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Consider the following statements for (NH4)2[Ce(NO3)6] (Z)
(I) Coordination number of Ce is 12
(II) Z is paramagnetic
(III) Z is an oxidizing agent
(IV) Reaction of Ph3PO with Z gives a complex having coordination number 10 for Ce.
The correct statements are
  • a)
    I, II and III
  • b)
    II, I and IV
  • c)
    II, III and IV
  • d)
    I, III and IV
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements for (NH4)2[Ce(NO3)6] (Z)(I) Coordina...
All the statements are correct except,  Z is an oxidizing agent.
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Consider the following statements for (NH4)2[Ce(NO3)6] (Z)(I) Coordina...
Explanation:

  • Statement I: Coordination number of Ce is 12.


    • The given compound is (NH4)2[Ce(NO3)6] where Ce is surrounded by six NO3- ions as well as six NH4+ ions.

    • The coordination number of Ce is the sum of ligands surrounding the metal ion, which is 12 in this case.

    • Therefore, statement I is correct.


  • Statement II: Z is paramagnetic.


    • The complex has unpaired electrons due to the presence of Ce(IV) ion which has an electron configuration of 4f15d0.

    • The complex is therefore paramagnetic.

    • Therefore, statement II is correct.


  • Statement III: Z is an oxidizing agent.


    • The Ce(IV) ion is present in the complex, which has a tendency to accept electrons and get reduced to Ce(III) ion.

    • Therefore, the complex is an oxidizing agent.

    • Therefore, statement III is correct.


  • Statement IV: Reaction of Ph3PO with Z gives a complex having coordination number 10 for Ce.


    • Ph3PO is a triphenylphosphine oxide ligand, which is a strong field ligand.

    • It can replace one of the NO3- ligands in the complex leading to the formation of a new complex.

    • The new complex is (NH4)2[Ce(NO3)5(Ph3PO)] where Ce is surrounded by five NO3- ions and one Ph3PO ligand, leading to a coordination number of 10.

    • Therefore, statement IV is correct.



Therefore, the correct statements are I, III, and IV. Answer is option D.
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Consider the following statements for (NH4)2[Ce(NO3)6] (Z)(I) Coordination number of Ce is 12(II) Z is paramagnetic(III) Z is an oxidizing agent(IV) Reaction of Ph3PO with Z gives a complex having coordination number 10 for Ce.The correct statements area)I, II and IIIb)II, I and IVc)II, III and IVd)I, III and IVCorrect answer is option 'D'. Can you explain this answer?
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