In which complexes does iron have an oxidation state of +3?
[Fe(H2 O)6 ]3+
[Fe(H2 O)5 (CN)]2+
[Fe(CN)6 ]3−
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Which complex is likely to be colourless?
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Part of the spectrochemical series is shown.
I− < Cl − < H2 O < NH3
Which statement can be correctly deduced from the series?
H2 O increases the p–d separation more than Cl -
H2 O increases the d–d separation more than Cl -
A complex with NH3 is more likely to be blue than that with Cl -
Complexes with water are always blue
Choose your answer A B C D
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Ammonia is a stronger ligand than water. Which statement is correct when concentrated aqueous ammonia solution is added to dilute aqueous copper(II) sulfate solution?
The d-orbitals in the copper ion split.
There is a smaller splitting of the d-orbitals.
Ammonia replaces water as a ligand.
The colour of the solution fades.
Choose your answer A B C D
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Cobalt forms the complex [Co(NH3 )5 Cl ]2+ . Which statements are correct for this complex?
The cobalt ion acts as a Lewis acid.
The cobalt ion has an oxidation state of +2.
There are 90° bond angles between the cobalt ion and the ligands.
Choose your answer A B C D
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