d and f BLOCK ELEMENTS

How are alloys primarily formed?

• By mixing metals
• By mixing metals and non-metals exclusively
• By chemical reaction between elements
• By electrolysis

Which of the following is an example of an interstitial compound?

• NaCl
• TiC
• H₂O
• CO

What is the typical stoichiometry of interstitial compounds?

• Always 1:1
• Always whole number ratios
• Non-stoichiometric
• Ionic ratios

What is a key reason interstitial compounds retain metallic conductivity?

• The interstitial atoms provide free electrons
• They form ionic bonds
• The host metal's delocalized electrons remain mobile
• They have a simple crystal structure

Why are interstitial compounds generally very hard?

• They are purely ionic
• They contain only metallic bonds
• The trapped small atoms distort the metal lattice, creating strong internal stresses
• They have low melting points