d and f BLOCK ELEMENTS

What type of bonding is characteristic of interstitial compounds?

• Purely ionic
• Purely covalent
• Metallic only
• Neither typically ionic nor covalent

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

• They have high melting points
• They are very hard
• They retain metallic conductivity
• They are typically ionic or covalent

What are interstitial compounds primarily formed from?

• Large atoms replacing metal atoms
• Small atoms trapped in metal crystal lattices
• Only hydrogen atoms
• Metal atoms bonded covalently

In the catalysed reaction between iodide and persulphate ions, what happens to iron(II) ions?

• They oxidize iodide ions
• They reduce persulphate ions
• They form a complex with iodine
• They precipitate out

In the catalysed reaction between iodide and persulphate ions, what role does iron(III) play initially?

• It is oxidized by iodide ions
• It is reduced by iodide ions
• It forms a precipitate
• It acts as a spectator ion