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Question
Which of the following phenomenon occurs when a chalk stick is dipped in ink?
(i) Adsorption of coloured substance.
(ii) Adsorption of solvent.
(iii) Absorption and adsorption both of solvent.
(iv) Absoprtion of solvent.
Solution
(i) Adsorption of coloured substance.
(iv) Absoprtion of solvent.
Explanation:
When a chalk stick is dipped in ink, the surface retains the colour of the ink due to adsorption of coloured molecules while the solvent of the ink goes deeper into the stick due to absorption.
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