CBSE Class 12th Chemistry Top 50 MCQs with Answers

This is top 50 unofficial Chemistry MCQs with answer for CBSE Class 12 for your annual exam 2026.

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CBSE Class 12th Chemistry Exam Top 50 MCQs with Answers

Here are 50 important multiple-choice questions (MCQs) from all chapters in your 12th Chemistry syllabus along with their answers:

1. Which of the following is a colligative property?

a) Surface tension
b) Osmotic pressure
c) Viscosity
d) Density

Osmotic pressure.

2. What is the unit of molality?

a) mol/L
b) mol/kg
c) g/L
d) kg/mol

mol/kg.

3. Which law governs the solubility of gases in liquids?

a) Henry’s law
b) Raoult’s law
c) Dalton’s law
d) Boyle’s law

Henry’s law.

4. Which type of deviation is shown by ethanol and water mixture?

a) Positive
b) Negative
c) No deviation
d) None of these

Positive.

5. Van’t Hoff factor (i) for K₂SO₄ in water is:

a) 1
b) 2
c) 3
d) 4

6. Which of the following statements is true for a galvanic cell?

a) Oxidation occurs at the cathode
b) Reduction occurs at the anode
c) Electrons flow from the anode to the cathode
d) Anode is positive

Electrons flow from the anode to the cathode.

7. What is the standard electrode potential of the hydrogen electrode?

a) 0.00 V
b) 1.00 V
c) -0.76 V
d) 0.34 V

0.00 V.

8. Which electrolyte is used in a dry cell?

a) H₂SO₄
b) KOH
c) NH₄Cl
d) NaOH

NH₄Cl.

9. Which of the following is a primary cell?

a) Lead storage battery
b) Fuel cell
c) Dry cell
d) Nickel-cadmium cell

Dry cell.

10. Which law is used to determine the mass of a substance deposited during electrolysis?

a) Henry’s law
b) Faraday’s law
c) Raoult’s law
d) Nernst equation

Faraday’s law.

11. The rate of reaction is affected by:

a) Temperature
b) Concentration
c) Catalyst
d) All of these

All of these.

12. What is the unit of rate constant for a first-order reaction?

a) s^–1
b) mol L^–1 s^–1
c) L mol^–1 s^–1
d) L² mol^–2 s^–1

s^–1.

13. Half-life of a first-order reaction is:

a) Proportional to initial concentration
b) Independent of initial concentration
c) Inversely proportional to initial concentration
d) Depends on pressure

Independent of initial concentration.

14. The Arrhenius equation represents the effect of ______ on reaction rate.

a) Catalyst
b) Temperature
c) Pressure
d) Concentration

Temperature.

15. Activation energy is the:

a) Minimum energy required for a reaction to occur
b) Maximum energy required for a reaction
c) Energy of the reactants
d) Energy of the products

Minimum energy required for a reaction to occur.

16. Which element is not a transition metal?

a) Fe
b) Zn
c) Cr
d) Mn

Zn.

17. KMnO₄ is used as:

a) Reducing agent
b) Oxidizing agent
c) Both
d) None

Oxidizing agent.

18. Lanthanide contraction is due to:

a) Poor shielding by 4f electrons
b) High nuclear charge
c) Both (a) and (b)
d) None of these

Both (a) and (b).

19. Which of the following is a radioactive element?

a) Ce
b) U
c) La
d) Y

20. Which of the following is a transition element?

a) Ca
b) Sc
c) Na
d) K

Sc.

21. Which of the following is a chelating ligand?

a) CN^–
b) EDTA
c) NH₃
d) Cl^–

EDTA.

22. Which theory explains the colour and magnetic properties of coordination compounds?

a) VBT
b) Crystal field theory
c) Molecular orbital theory
d) Band Theory

Crystal field theory.

23. Oxidation state of Co in [Co(NH₃)₆]³⁺ is:

a) +1
b) +2
c) +3
d) 0

+3.

24. Which is a bidentate ligand?

a) NH₃
b) C₂O₄^2–
c) CN^–
d) Cl^–

C₂O₄^2–.

25. Which ligand causes the highest crystal field splitting?

a) CN^–
b) Cl^–
c) H₂O
d) OH^–

CN^–.

