Consider the following statements for (NH₄)₂[Ce(NO₃)₆] (Z) (A) Coordination number of Ce is 12 (B) Z is… · ABC26IN0172
Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Magnetic Properties 4f · Exam: CSIR NET 2015 · Marks: 2 · Difficulty: Medium
Consider the following statements for $\mathrm{(NH_4)_2[Ce(NO_3)_6]}$ (Z) (A) Coordination number of Ce is 12 (B) Z is paramagnetic (C) Z is an oxidising agent (D) Reaction of $\mathrm{Ph_3PO}$ with Z gives a complex having coordination number 10 for Ce. The correct statements are
(a)A, B and C
(b)B, A and D
(c)B, C and D
(d)A, C and D
Answer
Answer (as printed): D
Explanation
(NH4) 2[Ce(NO3) 6](Z) (1) NO-3 behaves as bidentate ligand. Hence, C.N = 12 (2) Ce+4 has no unpaired electron hence dimagnetic not paramagnetic. (3) Ce+4 has higher oxidation state hence behave as oxidising agent. (4) (NH4) 2[Ce(NO3) 6] on reaction with Ph3PO gives [Ce(NO3) 4(Ph3PO)2] having . C.N.=10. Hence correct statement. OPPh3 = mono dentate ligand; NO3= bidentate [CSIR DEC 2015]
Explanation as extracted from the printed page; notation may be imperfect.