The Bihar Board Class 12 Chemistry exam includes a large number of objective questions that help students score high marks quickly. To help you prepare effectively, we have created Bihar Board Class 12 Chemistry 75 Objective Questions with Options, fully based on the latest BSEB syllabus.
Yeh questions Pure Chemistry syllabus ke important chapters — Organic, Inorganic, Physical — sabhi topics ko cover karte hain.
Har question ke saath A, B, C, D options aur correct answer diya gaya hai.
Bihar Board Class 12 Chemistry 75 Objective Questions with Options | Latest BSEB MCQs 2025
75 Objective Questions (With A–D Options and Answers)
1. NaCl is an example of which type of solid?
A. Metallic solid
B. Ionic solid
C. Covalent solid
D. Molecular solid
Answer: B
2. Unit cell of NaCl is:
A. BCC
B. FCC
C. Simple cubic
D. Tetragonal
Answer: B
3. Formula of blue vitriol is:
A. CuSO₄·5H₂O
B. CuSO₄·7H₂O
C. CuSO₄·2H₂O
D. CuSO₄
Answer: A
4. Henry’s law is related to:
A. Vapor pressure
B. Solubility of gas
C. Osmosis
D. Surface tension
Answer: B
5. Molality is expressed in:
A. mol/L
B. mol/kg
C. g/L
D. mole fraction
Answer: B
6. Milk is an example of:
A. True solution
B. Suspension
C. Colloid
D. Super-saturated solution
Answer: C
7. Rusting of iron is:
A. Reduction
B. Neutralisation
C. Oxidation
D. Hydrolysis
Answer: C
8. SI unit of conductivity is:
A. ohm⁻¹ cm⁻¹
B. S/m
C. mho/cm
D. S/cm
Answer: B
9. In galvanic cell, the anode is:
A. Positive
B. Neutral
C. Negative
D. Both electrodes
Answer: C
10. Electrolysis of water produces:
A. CO₂
B. H₂ + O₂
C. H₂ only
D. O₂ only
Answer: B
11. Rate of reaction depends on:
A. Product concentration
B. Reactant concentration
C. Catalyst only
D. Pressure only
Answer: B
12. Half-life of zero-order reaction is:
A. Constant
B. Zero
C. Directly proportional to concentration
D. Inversely proportional
Answer: C
13. Strong electrolyte is:
A. Sugar
B. Urea
C. NaCl
D. Glucose
Answer: C
14. Lewis acid is:
A. NH₃
B. H₂O
C. BF₃
D. OH⁻
Answer: C
15. pH of neutral solution is:
A. 1
B. 14
C. 0
D. 7
Answer: D
16. Gas released in fermentation is:
A. Nitrogen
B. Oxygen
C. CO₂
D. Hydrogen
Answer: C
17. Chromatography is based on:
A. Filtration
B. Adsorption
C. Crystallisation
D. Evaporation
Answer: B
18. PVC is a:
A. Polymer
B. Metal
C. Alloy
D. Salt
Answer: A
19. Tetrahedral bond angle is:
A. 90°
B. 120°
C. 109.5°
D. 180°
Answer: C
20. Methane contains how many carbon atoms?
A. 4
B. 3
C. 2
D. 1
Answer: D
21. Aspirin is a:
A. Antibiotic
B. Analgesic
C. Antiseptic
D. Antacid
Answer: B
22. Bond in water molecule is:
A. Ionic
B. Metallic
C. Covalent
D. Coordinate
Answer: C
23. Major greenhouse gas is:
A. CO₂
B. N₂
C. O₂
D. NO
Answer: A
24. Example of carbohydrate is:
A. Glycine
B. Glucose
C. Methane
D. Urea
Answer: B
25. Reverse osmosis is used in:
A. Food processing
B. Fertilizer production
C. Water purification
D. Metal refining
Answer: C
26. Oxidation number of Cl in HClO₄:
A. +1
B. +3
C. +5
D. +7
Answer: D
27. Atomic number of Carbon is:
A. 6
B. 8
C. 10
D. 12
Answer: A
28. Highest ionisation energy element is:
A. Na
B. K
C. F
D. He
Answer: D
29. Hybridisation in CH₄ is:
A. sp
B. sp²
C. sp³
D. dsp³
Answer: C
30. Aromatic compound is:
A. Methane
B. Propane
C. Butane
D. Benzene
Answer: D
31. Bleaching powder formula is:
A. CaCO₃
B. CaCl₂
C. CaOCl₂
D. Ca(OH)₂
Answer: C
32. Which is a non-metal?
A. Sodium
B. Calcium
C. Sulphur
D. Potassium
Answer: C
33. Noble gas is:
A. CO₂
B. N₂
C. Ne
D. H₂
Answer: C
34. Acid solution pH is:
A. =7
B. >7
C. <7
D. 14
Answer: C
35. Valency of Nitrogen is:
A. 2
B. 3
C. 4
D. 6
Answer: B
36. Ore of aluminium is:
A. Bauxite
B. Galena
C. Haematite
D. Magnetite
Answer: A
37. Gas used in balloons is:
A. Nitrogen
B. Oxygen
C. Helium
D. Chlorine
Answer: C
38. Most electronegative element is:
A. Fluorine
B. Oxygen
C. Carbon
D. Nitrogen
Answer: A
39. Alcohol is:
A. Ethene
B. Ethyne
C. Ethanol
D. Methane
Answer: C
40. Bronze is alloy of:
A. Cu + Zn
B. Cu + Sn
C. Cu + Al
D. Cu + Fe
Answer: B
41. Biodegradable polymer is:
A. PVC
B. Nylon-6
C. PHBV
D. Polythene
Answer: C
42. Example of amino acid:
A. Glucose
B. Glycine
C. Starch
D. Cellulose
Answer: B
43. Vinegar contains:
A. Acetic acid
B. Citric acid
C. Lactic acid
D. Formic acid
Answer: A
44. Haber process produces:
A. HCl
B. Ammonia
C. H₂SO₄
D. Nitric acid
Answer: B
45. Catalyst in contact process is:
A. Fe
B. Pt
C. Ni
D. V₂O₅
Answer: D
46. Noble gas configuration ends at:
A. ns¹
B. ns²
C. ns²np⁴
D. ns²np⁶
Answer: D
47. Alkali metals belong to:
A. Group 1
B. Group 2
C. Group 17
D. Group 18
Answer: A
48. Formula of marble:
A. CaO
B. CaCO₃
C. CaSO₄
D. Ca(OH)₂
Answer: B
49. Table salt is:
A. NaNO₃
B. KCl
C. NaCl
D. Na₂CO₃
Answer: C
50. Molality depends on:
A. Volume of solution
B. Temperature
C. Pressure
D. Mass of solvent
Answer: D
51. Reducing sugar is:
A. Starch
B. Cellulose
C. Glucose
D. Glycogen
Answer: C
52. Elastomer is:
A. Nylon
B. Polyester
C. PVC
D. Rubber
Answer: D
53. Atomic radius increases due to:
A. Increase in valency
B. Increase in shells
C. Decrease in electrons
D. Increase in oxidation
Answer: B
54. Blood is:
A. True solution
B. Suspension
C. Colloid
D. None
Answer: C
55. Colligative property is:
A. Color
B. Density
C. Osmotic pressure
D. Viscosity
Answer: C
56. Complex salt example:
A. NaCl
B. MgO
C. [Cu(NH₃)₄]²⁺
D. KCl
Answer: C
57. Boiling point increases by:
A. Cooling
B. Solute addition
C. Removing heat
D. Compression
Answer: B
58. Green gas is:
A. Oxygen
B. Helium
C. Hydrogen
D. Chlorine
Answer: D
59. Example of ester:
A. Ethanol
B. Ethyl acetate
C. Benzene
D. Methane
Answer: B
60. General formula of alkene:
A. CₙH₂ₙ₊₂
B. CₙH₂ₙ
C. CₙH₂ₙ₋₂
D. CₙH₂ₙ₊₄
Answer: B
61. Functional group of alcohol:
A. –CHO
B. –OH
C. –COOH
D. –NH₂
Answer: B
62. Acid reacts with metal to form:
A. CO₂
B. H₂
C. N₂
D. O₂
Answer: B
63. Detergents are mainly:
A. NaCl
B. Sodium alkyl sulphate
C. H₂O
D. Na₂SO₄
Answer: B
64. Strong acid is:
A. H₂CO₃
B. CH₃COOH
C. HCl
D. H₂S
Answer: C
65. Not a greenhouse gas:
A. CO₂
B. CH₄
C. N₂
D. O₃
Answer: C
66. Fusion temperature of ice:
A. 0°C
B. 10°C
C. 100°C
D. –10°C
Answer: A
67. Water is polar due to:
A. Linear shape
B. Bent shape
C. Symmetry
D. No dipole
Answer: B
68. Natural source of vitamin C:
A. Rice
B. Milk
C. Wheat
D. Lemon
Answer: D
69. Anode in electrolytic cell is:
A. Negative
B. Neutral
C. Positive
D. None
Answer: C
70. Electrophile is:
A. OH⁻
B. H⁺
C. NH₃
D. CH₄
Answer: B
71. Sucrose is made of:
A. Glucose + Glucose
B. Glucose + Fructose
C. Fructose + Fructose
D. Lactose
Answer: B
72. Toluene is:
A. Ethyl benzene
B. Methyl benzene
C. Propyl benzene
D. None
Answer: B
73. Main ore of iron:
A. Galena
B. Bauxite
C. Haematite
D. Cryolite
Answer: C
74. Example of protein:
A. Glucose
B. Starch
C. Albumin
D. Cellulose
Answer: C
75. Gypsum formula:
A. CaCO₃
B. CaSO₄·2H₂O
C. CaO
D. Ca(OH)₂
Answer: B
FAQs — Bihar Board Class 12 Chemistry 75 Objective
1. How many MCQs are asked in the Bihar Board Class 12 Chemistry exam?
Around 35 objective questions are asked in the annual exam.
2. Are these 75 questions enough for revision?
Yes, these cover all important chapters of the syllabus.
3. Are these questions based on the latest BSEB syllabus?
Yes, they follow the new updated Bihar Board syllabus.
4. Do objective questions help in scoring high marks?
Yes, MCQs are scoring questions and help improve accuracy.
5. Can I download these in PDF?
Yes! Agar aap chaho toh main PDF file bhi create karke de sakta hoon.