26. Which of the following will undergo SN₁ reaction most easily?

a) CH₃Cl
b) (CH₃)₃CBr
c) CH₃CH₂Br
d) CH₃CH₂Cl

(CH₃)₃CBr.

27. Which of the following is used as an anaesthetic?

a) CHCl₃
b) CCl₄
c) CH₂Cl₂
d) CF₂Cl₂

CHCl₃.

28. Which of the following undergoes nucleophilic substitution reaction most easily?

a) Benzyl chloride
b) Vinyl chloride
c) Chloroethane
d) Chlorobenzene

Benzyl chloride.

29. Freons are mainly used as:

a) Antiseptics
b) Refrigerants
c) Fertilizers
d) Medicines

Refrigerants.

30. DDT is a:

a) Polymer
b) Pesticide
c) Antibiotic
d) Fuel

Pesticide.

31. Phenol is more acidic than ethanol because:

a) Phenoxide ion is resonance stabilized
b) Ethoxide ion is resonance stabilized
c) Both are equally acidic
d) Phenol does not release H⁺ ions

Phenoxide ion is resonance stabilized.

32. Which reagent is used to distinguish between alcohols and phenols?

a) Fehling’s solution
b) Iodoform test
c) Neutral FeCl₃
d) Lucas reagent

Neutral FeCl₃.

33. Which compound is commonly known as wood spirit?

a) Ethanol
b) Methanol
c) Phenol
d) Glycerol

Methanol.

34. Ethers can be cleaved by:

a) Dilute H₂SO₄
b) Conc. HBr
c) NaOH
d) KMnO₄

Conc. HBr.

35. Which of the following is used as an antiseptic?

a) Benzene
b) Phenol
c) Ethanol
d) Ether

Phenol.

36. Which test is used to distinguish between aldehydes and ketones?

a) Lucas test
b) Tollens’ test
c) Fehling’s test
d) Both (b) and (c)

Both (b) and (c).

37. Which of the following undergoes the iodoform test?

a) Benzaldehyde
b) Acetone
c) Formaldehyde
d) Ethanol

Acetone.

38. Which of the following has the highest boiling point?

a) Alcohol
b) Aldehyde
c) Ketone
d) Ether

Alcohol.

39. What is the functional group of carboxylic acids?

a) –OH
b) –COOH
c) –CHO
d) –CO–

–COOH.

40. The reduction of aldehydes leads to the formation of:

a) Alcohols
b) Ketones
c) Carboxylic acids
d) Esters

Alcohols.

41. Which amine reacts with Hinsberg reagent to form a soluble product?

a) Primary amine
b) Secondary amine
c) Tertiary amine
d) Quaternary ammonium salt

Primary amine.

42. Which reagent is used to convert nitrobenzene into aniline?

a) LiAlH₄
b) Zn/HCl
c) K₂Cr₂O₇
d) NaOH

Zn/HCl.

43. Which of the following amines is most basic?

a) NH₃
b) CH₃NH₂
c) C₆H₅NH₂
d) (C₂H₅)₂NH

(C₂H₅)₂NH.

44. What is the product of the reaction between aniline and bromine water?

a) o-Bromoaniline
b) p-Bromoaniline
c) 2,4,6-Tribromoaniline
d) Aniline does not react with bromine water

2,4,6-Tribromoaniline.

45. Which of the following is a secondary amine?

a) NH₃
b) CH₃NH₂
c) (CH₃)₂NH
d) (CH₃)₃N

(CH₃)₂NH.

46. Glucose is an example of:

a) Disaccharide
b) Monosaccharide
c) Polysaccharide
d) Protein

Monosaccharide.

47. Which of the following is NOT a polysaccharide?

a) Starch
b) Glycogen
c) Cellulose
d) Sucrose

Sucrose.

48. The bond between two amino acids in a protein is called:

a) Glycosidic bond
b) Peptide bond
c) Phosphodiester bond
d) Hydrogen bond

Peptide bond.

49. Which of the following is an essential amino acid?

a) Glycine
b) Alanine
c) Lysine
d) Proline

Lysine.

50. Which nucleic acid is responsible for protein synthesis?

a) DNA
b) tRNA
c) rRNA
d) Both (b) and (c)