Preparing for the Bihar Board Class 12th Chemistry examination requires a strong grip on concepts along with regular practice of objective-type questions. The chemistry paper includes a significant number of multiple-choice questions (MCQs), which makes objective practice extremely important for scoring high marks.
In this blog post, we bring you Bihar Board Class 12th Chemistry 75 Objective Question with four options and correct answers. These questions are prepared strictly according to the latest Bihar Board syllabus and cover important chapters from Physical, Organic, and Inorganic Chemistry. Practicing these MCQs will help students improve speed, accuracy, and confidence before the final exam.
Bihar Board Class 12th Chemistry 75 Objective Question | MCQs with Answer
Q1. Which of the following is the SI unit of molarity?
A. mol kg⁻¹
B. mol L⁻¹
C. g L⁻¹
D. mol m⁻³
Answer: B
Q2. The pH value of pure water at 25°C is:
A. 5
B. 6
C. 7
D. 8
Answer: C
Q3. Which gas is evolved when zinc reacts with dilute hydrochloric acid?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Carbon dioxide
Answer: C
Q4. The atomic number of carbon is:
A. 4
B. 6
C. 8
D. 12
Answer: B
Q5. Which of the following is an example of an electrolyte?
A. Sugar solution
B. Alcohol
C. Sodium chloride solution
D. Distilled water
Answer: C
Q6. The hybridization of carbon in methane (CH₄) is:
A. sp
B. sp²
C. sp³
D. dsp²
Answer: C
Q7. Which metal is used as a catalyst in the Haber process?
A. Copper
B. Iron
C. Zinc
D. Aluminium
Answer: B
Q8. The molecular formula of benzene is:
A. C₆H₆
B. C₆H₁₂
C. C₆H₁₀
D. C₅H₆
Answer: A
Q9. Which acid is present in vinegar?
A. Formic acid
B. Acetic acid
C. Citric acid
D. Oxalic acid
Answer: B
Q10. The oxidation number of oxygen in H₂O₂ is:
A. –2
B. –1
C. 0
D. +1
Answer: B
Q11. Which element has the highest electronegativity?
A. Oxygen
B. Nitrogen
C. Fluorine
D. Chlorine
Answer: C
Q12. The boiling point of water increases due to:
A. Osmosis
B. Elevation
C. Depression
D. Diffusion
Answer: B
Q13. Which of the following is a strong acid?
A. CH₃COOH
B. H₂CO₃
C. HCl
D. H₃PO₄
Answer: C
Q14. The chemical formula of washing soda is:
A. Na₂CO₃
B. NaHCO₃
C. Na₂CO₃·10H₂O
D. NaOH
Answer: C
Q15. Which bond is present in NaCl?
A. Covalent
B. Metallic
C. Hydrogen
D. Ionic
Answer: D
Q16. Which gas is known as laughing gas?
A. NO
B. NO₂
C. N₂O
D. NH₃
Answer: C
Q17. The number of moles in 22.4 L of a gas at STP is:
A. 0.5
B. 1
C. 2
D. 4
Answer: B
Q18. Which compound shows hydrogen bonding?
A. HCl
B. NH₃
C. NaCl
D. CO₂
Answer: B
Q19. Which metal is liquid at room temperature?
A. Sodium
B. Mercury
C. Gallium
D. Cesium
Answer: B
Q20. The main ore of aluminium is:
A. Hematite
B. Bauxite
C. Magnetite
D. Zinc blende
Answer: B
Q21. Which reaction is endothermic?
A. Combustion
B. Neutralization
C. Photosynthesis
D. Respiration
Answer: C
Q22. The functional group of alcohol is:
A. –COOH
B. –CHO
C. –OH
D. –CO–
Answer: C
Q23. Which vitamin contains cobalt?
A. Vitamin A
B. Vitamin B₁₂
C. Vitamin C
D. Vitamin D
Answer: B
Q24. The pH of an acidic solution is:
A. Less than 7
B. Equal to 7
C. More than 7
D. Zero
Answer: A
Q25. Which gas is responsible for acid rain?
