d and f BLOCK ELEMENTS

What is the relationship between the highest oxidation number in transition metal oxides and the group number of the element?

• The highest oxidation number is always one less than the group number
• The highest oxidation number coincides with the group number
• The highest oxidation number is always two more than the group number
• There is no consistent relationship

How does the acidic character of transition metal oxides change as the oxidation number of the metal increases?

• Acidic character decreases
• Acidic character becomes predominant
• Acidic character remains unchanged
• Acidic character becomes neutral

What is the primary product formed when the basic oxide CrO reacts with an acid?

• A salt containing Cr3+ ions
• A salt containing Cr2+ ions
• Chromate ions (CrO4 2-)
• Dichromate ions (Cr2O7 2-)

Which of the following best describes the behavior of Cr2O3 when reacting with both acids and bases?

• It is purely basic
• It is purely acidic
• It is amphoteric
• It is neutral and unreactive

What is the general trend in the melting points of higher transition metal oxides like CrO3 and V2O5?

• They tend to have very high melting points
• They tend to have low melting points
• Melting points remain constant regardless of oxidation state
• They tend to sublime directly from solid to gas