d and f BLOCK ELEMENTS

Which transition metal compound is primarily responsible for the blue color in sapphires?

• Copper compounds
• Chromium compounds
• Titanium and iron compounds
• Cobalt compounds

What is the main reason why many transition metal compounds exhibit paramagnetism?

• Fully filled d orbitals
• Large atomic masses
• Presence of unpaired electrons in d orbitals
• High melting points

Why do transition metals generally have higher melting points than s-block metals?

• Larger atomic radii
• Weaker interatomic forces
• Stronger metallic bonding due to involvement of d electrons
• Higher electronegativity

What is the primary function of nickel in the hydrogenation of fats in the food industry?

• To act as a solvent
• To provide iodine atoms
• To provide a surface for the reaction and facilitate hydrogen addition
• To increase the temperature

Which property of transition metals allows them to form alloys with unique combinations of strength and ductility?

• Ionic bonding
• Covalent network bonding
• Metallic bonding involving delocalized d and s electrons
• Hydrogen bonding