HARD
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Why activated charcoal is used as an adsorbent in creating high vacuum?

Important Questions on Surface Chemistry

EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation
xm=kp0.5
Adsorption of the gas increases with:
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25o C. For this process, the correct statement is 
MEDIUM
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
10 mL of 1 mM surfactant solution forms a monolayer covering 0.24 cm2 on a polar substrate. If the polar head is approximated as a cube, what is its edge length?
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Give an expression for Freundlich adsorptioin isotherm.
HARD
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

State one relevant observation for the following reactions:

  • Sulphide ore is added to a tank containing oil and water and then stirred or agitated with air.
HARD
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Describe factors affecting adsorption of gases on solids.
MEDIUM
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
What is an adsorption isotherm? Describe Freundlich adsorption isotherm.
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Write the definition of chemical adsorption.
MEDIUM
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour, it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Which one of the following characteristics is associated with adsorption?
HARD
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
What are different types of adsorption? Give any four differences between characteristics of these different types.
 
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
What is the role of activated charcoal in a gas mask?
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
How does chemisorption vary with temperature?
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Which of the following statements is correct for the spontaneous adsorption of a gas?
MEDIUM
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Give three points of difference between physisorption and chemisorption.
MEDIUM
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
When any solid substance is kept in contact with liquid or gas, then liquid or gas are more adsorbed on the surface of solid rather than bulk. The process is known as adsorption. It is different from absorption. Many gaseous reactions occur in the presence of solid catalyst. Catalyst is a chemical substance which change the rate of reaction without undergoing itself change. This phenomenon is known as catalysis.
Write any two differences between Absorption and Adsorption.
 
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Write the definition of adsorption.
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Which one of the following is not a property of physical adsorption?
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
People working in coal mines use activated charcoal in gas mask. Why?
EASY
Chemistry>Physical Chemistry>Surface Chemistry>Adsorption
Function of potassium ethylxanthate in froth floatation process is to make the ore