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GATE 2023 CY – Question 54

Inorganic Chemistry · Lanthanides and Actinides: Recovery. Periodic properties, spectral and magnetic properties. · 2 marks · Multiple select

Which compounds have metal ions with $[Xe]4f^1$ configuration? Atomic numbers: Ce 58, Lu 71, Pr 59, Nd 60.

  1. $Na_3[Ce(NO_3)_6]$
  2. $Na_3[LuCl_6]$
  3. $PrO_2$
  4. $Nd(NR_2)_3$, $R=SiMe_3$

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Correct answer: (A) $Na_3[Ce(NO_3)_6]$; (C) $PrO_2$

Explanation

In Na3[Ce(NO3)6], Ce is+3, so 4f1. PrO2 contains Pr4+, also 4f1. Lu3+ in its hexachloro complex is 4f14, and Nd3+ in the trisamide is 4f3.

Therefore **A, C** alone have the configuration specified; remove 6s and 5d electrons before counting retained 4f electrons.