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Chemistry · Class 12 Science

Bihar Bseb Class 12 Chemistry — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2018–2026
Years of papers
8
Total Papers
8
Real Board Papers
0
Sample papers
682
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

96 Q2026complete
96 Q2025complete
96 Q2024complete
96 Q2023complete
96 Q2022complete
96 Q2021complete
—2020Not available
53 Q2019complete
53 Q2018complete

Bihar Board Intermediate 2026 · Set A

Real board examination

About this paper

The real Class-12 board examination held in 2026. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks
70
Questions
48
Duration
195 min
Sections
3

The marks / questions / duration above are the official exam pattern. We currently have 96 of this paper’s questions (200% of the full paper), with 96 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
Section A (Objective, Q1–70)Section Section A (Objective, Q1–70)Objective (MCQ) — answer any 35 of 70, on OMR35135
Section B — Short AnswerSection Section B — Short AnswerShort answer — answer any 10 of 2010220
Section B — Long AnswerSection Section B — Long AnswerLong answer (internal choice) — answer any 3 of 63515
Total4870

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Chemistry

Bihar Board Intermediate 2026 · Set A

Series/Set: ARoll No. ________
Time Allowed: 3 hr 15 minMaximum Marks: 70

General Instructions

  1. This question paper contains 48 questions divided into 3 sections — Section A (Objective, Q1–70), Section B — Short Answer, Section B — Long Answer.
  2. Section Section A (Objective, Q1–70) comprises 35 questions of 1 mark each (Objective (MCQ) — answer any 35 of 70, on OMR).
  3. Section Section B — Short Answer comprises 10 questions of 2 marks each (Short answer — answer any 10 of 20).
  4. Section Section B — Long Answer comprises 3 questions of 5 marks each (Long answer (internal choice) — answer any 3 of 6).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

