Quiz for Colloids

Q1: Colloidal particles are in the size range of:

A. 1–100 nm B. 0.001–0.01 nm C. 100–1000 nm D. 1–10 cm

Q2: The dispersion medium in fog is:

A. Gas B. Liquid C. Solid D. Plasma

Q3: Tyndall effect is shown by:

A. True solutions B. Colloids C. Suspensions D. All of these

Q4: Which of the following is a lyophilic colloid?

A. Ferric hydroxide B. Gold sol C. Gelatin D. Arsenic sulfide

Q5: Which of the following can act as protective colloid?

A. Starch B. NaCl C. HCl D. BaCl₂

Q6: Which method is used to purify colloids?

A. Crystallization B. Electrophoresis C. Centrifugation D. Dialysis

Q7: Which property is responsible for the stability of sols?

A. Surface tension B. Viscosity C. Charge on particles D. Diffusion

Q8: Coagulation of colloids is brought about by:

A. Heating B. Cooling C. Addition of electrolytes D. Dilution

Q9: Gold sol is an example of:

A. Lyophilic sol B. Lyophobic sol C. True solution D. Suspension

Q10: Peptization is a process of:

A. Precipitation of sol B. Purification of sol C. Converting precipitate to sol D. Mixing of liquids

Q11: The movement of colloidal particles under an electric field is called:

A. Electrolysis B. Electrophoresis C. Electroplating D. Electrocoagulation

Q12: Sol is a colloidal system of:

A. Solid in solid B. Solid in liquid C. Solid in gas D. Liquid in solid

Q13: Smoke is an example of:

A. Solid in liquid B. Liquid in gas C. Solid in gas D. Gas in gas

Q14: Which property of colloids makes them scatter light?

A. Brownian motion B. Surface tension C. Tyndall effect D. Electrophoresis

Q15: Milk is an example of:

A. Emulsion B. Sol C. Gel D. Suspension

Q16: Which of the following will coagulate negatively charged sol?

A. NaCl B. MgCl₂ C. AlCl₃ D. BaCl₂

Q17: Brownian motion in colloids is due to:

A. Electrical charge B. Gravity C. Collision with solvent molecules D. Magnetism

Q18: Which of the following statements is incorrect?

A. Colloids are homogeneous B. Colloids show Tyndall effect C. Colloids are stable D. Colloids exhibit Brownian movement

Q19: Zeta potential refers to:

A. Charge on colloid particles B. Potential difference at slipping plane C. Voltage applied D. Surface tension