d and f BLOCK ELEMENTS

Why is the formation of a homogeneous solid solution alloy favored when the metallic radii of the components are similar?

• Similar sizes increase electrical conductivity
• Similar sizes ensure identical chemical properties
• Similar sizes minimize lattice strain energy
• Similar sizes make the metals liquid

What is the main difference between brass and bronze in terms of their alloy composition?

• Brass contains lead, bronze does not
• The primary non-copper metal: Zinc in brass, Tin in bronze
• Brass is harder than bronze
• Bronze is a ferrous alloy, brass is not

What is the primary reason interstitial compounds like TiC and Mn₄N are chemically inert?

• They lack electrons
• They are purely ionic
• The strong interactions between the metal and the interstitial atom create a stable structure
• They are noble metals

Which of the following is NOT a characteristic property of interstitial compounds?

• High melting points
• Chemical inertness
• Low melting points
• Very high hardness

What is the nature of the bond formed in typical interstitial compounds?

• Purely ionic
• Purely covalent
• Metallic only
• Intermediate, neither purely ionic nor covalent