d and f BLOCK ELEMENTS

What physical property change is observed along the lanthanoid series due to lanthanoid contraction?

• Gradual increase in atomic and ionic sizes
• Gradual decrease in atomic and ionic sizes
• No significant change in atomic and ionic sizes
• Erratic changes in atomic and ionic sizes

What is the principal oxidation state exhibited by lanthanoids?

• +1
• +2
• +3
• +4

Which of the following ions are described as strong oxidising agents in the text?

• Only dichromate ions
• Only permanganate ions
• Both dichromate and permanganate ions
• Neither ion

What is the primary ore used for the preparation of potassium permanganate?

• Bauxite
• Galena
• Pyrolusite
• Cinnabar

What is generally formed when first series transition metal oxides react with acids?

• Hydrogen gas
• Pure metals
• Oxometallic salts
• Only water