d and f BLOCK ELEMENTS

What is the main source of the paramagnetic behaviour of transition elements?

• Paired (n–1)d electrons
• Fully filled s orbitals
• Unpaired (n–1)d electrons
• Large atomic nuclei

What is the main source of the catalytic properties of transition elements according to the text?

• High atomic mass
• Low ionization energy
• Involvement of (n–1)d electrons
• Large atomic size

Which property listed is NOT typically associated with transition elements?

• Variable oxidation states
• Catalytic properties
• High melting points
• Forming exclusively ionic bonds

What is the colour characteristic often associated with transition metal ions in solution?

• Always colourless
• Always white
• Coloured
• Always black

How is potassium dichromate prepared from chromite ore according to the text?

• Direct reaction with sulfuric acid
• Reduction with hydrogen
• Fusion with alkali in presence of air and acidifying the extract
• Electrolysis of chromite