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CHM1022 - Chemistry II - S2 2025
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Which complex will absorb light of longest wavelength (lowest energy)? a) [Cr(OH₂)₆]³⁺ b) [Cr(NH₃)₆]³⁺ c) [Cr(CN)₆]³⁻ d) [CrF₆]³⁻
Which complex is expected to be colourless? a) [Zn(OH₂)₆]²⁺ b) [Ti(OH₂)₆]³⁺ c) [Cr(OH₂)₆]³⁺ d) [Fe(OH₂)₆]²⁺
Calculate the spin only magnetic moment (μSO = √n(n+2)) of the following coordination complex [Co(NH3)6]Br2
Which of the following pairs of complexes show different magnetic behaviour? A) [CoF₆]³⁻ and [Co(NH₃)₆]³⁺ B) [Fe(OH₂)₆]³⁺ and [FeF₆]³⁻ C) [Ni(OH₂)₆]²⁺ and [Ni(NH₃)₆]²⁺ D) [Cu(OH₂)₆]²⁺ and [Cu(NH₃)₄]²⁺
What causes a coordination complex to change colour?
Which of the following complexes is diamagnetic?
a) [Co(OH2)6]3+b) [Mn(CN)6]3-c) [Fe(CN)6]4-d) [Fe(CN)6]3-
Rank the following ligands in terms of increasing Δoct: Bromide, carbonyl, cyanide, ethylenediamine (en), oxalate (ox), κN-thiocyanate
If the metal complex in Question 1 undergoes a reaction and turns yellow, what has happened to the size of Δoct?
Reminder of Question 1. A metal complex absorbs light in the red region of the spectrum. What colour does it appear to be?
If a complex had a λmax = 650 nm, which is the value for Δoct?
E = hc/λ
h = 6.626 x 10-34 J.s
c = 2.998 x 108 m s-1
NA = 6.023 x 1023 mol-1