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CHM1022 - Chemistry II - S2 2025
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What is the correct systematic name for the compound [Co(NH3)4(OH2)2]Cl3?
Out of the following complexes [Fe(OH2)6]Cl2 and [Fe(OH2)6]Cl3, which one is more acidic and why?
a) [Fe(OH2)6]Cl2, because Fe²⁺ has a lower charge density and polarises water molecules more strongly.
b) [Fe(OH2)6]Cl2, because Fe²⁺ has a higher charge density and releases protons easily.
c) [Fe(OH2)6]Cl3, because Fe³⁺ has a higher charge density and polarises water molecules more strongly, weakening the O–H bond.
d) [Fe(OH2)6]Cl3, because Fe³⁺ has a lower charge density and thus makes the solution acidic.
How many step-wise equilibrium processes are there for the displacement of six aqua ligands by three ethylenediamine (en) ligands around an octahedral metal ion?
The overall equation is:
[M(OH2)6]n++ 3 en ⟶ [M(en)3]n+ + 6 H2O
Which of the following molecules could NOT act as a ligand?
Indicate which of the following reagents have a MEDIUM risk.