Quiz on Colloidal Dispersions

What is the size range of colloidal dispersions?

• 1 um to 500 um

• All of the above

• Less than 1 um

• Greater than 500 um

Which type of colloid is characterized by having a high affinity for the solvent?

• Lyophobic colloids

• Lyophilic colloids

• Coarse dispersions

• Molecular dispersions

What is the primary method to prepare lyophobic colloids?

• Mixing with water

• Dissolving in solvent

• Heating

• Ultrasonic generator

Which of the following is an example of a lyophilic colloid?

• Sulfur sol

• Acacia in water

• Silver iodide

• Gold sol

What is the Tyndall effect associated with?

• Sedimentation rate

• Viscosity measurement

• Brownian motion

• Light scattering

Which property of colloids is affected by the shape of the particles?

• Viscosity

• Brownian motion

• Osmotic pressure

• All of the above

What happens to lyophobic colloids when electrolytes are added?

• They become more stable

• They precipitate easily

• They dissolve completely

• They form reversible sols

Which of the following is NOT a method for purifying colloids?

• Centrifugation

• Ultra filtration

• Electro dialysis

• Dialysis

What is the role of amphiphiles in association colloids?

• To increase viscosity

• To stabilize the colloid

• To form micelles

• To reduce particle size

Which of the following is a pharmaceutical application of colloids?

• Colloidal copper for filtration

• Colloidal gold for diagnostics

• Colloidal silver for precipitation

• Colloidal sulfur for emulsification