Coordination Compounds

Question 1

Given below are two statements: Statement-I: [Fe(ox)₃]³⁻ is chiral. Statement-II: trans-[Cr(H₂O)₂(ox)₂]⁻ is chiral. (Given: oxH₂ = HOOC-COOH) In light of the above statements, choose the most appropriate answer from the options given below:

Accepted Answer

Statement-I is correct but Statement-II is incorrect. A tris-chelate like [Fe(ox)₃]³⁻ has no plane of symmetry and exists as two non-superimposable mirror images, so it is chiral. The trans isomer of [Cr(H₂O)₂(ox)₂]⁻ does have a plane of symmetry, which makes it achiral — only the cis form of that complex is optically active.

Answer

Both Statement-I and Statement-II are correct

Answer

Both Statement-I and Statement-II are incorrect

Answer

Statement-I is incorrect but Statement-II is correct

Question 2

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

Accepted Answer

CO > NH₃ > H₂O > Cl⁻. This is the spectrochemical series. CO is the strongest field ligand of the four because it accepts electron density into its empty π* orbitals; ammonia is a stronger field ligand than water because nitrogen is the better donor; and chloride is the weakest. So CO > NH₃ > H₂O > Cl⁻.

Answer

CO > H₂O > NH₃ > Cl⁻

Answer

Cl⁻ > H₂O > NH₃ > CO

Answer

Cl⁻ > NH₃ > H₂O > CO

Question 3

Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

Accepted Answer

[Mn(CN)₆]³⁻. All four are strong-field octahedral complexes, so the electrons pair up as far as possible. Mn³⁺ is d⁴ and low-spin, leaving 2 unpaired electrons; Fe³⁺ is d⁵ low-spin with 1; Co³⁺ is d⁶ low-spin with none; Ti³⁺ is d¹ with 1. Two unpaired electrons gives the largest spin-only moment.

Answer

[Fe(CN)₆]³⁻

Answer

[Co(NH₃)₆]³⁺

Answer

[Ti(H₂O)₆]³⁺

Q1.Given below are two statements: Statement-I: [Fe(ox)₃]³⁻ is chiral. Statement-II: trans-[Cr(H₂O)₂(ox)₂]⁻ is chiral. (Given: oxH₂ = HOOC-COOH) In light of the above statements, choose the most appropriate answer from the options given below:

Q2.According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

Q3.Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)