d and f BLOCK ELEMENTS

What is the relationship between the E°(M2+/M) values and the reactivity of first-row transition metals with dilute acids?

• Metals with positive E° values react more readily
• There is no relationship
• Metals with more negative E° values react more readily
• E° values only relate to physical properties

Why are many first-row transition metals sufficiently electropositive to dissolve in mineral acids?

• They form covalent bonds with acids
• They have low melting points
• Their negative E°(M2+/M) values indicate a tendency to lose electrons
• They are soft metals

Which of the following first-row transition metals generally does *not* react with 1M H+ ions?

• Titanium (Ti)
• Vanadium (V)
• Iron (Fe)
• Copper (Cu)

Which of the following best explains why the +3 oxidation state is of little importance for Manganese (Mn)?

• Mn3+ is too small
• Mn3+ is too large
• Mn3+ is unstable in water
• The large third ionisation energy required to form Mn3+

Based on E°(M3+/M2+) values, which is a stronger reducing agent, Cr2+ or Fe2+?

• Fe2+
• Cr2+
• They are equally strong
• Cannot be determined