d and f BLOCK ELEMENTS

What is the oxidation state of Iron in Fe2O3?

• +2
• +3
• +4
• +6

What is the oxidation state of Manganese in MnO2?

• +2
• +3
• +4
• +6

What is the oxidation state of Chromium in CrO3?

• +3
• +4
• +5
• +6

Which of the following best explains why Cu+ is often unstable in aqueous solution?

• It is easily oxidised by water
• It disproportionate to Cu2+ and Cu
• It forms insoluble hydroxides
• It has a high ionisation enthalpy

What is the main product when ferrates(VI) (FeO4)2- decompose in aqueous solution?

• FeO
• Fe3O4
• Fe2O3
• Fe