Q116 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Colloids Micelles · Marks: 2 · Difficulty: Medium

Michael Faraday observed that the colour of colloidal suspensions of gold nanoparticles changes with the size of the nano particles. This is because
(a)gold forms complex with the solvent
(b)band gap of gold changes with size of the nanoparticle
(c)gold in nanocrystalline form undergoes transmutation to other elements
(d)colloidal suspensions diffract light
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Quantum confinement: the electronic band structure (band gap/plasmon resonance) of gold changes with particle size, so the absorbed colour changes.

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