d and f BLOCK ELEMENTS

Which of the following best explains the increasing oxidising power in the series VO2+ < Cr2O72- < MnO4-?

• Decreasing reduction potential
• Increasing stability of the lower species formed
• Decreasing atomic radius
• Increasing electronegativity

What is the typical geometry of the [MO4]n- ions mentioned in the text?

• Octahedral
• Square planar
• Tetrahedral
• Linear

Which of the following oxides is primarily ionic in nature?

• Mn2O7
• CrO3
• V2O5
• FeO

What is the typical colour of the Cr3+ ion in aqueous solution?

• Yellow
• Orange
• Green
• Purple

Why is the +3 oxidation state relatively stable for Scandium?

• It forms strong covalent bonds
• It achieves a noble gas configuration
• It has a high ionisation enthalpy
• It is paramagnetic