Q1.
The number of atoms present in a face centred cubic unit cell is
  • (a) 2
  • (b) 3
  • (c) 4
  • (d) 12
[1]
Q2.
The packing fraction for body-centred cubic cell is
  • (a) 0.42
  • (b) 0.53
  • (c) 0.68
  • (d) 0.82
[1]
Q3.
Which of the following is ferromagnetic substance ?
  • (a) Fe
  • (b) Cu
  • (c) NaCl
  • (d) MnO
[1]
Q4.
Which of the following has Frenkel defect ?
  • (a) Sodium chloride
  • (b) Graphite
  • (c) Silver chloride
  • (d) Diamond
[1]
Q5.
An aqueous solution of which of the following compounds exhibits abnormal osmotic pressure ?
  • (a) Urea
  • (b) Common salt
  • (c) Glucose
  • (d) Sucrose
[1]
Q6.
The elevation in boiling point produced by one molal solution of a solute in a solvent is called
  • (a) Ebullioscopic constant
  • (b) Vapour pressure constant
  • (c) Cryoscopic constant
  • (d) None of these
[1]
Q7.
Aqueous solution of which of the following will have lowest vapour pressure ?
  • (a) 0.1 M BaCl2
  • (b) 0.1 M Urea
  • (c) 0.1 M Na2SO4
  • (d) 0.1 M Na3PO4
[1]
Page 1 of 11
Q8.
34.2 g of sugar is present in 234.2 g of its aqueous solution. Then its molal concentration is (a) 0.1 (b) 0.5 (c) 5.5 (d) 55.0
[1]
Q9.
Which of the following equations represents the Faraday's first law of electrolysis ? (a) mz = c.t (b) m = c.z.t (c) mc = z.t (d) c = m.z.t
[1]
Q10.
On increasing dilution, the specific conductance of an electrolyte (a) increases (b) decreases (c) remains constant (d) none of these
[1]
Q11.
The standard reduction potentials of metals A, B, C and D are -3.05, -1.66, -0.40 and +0.80 volt respectively. Which metal of the following would have the highest reducing power ? (a) A (b) B (c) C (d) D
[1]
Q12.
Which of the following is a secondary cell ? (a) Leclanche cell (b) Lead storage battery (c) Concentration cell (d) All of these
[1]
Q13.
Which of the following represents the effect of temperature on reaction rate ? (a) Nernst's equation (b) Gibbs-Helmholtz equation (c) Arrhenius equation (d) Van't Hoff equation
[1]
Q14.
Which of the following is not a first order reaction ? (a) CH3COOC2H5 + H2O --(H+)--> CH3COOH + C2H5OH (b) CH3COOC2H5 + NaOH --> CH3COONa + C2H5OH (c) 2H2O2 --> 2H2O + O2 (d) 2N2O5 --> 4NO2 + O2
[1]
Q15.
For a reaction, aA + bB -> products, -d[A]/dt is equal to (a) -d[B]/dt (b) (-b/d) d[B]/dt (c) (-a/b) d[B]/dt (d) (-b/a) d[B]/dt
[1]
Q16.
Radioactive decay is a (a) Zero order reaction (b) First order reaction (c) Second order reaction (d) Third order reaction
[1]
Q17.
The volumes of gases H2, CH4, CO2 and NH3 adsorbed by 1 g of charcoal at 288 K are in the order (a) H2 > CH4 > CO2 > NH3 (b) CH4 > CO2 > NH3 > H2 (c) CO2 > NH3 > H2 > CH4 (d) NH3 > CO2 > CH4 > H2
[1]
Page 2 of 11
Q18.
The correct expression for Langmuir's adsorption isotherm is (a) x/m = (1+aP)/b (b) x/m = aP/(1+bP) (c) x/m = (1+aP)/(1+bP) (d) x/m = 1/a + bP/a
[1]
Q19.
The size of colloidal particle is (a) 1 nm - 10 nm (b) 10 nm - 100 nm (c) 1 nm - 100 nm (d) 10 nm - 1000 nm
[1]
Q20.
Smoke is a colloidal state in which (a) a gas is dispersed in solid (b) a solid is dispersed in gas (c) a gas is dispersed in gas (d) a liquid is dispersed in gas
[1]
Q21.
Butter is an example of (a) Gel (b) Emulsion (c) Sol (d) Foam
[1]
Q22.
Which one of the following substances acts as an emulsifier ? (a) Common salt (b) Urea (c) Soap (d) Oil
[1]
Q23.
Which of the following is a biological catalyst ? (a) Carbohydrate (b) Enzyme (c) Amino acid (d) Nitrogenous base
[1]
Q24.
Which of the following is a shape selective catalyst ? (a) V2O5 (b) Cr2O3 (c) MnO2 (d) ZSM-5
[1]
Q25.
In thermite process, reducing agent is (a) C (b) Zn (c) Na (d) Al
[1]
Q26.
Which of the following metals is extracted by leaching the ore with dilute cyanide solution ? (a) Silver (b) Titanium (c) Vanadium (d) Zinc
[1]
Q27.
The main constituent of bones is (a) CaCO3 (b) Ca3(PO4)2 (c) CaSO4 (d) CaF2
[1]
Q28.
Which of the following metals is not extracted by the electrolysis of its ore ? (a) Na (b) Mg (c) Al (d) Fe
[1]
Page 3 of 11
Q29.
The extensive use of P4O10 is done as (a) Reducing agent (b) Preservative (c) Oxidising agent (d) Dehydrating agent
[1]
Q30.
Which of the following oxides is the most acidic ? (a) P2O5 (b) N2O5 (c) Sb2O5 (d) As2O5
[1]
Q31.
Which of the following has the highest bond energy ? (a) O - O (b) S - S (c) Se - Se (d) Te - Te
[1]
Q32.
Sulphur molecule is (a) Diatomic (b) Tetratomic (c) Triatomic (d) Octatomic
[1]
Q33.
Which of the following is the strongest base ? (a) ClO4^- (b) ClO3^- (c) ClO2^- (d) ClO^-
[1]
Q34.
Which of the following exhibits only one oxidation state other than zero ? (a) Cl2 (b) F2 (c) I2 (d) Br2
[1]
Q35.
Which of the following cannot act as a reducing agent ? (a) NO2 (b) SO2 (c) ClO2 (d) CO2
