d and f BLOCK ELEMENTS

What is the typical appearance of freshly prepared potassium dichromate crystals?

• Pale yellow
• Blue
• Orange-red
• Green

What is the main characteristic of the f-block elements that distinguishes them from other blocks?

• High radioactivity
• Progressive filling of f orbitals
• Gaseous state at room temperature
• High electronegativity

What property allows transition metals to form interstitial compounds according to the text?

• Large atomic radii
• Low density
• Tendency for the formation of interstitial compounds
• High volatility

What is the general reactivity of copper compared to other first series transition metals according to the text?

• It is the most reactive
• It is the least reactive
• It is relatively unreactive (noble)
• Its reactivity is average

What type of compounds are formed when transition metal oxides react with bases according to the text?

• Only water
• Hydrogen gas
• Oxometallic salts
• Metallic hydrides