alleryA chalk stick dipped in ink keeps ink colour on its surface by:
AAbsorption
BDesorption
CRefraction
DAdsorption
Answer & Solution
Correct answer: D. Adsorption
1. The coloured molecules stay on the outside of the stick.
2. The solvent of the ink goes deeper in instead.
3. So the colour is held by adsorption, the solvent by absorption.
_Source: syllabus Chemistry Part I, Chapter 5, Surface Chemistry._
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