By Shiv Shiv

Class 12 Chemistry MCQs: Top 50 Questions for CBSE Board Exam

Boost your CBSE board exam preparation with this comprehensive online quiz by Sone Publication. This practice test features 50 high-yield Multiple Choice Questions (MCQs) mapped directly from the latest NCERT Class 12 Chemistry textbook. It covers 10 critical questions from each of the first five chapters to help you score 100% in your term exams.

Chapter 1: Solutions MCQ Practice Test

Chapter 2: Electrochemistry MCQ Practice Test

Chapter 3: Chemical Kinetics MCQ Practice Test

Chapter 4: d and f-Block Elements MCQ Practice Test

Chapter 5: Coordination Compounds MCQ Practice Test

Class XII Chemistry – 50 CBSE MCQs

CBSE Class XII Chemistry

50 High-Yield MCQs | Chapters 1-5 (NCERT Syllabus Pattern)

Chapter 1: Solutions

1. Which of the following liquid pairs shows a positive deviation from Raoult’s law?

Water – Nitric acid Ethanol – Acetone Chloroform – Acetone Benzene – Toluene

2. Which of the following concentration terms is independent of temperature?

Molarity Normality Molality Formality

3. Colligative properties depend on:

The number of solute particles The nature of solute particles The nature of the solvent The concentration of the solvent

4. An isotonic solution has the same:

Vapor pressure Boiling point Freezing point Osmotic pressure

5. What is the Van’t Hoff factor (i) for a completely dissociated BaCl₂ solution?

2 3 1 4

6. Scuba divers carry oxygen cylinders diluted with Helium to avoid a painful medical condition called:

Hypoxia Anoxia Bends Asphyxiation

7. According to Henry’s Law, the solubility of a gas in a liquid is directly proportional to the:

Partial pressure of the gas Temperature of the liquid Volume of the liquid Density of the gas

8. Values of Henry’s constant K_H:

Increases with increase in temperature Decreases with increase in temperature Remains constant First increases then decreases

9. Maximum boiling azeotropes are formed by those binary solutions which show:

Ideal behavior Large positive deviation from Raoult’s law Large negative deviation from Raoult’s law No deviation from Raoult’s law

10. The relative lowering of vapor pressure is equal to:

Mole fraction of solvent Mole fraction of solute Molality of solution Molarity of solution

Chapter 2: Electrochemistry

11. The unit of molar conductivity (Λ_m) is:

S cm² mol^-1 S cm^-1 mol^-1 S cm² mol Ω cm² mol^-1

12. During the electrolysis of aqueous NaCl solution, the product obtained at the cathode is:

Na metal Cl₂ gas O₂ gas H₂ gas

13. With dilution, specific conductance (cell conductivity κ) always:

Increases Remains constant Decreases First increases then decreases

14. Kohlrausch’s law is applicable to find limiting molar conductivity of:

Only strong electrolytes Both weak and strong electrolytes Only weak electrolytes Non-electrolytes

15. The cell used in Apollo space programs was a:

Leclanche cell Lead storage battery Mercury cell H₂-O₂ Fuel cell

16. The charge required to reduce 1 mole of MnO₄^– to Mn²⁺ is:

1 F 3 F 5 F 7 F

17. Rusting of iron is catalyzed by which of the following?

Fe H⁺ Zn O₂

18. Cell constant of a conductivity cell is represented by:

l / A A / l R * κ l * A

19. Standard electrode potential for Hydrogen electrode is taken as:

0.00 V 1.00 V -1.00 V 0.11 V

20. Which dynamic formula accurately links Gibbs Free Energy change to E^o_cell?

ΔG^o = nFE^o_cell ΔG^o = -nFE^o_cell ΔG^o = -RT ln E^o_cell ΔG^o = nF / E^o_cell

Chapter 3: Chemical Kinetics

21. The unit of rate constant for a zero-order reaction is:

s^-1 mol L^-1 s^-1 L mol^-1 s^-1 L² mol^-2 s^-1

22. If the initial concentration of reactant is doubled, the half-life period of a zero-order reaction:

Doubles Is halved Remains unchanged Becomes triple

23. The order of a radioactive decay process is always:

Zero Second First Fractional

24. What cannot be zero for any chemical reaction?

Order of reaction Half-life period Molecularity ΔH of reaction

25. A catalyst alters which of the following parameters in a chemical reaction?

Activation energy Gibbs free energy Enthalpy change Equilibrium constant

26. Temperature coefficient value for most reactions lies between:

1 and 2 3 and 4 0 and 1 2 and 3

27. Acidic hydrolysis of ethyl acetate is an example of:

Zero-order reaction Pseudo first-order reaction Second-order reaction Third-order reaction

28. The plot of ln k vs 1/T yields a straight line with a slope equal to:

-E_a / R E_a / R -E_a / 2.303R A / R

29. The rate-determining step in a complex reaction mechanism is always the:

Fastest step Moderately fast step Slowest step First step

30. For a first-order reaction, the time required for 99.9% completion is approx. how many times its t_1/2?

2 times 5 times 10 times 100 times

Chapter 4: The d- and f-Block Elements

31. Which of the following elements is NOT considered a transition metal?

Fe Cr Zn Cu

32. Highest oxidation state (+7) in the 3d transition series is shown by:

Mn Cr Fe V

33. Lanthanoid contraction is primarily responsible for the fact that:

Zr and Y have same radius Zr and Hf have same atomic radius Nb and Ta have different properties Mn and Re have same radius

34. Spin-only magnetic moment configuration formula μ is calculated by:

√(n(n+1)) √(2n+1)Class 12 Chemistry MCQ Quiz: Top 50 CBSE Board Exam Questions

WE hope you enjoyed these quizzes. If any improvement is required, then comment to us.

CBSE Syllabus latest pattern MCQs practice – Sone Publication

CBSE Class 12 Chemistry MCQ Quiz

Physics Mock — Thermodynamics

Leave a Comment / Quiz, Uncategorized / By Shiv