d and f BLOCK ELEMENTS

What type of compounds do transition metals form with non-metals according to the text?

• Only ionic compounds
• Only covalent compounds
• Binary compounds
• Only metallic compounds

Which property listed is associated with the formation of complexes by transition elements?

• High melting points
• Paramagnetic behaviour
• Tendency for the formation of complexes
• Low density

What is the main reason transition elements exhibit variable oxidation states?

• Only ns electrons are involved
• Only (n–1)d electrons are involved
• The availability of (n–1)d and ns electrons for bonding
• Their high electronegativity

Which of the following best describes the chemical reactivity of most first series transition metals towards water?

• They are completely inert
• They react easily
• They only react with steam
• They form protective oxide layers

What is the typical appearance of lanthanum and lanthanoid metals?

• Silver
• White
• Black
• Gold