Elementary concepts of adsorption — physisorption and chemisorption; Freundlich adsorption isotherm; colloids — types, methods of preparation and general properties; emulsions, surfactants and micelles (definitions and examples).
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Q1 · Surface Chemistry · EASY
Which of the following statements is correct regarding physical adsorption?
Q2 · Surface Chemistry · EASY
Which of the following is an example of positive adsorption according to the Freundlich adsorption isotherm?
Q3 · Surface Chemistry · HARD
When nitrogen gas is adsorbed on a tungsten surface at two different temperatures T₁ = 400 K and T₂ = 600 K, the extent of adsorption (x/m) at a pressure of 2 atm was found to be 0.15 g/g and 0.08 g/g respectively. Which of the following statement(s) is/are TRUE regarding this adsorption process?
Q4 · Surface Chemistry · MEDIUM
A freshly prepared precipitate of Fe(OH)₃ is peptized by adding dilute FeCl₃ solution. The resulting colloidal particles will carry: