Adsorption and colloids

If the adsorption is due to the weak vanderwaals forces between the adsorbent and the adsorbate, it is termed as

• Physisorption

• Chemisorption

• Desorption

• Pseudo adsorption

Smoke is a dispersion of __________

• A solid in gas

• A gas in solid

• A gas in gas

• A liquid in gas

In which of the following colloids is the dispersing medium a liquid?

• Mist

• Foam

• Jelly

• shaving cream

Which one of the following is not a colloid?

• Milk

• Mud

• Boric acid

• Butter

Which is an example of a colloid?

• Aqueous solution of NaCl

• Milk

• Water

• Iron

A colloid is a

• homogeneous mixture

• compound

• heterogeneous mixture

• pure substance

What is the process called when the molecules of a substance are retained at the surface of a solid or a liquid?

• Absorption

• Adsorption

• Sorption

• Desorption

In physisorption, the adsorbent does not show specificity towards a particular gas.

• True

• False

Which of the following statements is true with respect to the extent of physisorption?

• Increases with increase in temperature

• Decreases with increase in surface area

• Decreases with increase in the strength of Van der Waals forces

• Decreases with increase in temperature

Which of the following can result in a transition from physisorption to chemisorption?

• Decrease in temperature

• Decrease in pressure

• Increase in surface area

• Increase in temperature