Q73 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Colloids Micelles · Marks: 2 · Difficulty: Easy

An intense purple colour (Plasmon band) is exhibited by a colloid consisting of spherical
(a)silver particles of 10 mm diameter
(b)silicon particles of 5 mm diameter
(c)gold particles of 5 nm diameter
(d)iron particles of 3 mm diameter
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
The surface plasmon band of nanometre-sized gold particles gives the purple/red colours; millimetre particles show no plasmon absorption.

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