d and f BLOCK ELEMENTS

Which transition metal oxide, besides Mn2O7 and CrO3, is mentioned as having a low melting point?

• Fe2O3
• TiO2
• V2O5
• Sc2O3

What type of salts does V2O4 form when it dissolves in acids?

• VO4 3– salts
• VO2+ salts
• V2O5 salts
• VO3 - salts

Which of the following statements best describes the stability of Sc2O3 compared to higher oxides of elements beyond group 7 like iron?

• Both are equally stable
• Sc2O3 represents the highest oxidation state for Sc, while higher oxides are not known for elements beyond group 7
• Sc2O3 is less stable than higher oxides of iron
• Sc2O3 is unstable compared to all other transition metal oxides

What is the predominant character of the higher oxides of transition elements like Mn2O7, CrO3, and V2O5?

• Basic character
• Amphoteric character
• Neutral character
• Acidic character

What is the highest oxidation number observed in the oxides of transition elements discussed, and which element achieves it?

• +6, achieved by Chromium in CrO3
• +7, achieved by Manganese in Mn2O7
• +8, achieved by Ruthenium in RuO4
• It varies unpredictably