Describe the following:
(i) Tyndall effect
(ii) Shape-selective catalysis
(i) Tyndall effect: When a beam of light is passed through a colloidal
solution and viewed perpendicular to the path of the incident light,
the path of light becomes visible as a bright streak. The illuminated path
is called Tyndall cone and the phenomenon is called Tyndall effect.
(ii) Shape-selective catalysis: The catalyst reaction in which small
sized molecules are absorbed in the pores and cavities of selective
adsorbents like zeolites is known as shape selective catalysis.