d and f BLOCK ELEMENTS

What is the role of 3d and 4s electrons in the catalytic activity of first-row transition metals?

• They are completely removed
• They form ionic bonds only
• They are utilized for bonding at the catalyst surface
• They are inert and do not participate

Which of the following is an example of a ferrous alloy mentioned in the text?

• Brass
• Bronze
• Duralumin
• Stainless steel

What is the primary reason for the high melting points of interstitial compounds?

• They are purely ionic
• They contain weak van der Waals forces
• The strong interactions and distorted lattice structure require more energy to break
• They have simple molecular structures

Why do interstitial compounds retain metallic conductivity despite incorporating non-metal atoms?

• The interstitial atoms donate free electrons
• They form ionic bonds
• The host metal's delocalized electron sea remains largely intact
• They have a simple crystal structure

What is the significance of the formulas like TiH1.7 or VH0.56 for interstitial compounds?

• They represent simple ionic compounds
• They show whole number ratios
• They indicate stoichiometric ionic compounds
• They indicate non-stoichiometric composition