[1]
Q36.
Which of the following noble gases can most easily be liquefied ? (a) Ar (b) Ne (c) Xe (d) Kr
[1]
Q37.
The peroxy acid of sulphur is (a) H2S2O7 (b) H2S2O8 (c) H2SO4 (d) H2SO3
[1]
Q38.
In which of the following processes is nitric acid manufactured from ammonia ? (a) Ostwald process (b) Birkeland-Eyde process (c) Laboratory process (d) All of these
[1]
Q39.
Which of the following gases cannot be collected over water ? (a) H2 (b) O2 (c) CH4 (d) SO2
[1]
Page 4 of 11
Q40.
Which of the following is formed by the reaction of Hg with ozone ? (a) HgO (b) HgO2 (c) Hg2O (d) None of these
[1]
Q41.
The bleaching property of chlorine is due to (a) Acidic property (b) Oxidising property (c) Reducing property (d) Air polluting property
[1]
Q42.
The outermost electronic configuration of inert gases is (a) ns² np² (b) ns² np⁴ (c) ns² np⁵ (d) ns² np⁶
[1]
Q43.
If the electronic configuration of a transition element in its +3 oxidation state is [Ar]3d⁴, then its atomic number would be (a) 25 (b) 26 (c) 22 (d) 19
[1]
Q44.
The most common oxidation state of lanthanide elements is (a) +2 (b) +3 (c) +4 (d) 0
[1]
Q45.
The oxidation state of Ni in Ni(CO)4 is (a) +4 (b) +3 (c) +2 (d) 0
[1]
Q46.
The number of ions in aqueous solution of [Co(NH3)5Cl]Cl2 is (a) 3 (b) 4 (c) 2 (d) 6
[1]
Q47.
[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br are related to each other as (a) Ionisation isomers (b) Linkage isomers (c) Co-ordination isomers (d) Geometric isomers
[1]
Q48.
Vitamin B12 contains (a) Cobalt (b) Magnesium (c) Iron (d) Nickel
[1]
Q49.
When chloroform reacts with acetone then which of the following is formed ? (a) Ethylene dichloride (b) Mesitylene (c) Chloretone (d) Chloral
[1]
Q50.
In Wurtz reaction, the reduction of alkyl halide is carried with (a) Zn/HCl (b) HI (c) Zn/Cu couple (d) Na in presence of dry ether
[1]
Page 5 of 11
Q51.
Ethyl bromide on boiling with alcoholic caustic potash gives (a) Ethyl alcohol (b) Ethylene (c) Acetylene (d) Ethane
[1]
Q52.
The reaction, C6H5X + 2 Na + RX --(Dry ether)--> C6H5R + 2NaX is called (a) Wurtz reaction (b) Wurtz-Fittig reaction (c) Fittig reaction (d) Frankland reaction
[1]
Q53.
Which of the following reagents reacts with ethyl amine to give ethyl alcohol ? (a) Br2/KOH (b) Acidified KMnO4 (c) HNO3 (d) HNO2
[1]
Q54.
Which of the following is known as wood spirit ? (a) Methyl alcohol (b) Ethyl alcohol (c) Glycerol (d) Glycol
[1]
Q55.
When vapours of an alcohol are passed over hot reduced copper, it gives an alkene. The alcohol is (a) Primary (b) Secondary (c) Tertiary (d) None of these
[1]
Q56.
Phenol gives a compound of characteristic colouration with which among the following ? (a) Iodine solution (b) Bromine water (c) Aqueous FeCl3 solution (d) Ammonium hydroxide
[1]
Q57.
The general formula of ether is (a) CnH2nO (b) CnH2n+1O (c) CnH2n+2O (d) CnH2nO2
[1]
Q58.
Which of the following reagents reacts easily with both Acetaldehyde and Acetone ? (a) Fehling solution (b) Grignard reagent (c) Schiff's reagent (d) Tollen's reagent
[1]
Q59.
The IUPAC name of CH3CH2COCH2CH3 is (a) Diethyl ketone (b) 3-Pentanone (c) 2-Pentanone (d) Methyl propyl ketone
[1]
Q60.
With which of the following does Cannizzaro's reaction take place ? (a) CH3CHO (b) HCHO (c) HCOOH (d) CH3COCH3
[1]
Page 6 of 11
Q61.
Which of the following is tartaric acid ? (a) CH3-CH(OH)-COOH (b) HOOC-CH2-CH2-COOH (c) HOOC-CH(OH)-CH(OH)-COOH (d) HOOC-CH2-C(OH)(COOH)-CH2-COOH
[1]
Q62.
An organic compound on reaction with saturated solution of NaHCO3 gives effervescence. Then the compound is (a) Alkane (b) Alkene (c) Acetic acid (d) Ethyl alcohol
[1]
Q63.
Which of the following is Isopropyl amine ? (a) CH3-CH2-CH2-NH2 (b) CH3-NH-C2H5 (c) CH3-CH(NH2)-CH3 (d) CH3-CH(CH3)-CH2-NH2
[1]
Q64.
By which of the following processes, is methyl amine prepared ? (a) Wurtz reaction (b) Hoffmann Bromamide reaction (c) Friedel-Crafts reaction (d) Kolbe's reaction
[1]
Q65.
Maltose on hydrolysis gives (a) Glucose + Fructose (b) Galactose + Glucose + Fructose (c) Starch + Sucrose (d) Two molecules of Glucose
[1]
Q66.
Which of the following is not a macromolecule ? (a) DNA (b) Starch (c) Palmitate (d) Insulin
[1]
Q67.
Which of the following is capable of forming Zwitter ion ? (a) H2N-CH2COOH (b) CH3COOH (c) CH3CH2NH2 (d) CH3NO2
[1]
Q68.
Which of the following is used as antioxidant ? (a) Citric acid (b) EDTA (c) Sodium nitrite (d) Sodium gluconate
[1]
Q69.
Riboflavin is the chemical name of which of the following ? (a) Vitamin B1 (b) Vitamin B2 (c) Vitamin B6 (d) Vitamin B complex
[1]
Q70.
Which of the following is used as tranquilizer ? (a) Luminal (b) Tofranil (c) Mescaline (d) Sulphadiazine
[1]
Page 7 of 11
Section B

