d and f BLOCK ELEMENTS

For which industry is TiO specifically mentioned as being used?

• The pharmaceutical industry
• The electronics industry
• The steel industry
• The pigment industry

What is the foundational basis for the production of iron and steel according to the text?

• Melting pure iron and casting
• Adding large amounts of carbon only
• Reduction of iron oxides, removal of impurities, and addition of carbon and alloying metals.
• Electrolysis of iron ore

What is a primary use of MnO2 as mentioned in the text?

• As a catalyst
• As a pigment
• In steel production
• In dry battery cells

Which lanthanoid is specifically mentioned as commonly exhibiting the +4 oxidation state?

• Europium
• Ytterbium
• Lanthanum
• Cerium

Why is the lanthanoid contraction considered more important than the actinoid contraction currently?

• Lanthanoid contraction is physically larger.
• Actinoid contraction affects fewer elements.
• The chemistry of elements succeeding actinoids is less known.
• Lanthanoid contraction was discovered first.