A. CO₂
B. SO₂
C. O₂
D. H₂
Answer: B
Q26. Which compound is used as an antiseptic?
A. Phenol
B. Methane
C. Ethanol
D. Acetone
Answer: A
Q27. The shape of ammonia molecule is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Pyramidal
Answer: D
Q28. Which metal is extracted by electrolytic reduction?
A. Iron
B. Copper
C. Aluminium
D. Zinc
Answer: C
Q29. Which gas is used in fire extinguishers?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Answer: C
Q30. The molar mass of water is:
A. 16 g/mol
B. 17 g/mol
C. 18 g/mol
D. 20 g/mol
Answer: C
Q31. Which element is a noble gas?
A. Oxygen
B. Nitrogen
C. Neon
D. Hydrogen
Answer: C
Q32. Which salt is used in photography?
A. NaCl
B. KBr
C. AgBr
D. CaCl₂
Answer: C
Q33. The oxidation state of sodium is always:
A. +1
B. +2
C. 0
D. –1
Answer: A
Q34. Which compound is known as dry ice?
A. Solid oxygen
B. Solid nitrogen
C. Solid CO₂
D. Solid hydrogen
Answer: C
Q35. The gas used in balloons is:
A. Oxygen
B. Hydrogen
C. Helium
D. Nitrogen
Answer: C
Q36. Which reaction involves loss of electrons?
A. Reduction
B. Oxidation
C. Neutralization
D. Hydrolysis
Answer: B
Q37. Which acid is present in lemon?
A. Acetic acid
B. Citric acid
C. Oxalic acid
D. Lactic acid
Answer: B
Q38. The common name of sodium bicarbonate is:
A. Washing soda
B. Baking soda
C. Bleaching powder
D. Caustic soda
Answer: B
Q39. Which gas causes greenhouse effect?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon
Answer: C
Q40. Which compound is used as a fertilizer?
A. Urea
B. Benzene
C. Methanol
D. Acetone
Answer: A
Q41. The valency of oxygen is:
A. 1
B. 2
C. 3
D. 4
Answer: B
Q42. Which metal is most reactive?
A. Iron
B. Copper
C. Sodium
D. Silver
Answer: C
Q43. The chemical formula of ammonia is:
A. NH₂
B. NH₃
C. NO₂
D. N₂H₄
Answer: B
Q44. Which compound is an alkane?
A. Ethene
B. Ethyne
C. Methane
D. Benzene
Answer: C
Q45. Which process is used to concentrate ore?
A. Distillation
B. Roasting
C. Froth flotation
D. Sublimation
Answer: C
Q46. Which indicator turns pink in base?
A. Methyl orange
B. Phenolphthalein
C. Litmus
D. Turmeric
Answer: B
Q47. The hardest substance is:
A. Iron
B. Graphite
C. Diamond
D. Quartz
Answer: C
Q48. Which compound is an aldehyde?
A. Ethanol
B. Ethanal
C. Ethanoic acid
D. Ether
Answer: B
Q49. The atomic mass unit is based on:
A. Hydrogen
B. Oxygen
C. Carbon-12
D. Nitrogen
Answer: C
Q50. Which gas is used in welding?
A. Oxygen
B. Acetylene
C. Nitrogen
D. Carbon dioxide
Answer: B
Q51. Which substance conducts electricity in molten state?
A. Sugar
B. Salt
C. Alcohol
D. Urea
Answer: B
Q52. Which element is used in making electric bulbs?
A. Copper
B. Aluminium
C. Tungsten
D. Iron
Answer: C
Q53. The chemical formula of bleaching powder is:
A. CaOCl₂
B. CaCl₂
C. CaCO₃
D. Ca(OH)₂
Answer: A
Q54. Which acid is present in ant sting?
A. Acetic acid
B. Formic acid
C. Lactic acid
D. Citric acid
Answer: B
Q55. Which compound is used as fuel?
A. Ethanol
B. Water
C. Sodium chloride
D. Carbon dioxide
Answer: A
Q56. The pH scale ranges from:
A. 0–7
B. 1–10
C. 0–14
D. 7–14
Answer: C
Q57. Which bond is strongest?
