D And F Block Elements Question 12

Question 12 - 2024 (30 Jan Shift 1)

Diamagnetic Lanthanoid ions are:

(1) $Nd^{3+}$ and $Eu^{3+}$

(2) $La^{3+}$ and $Ce^{4+}$

(3) $Nd^{3+}$ and $Ce^{4+}$

(4) $Lu^{3+}$ and $Eu^{3+}$

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Answer (2)

Solution

$Ce:[Xe] 4 f^{1} 5 d^{1} 6 s^{2} ; Ce^{4+}$ diamagnetic

$La:[Xe] 4 f^{0} 5 d^{1} 6 s^{2} ; La^{3+}$ diamagnetic