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Chemistry
JAMB 2026
1. Which of the following is the correct order of particle size?
A. True Solution < Colloid < Suspension
B. Suspension < Colloid < True Solution
C. Colloid < True Solution < Suspension
D. True Solution < Suspension < Colloid
2. A mixture of starch in water is best described as:
A. A true solution
B. A suspension
C. A colloidal sol
D. An emulsion
3. In which of the following is the "Host" (Dispersion Medium) a solid and the "Guest" (Dispersed Phase) a liquid?
A. Smoke
B. Cheese
C. Milk
D. Whipped cream
4. The formation of a delta at a river mouth where it meets the sea is an application of:
A. Dialysis
B. Electrophoresis
C. Coagulation
D. Tyndall effect
5. Which of these will NOT pass through a semi-permeable membrane but WILL pass through filter paper?
A. Sodium Chloride solution
B. Muddy water
C. Gold Sol
D. Copper (II) sulphate solution
6. Smoke and Fog are both aerosols. What is the difference between them?
A. Smoke is liquid in gas; Fog is solid in gas
B. Smoke is solid in gas; Fog is liquid in gas
C. Smoke is gas in solid; Fog is gas in liquid
D. Both are identical in phase
7. Which of the following is a "Liquid in Liquid" system?
A. Hair Gel
B. Cod liver oil
C. Pumice stone
D. Dust
8. The scattering of a beam of light by colloidal particles is known as:
A. Brownian motion
B. Electrophoresis
C. Tyndall effect
D. Peptization
9. Why is a Gas-in-Gas mixture not a colloid?
A. Because gas particles are too small
B. Because they form a homogeneous solution
C. Because gases cannot be dispersed
D. Because they are invisible
10. Which of these ions is most effective in coagulating a negatively charged Arsenic (III) sulphide sol?
A. Na^+
B. Mg^{2+}
C. Al^{3+}
D. K^+
11. An emulsion is stabilized by the addition of:
A. An electrolyte
B. An emulsifier
C. A catalyst
D. A solvent
12. Butter is an example of:
A. A sol
B. A gel
C. A foam
D. A solid sol

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