A. Ionic
B. Covalent
C. Hydrogen
D. Van der Waals
Answer: B
Q58. Which metal does not react with water?
A. Sodium
B. Potassium
C. Iron
D. Gold
Answer: D
Q59. The formula of common salt is:
A. Na₂CO₃
B. NaCl
C. NaOH
D. NaHCO₃
Answer: B
Q60. Which compound is basic in nature?
A. HCl
B. NaOH
C. H₂SO₄
D. HNO₃
Answer: B
Q61. Which element is used as a moderator in nuclear reactors?
A. Uranium
B. Graphite
C. Plutonium
D. Thorium
Answer: B
Q62. The chemical name of caustic soda is:
A. Sodium carbonate
B. Sodium bicarbonate
C. Sodium hydroxide
D. Sodium chloride
Answer: C
Q63. Which gas is essential for respiration?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Hydrogen
Answer: B
Q64. The main constituent of LPG is:
A. Methane
B. Ethane
C. Propane and Butane
D. Ethene
Answer: C
Q65. Which compound is used to preserve food?
A. Sodium benzoate
B. Sodium chloride
C. Potassium nitrate
D. Calcium carbonate
Answer: A
Q66. The shape of carbon dioxide molecule is:
A. Bent
B. Linear
C. Trigonal
D. Tetrahedral
Answer: B
Q67. Which metal is extracted from zinc blende?
A. Zinc
B. Copper
C. Lead
D. Silver
Answer: A
Q68. The functional group of carboxylic acid is:
A. –OH
B. –COOH
C. –CHO
D. –CO–
Answer: B
Q69. Which substance is used in thermometer?
A. Alcohol
B. Mercury
C. Water
D. Kerosene
Answer: B
Q70. Which gas is released during photosynthesis?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer: B
Q71. Which compound is an ester?
A. Ethanol
B. Ethanoic acid
C. Ethyl acetate
D. Methane
Answer: C
Q72. The main component of natural gas is:
A. Ethane
B. Propane
C. Methane
D. Butane
Answer: C
Q73. Which element is required for chlorophyll formation?
A. Iron
B. Magnesium
C. Zinc
D. Copper
Answer: B
Q74. Which gas is used for ripening fruits?
A. Methane
B. Ethylene
C. Oxygen
D. Nitrogen
Answer: B
Q75. The process of rusting is an example of:
A. Reduction
B. Neutralization
C. Oxidation
D. Displacement
Answer: C
Conclusion
These Bihar Board Class 12th Chemistry 75 Objective Question are extremely helpful for students preparing for board exams. Regular practice of such MCQs strengthens conceptual understanding and improves exam performance. Make sure to revise these questions multiple times and focus on weak areas to score excellent marks in Chemistry.
FAQs-Bihar Board Class 12th Chemistry 75 objective question
Q1. How many objective questions are asked in Bihar Board Class 12th Chemistry exam?
In the Bihar Board Class 12th Chemistry exam, around 70–75 objective questions (MCQs) are provided, out of which students need to attempt a fixed number as per the exam pattern. Practicing all 75 objective questions gives a strong advantage.
Q2. Are these Bihar Board Class 12th Chemistry objective questions based on the latest syllabus?
Yes, these Bihar Board Class 12th Chemistry 75 objective question are prepared strictly according to the latest BSEB syllabus and cover important topics from Physical, Organic, and Inorganic Chemistry.
Q3. Are MCQs enough to score good marks in Bihar Board Chemistry?
Objective questions play a very important role in scoring marks easily. However, students should also practice short and long answer questions along with MCQs for a high overall score.
Q4. From which chapters are these 75 Chemistry objective questions taken?
These questions are selected from major chapters like Electrochemistry, Solutions, Aldehydes and Ketones, Alcohols, Coordination Compounds, Chemical Kinetics, and Biomolecules, which are frequently asked in exams.
Q5. How should I practice Bihar Board Class 12th Chemistry objective questions?
Students should practice MCQs daily, revise incorrect answers, understand concepts behind each question, and attempt mock tests to improve speed and accuracy before the final exam.