1. An emulsion is a colloidal system of:
a) Gas in a liquid
b) Liquid in a liquid
c) Liquid in a gas
d) Gas in a solid
Answer: b
2. Which of the following is NOT an example of an emulsion?
a) Chocolate milk
b) Butter
c) Whipped cream
d) Curd
Answer: d
3. A colloid with a liquid dispersed in another liquid is known as:
a) Gel
b) Emulsion
c) Sol
d) Precipitate
Answer: b
4. Isotonic solutions have the same:
a) Vapour pressure
b) Osmotic pressure
c) Boiling point
d) Freezing point
Answer: b
5. In the reaction A + B → C + D, a first-order reaction can be confirmed by:
a) Increasing product concentration
b) Increasing reactant concentration
c) Increasing temperature
d) Adding a catalyst
Answer: b
6. Fog, cloud, and mist are examples of:
a) Aerosol
b) Solid sol
c) Foam
d) Gel
Answer: a
7. Assertion: Chemical reactions proceed faster at higher temperatures.
Reason: Molecular motion increases with temperature.
a) Both A and R are true; R explains A
b) Both A and R are true; R does not explain A
c) A is true; R is false
d) A is false; R is true
Answer: a
8. Colloidal particles suspended in water can be removed by:
a) Filtration
b) Absorption
c) Adsorption
d) Coagulation
Answer: d
9. A solution is best described as:
a) A homogeneous mixture of two or more substances
b) A solid dissolved in a liquid
c) A solid dissolved in water
d) A mixture of two liquids
Answer: a
10. In electro-refining, pure metal is deposited on the:
a) Cathode
b) Anode
c) Vessel
d) Electrolyte
Answer: a
11. The unit of ionic product of water (Kw) is:
a) mol² L⁻¹
b) mol² L⁻²
c) mol⁻¹ L²
d) mol⁻¹ L⁻¹
Answer: b
12. The unit of specific conductivity is:
a) Ohm·cm⁻¹
b) Ohm·cm⁻²
c) Ohm⁻¹·cm
d) Ohm⁻¹·cm⁻¹
Answer: d
13. The enzyme that helps convert milk to curd is:
a) Pepsin
b) Invertase
c) Lactase
d) Diastase
Answer: c
14. A catalyst alters the:
a) Potential energy of reactants
b) Kinetic energy of reactants
c) Potential energy of products
d) Activation energy of the reaction
Answer: d
15. Degree of dissociation of an electrolyte depends on:
a) Atmospheric pressure
b) Dissolution method
c) Dilution
d) Impurities
Answer: c
16. The acid commonly present in lead batteries is:
a) Hydrochloric acid
b) Sulphuric acid
c) Acetic acid
d) Nitric acid
Answer: b
17. Which non-metal exhibits allotropy in the liquid state?
a) Carbon
b) Sulphur
c) Phosphorus
d) Bromine
Answer: b
18. Blood can be purified using:
a) Dialysis
b) Electro-osmosis
c) Coagulation
d) Filtration
Answer: a
19. Strong electrolytes are substances that:
a) Readily dissolve in water
b) Conduct electricity well
c) Dissociate completely into ions even at high concentration
d) Dissociate only at high dilution
Answer: c
20. The relationship between specific heats of gases is:
a) Cp – Cv = R
b) Cp – Cv = R
c) Cp/Cv = R
d) Cp + Cv = R
Answer: b
21. Electrolysis of CuSO₄ using copper electrodes yields:
a) Copper at cathode and oxygen at anode
b) Copper at anode and oxygen at cathode
c) Copper dissolves from anode and deposits at cathode
d) Hydrogen at cathode and oxygen at anode
Answer: c
22. The gas constant R in erg mol⁻¹ K⁻¹ is:
a) 8.314 × 10⁷
b) 8.341 × 10⁷
c) 8.413 × 10⁷
d) 4.183 × 10⁷
Answer: a
23. Heating ammonium chloride with sodium hydroxide in a test tube is an example of:
a) Open system
b) Closed system
c) Isobaric system
d) Isothermal system
Answer: a
24. Which of the following is NOT an example of a gel?
a) Cheese
b) Milk
c) Facial cream
d) None of the above
Answer: d