Q1.
What is called artificial sweetener ? Give an example.
[2]
Q2.
What is Buna-N-rubber ?
[2]
Q3.
Mention the utility of DNA fingerprinting.
[2]
Q4.
Write structural formulae of the following : (a) 2-Aminoethanol (b) N-Ethylethanamine
[2]
Q5.
Write IUPAC names of the following : (a) Lactic acid (b) Tartaric acid
[2]
Q6.
What is Fehling's solution ?
[2]
Q7.
What is metamerism ? Give example.
[2]
Q8.
What is called rectified spirit ?
[2]
Page 8 of 11
Q9.
How would you obtain the following compounds from ethyl bromide ? (a) Ethene (b) Diethyl ether
[2]
Q10.
Write IUPAC names of the following complex compounds : (a) [Co(NH3)5Cl]Cl2 (b) K3[Fe(C2O4)3]
[2]
Q11.
Why do transition elements form complex compounds ?
[2]
Q12.
What are called interhalogen compounds ? Give examples.
[2]
Q13.
"Dioxygen is a gas whereas sulphur is solid at room temperature." Give reason.
[2]
Q14.
Give the structure and basicity of orthophosphoric acid.
[2]
Q15.
Differentiate between Roasting and Calcination.
[2]
Q16.
Write a short note on Brownian movement.
[2]
Q17.
What is Pseudo first order reaction ? Give example.
[2]
Page 9 of 11
Q18.
What is the function of salt bridge in Electrochemical cell ?
[2]
Q19.
What are the differences between Ideal solution and Non-ideal solution ?
[2]
Q20.
How many tetrahedral and octahedral voids are there in a closed packing of N spheres ?
[2]
Section C

Q1.
How many types of crystals are there ? Explain them in brief.
[5]
Q2.
What do you understand by Primary and Secondary cells ? Mention giving one example of each.
[5]
Q3.
Explain extraction of copper from copper pyrite.
[5]
Page 10 of 11
Q4.
What are halogens ? Write their names and electronic configurations. Throw light on the tendency of halogen to form hydrides.
[5]
Q5.
What type of compound is an alcohol ? How is monohydric alcohol classified ?
[5]
Q6.
Write IUPAC names of the following structures : (a) CH3-CH(CH3)-CH2-CHO (b) CH3-CH(OH)-CH2-CHO (c) (CH3)3C-CO-CH3 (d) OHC-CHO (e) CCl3-CHO
[5]
Page 11 of 11