with no unpaired electron is diamagnetic in nature. Lanthanoid is also called lanthanide, which can be defined as any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57 - 71 ). With the elements scandium and yttrium, they make up the rare-earth metals. Lanthanides are also radioactive in nature. Ce : [ Xe ] 4 f 1 5 d 1 6 s 2 ; Ce 4 + diamagnetic La : [ Xe ] 4 f 0 5 d 1 6 s 2 ; La 3 + diamagnetic Hence, the answer is option B.