d and f BLOCK ELEMENTS

What is the common oxidation state exhibited by Lanthanoids?

• +1
• +2
• +3
• Variable

What is the primary product formed when acidified potassium permanganate (KMnO4) solution reacts with oxalic acid (H2C2O4)?

• Carbon monoxide (CO)
• Methane (CH4)
• Carbon dioxide (CO2)
• Ethylene (C2H4)

What is the primary product formed when acidified potassium permanganate (KMnO4) solution reacts with sulfur dioxide (SO2)?

• Sulfur trioxide (SO3)
• Sulfur (S)
• Sulfuric acid (H2SO4)
• Hydrogen sulfide (H2S)

What is the primary product formed when acidified potassium permanganate (KMnO4) solution reacts with iron(II) ions (Fe2+)?

• Iron metal (Fe)
• Iron(III) ions (Fe3+)
• Iron(II) hydroxide (Fe(OH)2)
• Iron(II) oxide (FeO)

Why is the chemistry of Actinoid elements generally less smooth than that of Lanthanoids?

• Actinoids are all radioactive.
• Lanthanoids have more stable isotopes.
• Actinoids exhibit a much wider range of oxidation states compared to Lanthanoids.
• Actinoids are artificially produced.