Chemistry · Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure
Colloidal solutions of gold, prepared by different methods are of different colo
Colloidal solutions of gold, prepared by different methods are of different colours because of:
- A. variable valency of gold
- B. different concentration of gold particles
- C. impurities produced by different methods
- D. different diameters of colloidal gold particles
Step-by-step solution
The color of colloidal gold solutions arises from surface plasmon resonance, which depends strongly on the size (diameter) of the gold nanoparticles. Different preparation methods yield particles of varying diameters, leading to different observed colors. Concentration affects only intensity, not the color itself, while valency and impurities are not the primary cause.
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