d and f BLOCK ELEMENTS

Which of the following is a characteristic property of the f-block elements that directly results from the filling of f orbitals?

• High melting points
• Paramagnetism
• Lanthanoid contraction
• Variable oxidation states

How many complete series of transition elements are recognized based on d-orbital filling?

• One
• Two
• Three
• Four

What property of silver bromide (AgBr) makes it crucial for traditional black-and-white photography?

• Its bright yellow color
• Its solubility in water
• Its light-sensitive decomposition to metallic silver
• Its high melting point

What is the main industrial source of the ore used to prepare potassium permanganate?

• Bauxite
• Galena
• Pyrolusite
• Cassiterite

Which factor primarily contributes to the variable oxidation states exhibited by transition elements?

• High electronegativity
• Low ionization energies
• Similar energies of (n-1)d and ns orbitals allowing loss of different numbers of electrons
• Large atomic sizes