d and f BLOCK ELEMENTS

Based on the provided E° values, which statement is true regarding the stability of Fe3+ compared to Mn3+ in acidic solution?

• Fe3+ is less stable than Mn3+
• Fe3+ is more stable than Mn3+
• They are equally stable
• Stability cannot be determined

In the M2+/M redox couple, which metal has the most negative standard electrode potential (E°) value listed?

• Chromium (Cr)
• Iron (Fe)
• Manganese (Mn)
• They are all equally negative

In the M3+/M2+ redox couple, which metal has the highest standard electrode potential (E°) value listed?

• Chromium (Cr)
• Iron (Fe)
• Manganese (Mn)
• All have similar values

Which of the following transition metal ions is most likely to be coloured in aqueous solution based on its d-electron count?

• Sc3+ (d0)
• Cu+ (d10)
• Ti3+ (d1)
• Zn2+ (d10)

What is the typical colour of a Sc3+ aqueous solution?

• Violet
• Green
• Yellow
• Colourless