d and f BLOCK ELEMENTS

What is the main characteristic that distinguishes inner transition elements from transition elements?

• Higher atomic masses
• Radioactivity
• Filling of inner f orbitals rather than d orbitals
• Liquid state at room temperature

Which process involves the use of a PdCl2 catalyst for the oxidation of acetylene to acetaldehyde?

• Haber process
• Contact process
• Wacker process
• Ostwald process

What is the primary reason transition metal ions often form colored solutions?

• They reflect all wavelengths equally
• They absorb all wavelengths equally
• Absorption of specific visible light wavelengths due to d-orbital splitting
• They emit light through phosphorescence

Which transition metal is essential for the biological function of hemoglobin in oxygen transport?

• Copper
• Cobalt
• Iron
• Manganese

What is the main consequence of the lanthanoid contraction on the chemistry of elements following the lanthanoid series?

• It increases the reactivity of all subsequent elements
• It decreases the melting points of subsequent elements
• It makes the properties of 4d and 5d series elements more similar
• It eliminates variable oxidation states