NEET Chemistry Surface Chemistry Questions Solved

BOARD

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.

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