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Chemistry · Class 12 Science

Jharkhand Jac 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
319
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

48 Q2026complete
48 Q2025complete
48 Q2024complete
54 Q2023complete
19 Q2022complete
—2021Not available
34 Q2020complete
34 Q2019complete
34 Q2018complete

JAC Intermediate Board 2026 · Set ANNUAL

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
—
Questions
—
Duration
—
Sections
—

The marks / questions / duration above are the official exam pattern. We currently have 48 of this paper’s questions, with 48 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

The question paper

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

Board Examination

Chemistry

JAC Intermediate Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: —Maximum Marks: —
Section A

Q1.
Which of the following aqueous solutions will have the maximum boiling point?
  • (a) 1% glucose
  • (b) 1% sucrose
  • (c) 1% NaCl
  • (d) 1% CaCl2
[1]
Q2.
What will be the molarity of 30 ml of 0.5 M H2SO4 solution diluted to 50 ml?
  • (a) 0.3 M
  • (b) 0.03 M
  • (c) 3 M
  • (d) 0.13 M
[1]
Q3.
A plant cell shrinks when it is kept in a
  • (a) Hypotonic solution
  • (b) Hypertonic solution
  • (c) Isotonic solution
  • (d) Pure water
[1]
Q4.
The amount of electricity required to obtain 1 mol of Cu from CuSO4 is
  • (a) 3 F
  • (b) 2 F
  • (c) 1 F
  • (d) 4 F
[1]
Q5.
The cell which is used in automobiles and inverters are
  • (a) Lead storage battery
  • (b) Nickel cadmium battery
  • (c) Dry cell
  • (d) Fuel cell
[1]
Q6.
Calculate the overall order of a reaction which has the rate expression: Rate = K[A]^1/2 [B]^3/2
  • (a) Second order
  • (b) First order
  • (c) Zero order
  • (d) Third order
[1]
Page 1 of 7
Q7.
Activation energy of a chemical reaction can be determined by (a) rate constant at standard temperature (b) rate constants at two different temperatures (c) orientation of reactant molecules during the collision (d) using catalyst
[1]
Q8.
For a first order reaction the correct graph is (a) concentration [R0] (y-axis) vs time (x-axis): a curve decreasing from a high value toward zero, labelled K = - slope (b) ln[R0] (y-axis) vs time (x-axis): a straight line with negative slope, labelled K = - slope (c) concentration log[R0] (y-axis) vs time (x-axis): a straight line with positive slope starting from origin, labelled K = slope (d) concentration [R0] (y-axis) vs time (x-axis): a flat horizontal line (constant concentration)
[1]
Q9.
A transition element X is placed in the first series of transition elements. It has the following characteristics: (i) It is a coinage metal. (ii) It has positive reduction potential. (iii) It does not react with HCl but reacts with nitric acid. The element 'X' is likely to be (a) Zn (b) Cu (c) Au (d) Ag
[1]
Q10.
Which of the following oxidation states is common for all lanthanoids? (a) +2 (b) +3 (c) +4 (d) +5
[1]
Q11.
Identify the homoleptic complex among the following compounds: (a) [Co(NH3)4Cl2]+ (b) [Ni(CN)4]2- (c) [Cr(NH3)2Cl2(en)]+ (d) Both (A) and (C)
[1]
Q12.
Which of the following is a bidentate ligand? (a) CN- (b) NH3 (c) C2O4²- (d) CO3²-
[1]
Q13.
SN1 reaction will be fastest in case of (a) Tertiary halide (b) Primary halide (c) Secondary halide (d) None of these
[1]
Q14.
The best method for the synthesis of alkyl fluoride is (a) Finkelstein reaction (b) Swarts reaction (c) Kolbe reaction (d) Wurtz reaction
[1]
Q15.
CH3CH=CH2 --H+/H2O--> A. Major product is (a) CH3-CH-CH2 with an O bridging the CH and CH2 (a three-membered cyclic ether / epoxide, i.e. 2-methyloxirane) (b) CH3-CH(OH)-CH3 (propan-2-ol) (c) CH3CH2CH2OH (propan-1-ol) (d) CH3-CH(OH)-CH2-OH (propane-1,2-diol)
[1]
Q16.
IUPAC name of [a benzene ring with an -OC2H5 (ethoxy) group attached] is (a) Benzyl ethoxide (b) Benzene ethoxide (c) Ethoxybenzene (d) Ethoxybenzoyl
[1]
Page 2 of 7
Q17.
CH3CH2O(-) Na(+) + CH3Cl --> P. Product 'P' is (a) CH3CH2CH3 (b) CH3CH2OCH3 (c) CH3CH=CH2 (d) CH3CH2OH
[1]
Q18.
Tollen's reagent is used to distinguish between (a) Alcohol and ether (b) Aldehydes and ketones (c) Carboxylic acid and esters (d) 1 degree, 2 degree and 3 degree amines
[1]
Q19.
In Clemmensen reduction, carbonyl compound is reduced in the presence of (a) Zn-Hg + HCl (b) Na + C2H5OH (c) Zn-Hg + HNO3 (d) Na + dry ether
[1]
Q20.
Identify the Hinsberg reagent: (a) benzene ring - CONH2 (benzamide) (b) benzene ring - O - COCl (phenyl chloroformate) (c) benzene ring - SO2Cl (benzenesulfonyl chloride) (d) CH3 - benzene ring - COCl (4-methylbenzoyl chloride)
[1]
Q21.
Which one of the following reactions will not form primary amine? (a) CH3CONH2 --KOH, Br2--> (b) CH3CN --LiAlH4--> (c) CH3NC --LiAlH4--> (d) CH3CH2CONH2 --LiAlH4-->
[1]
Q22.
Which of the following is an Aldohexose? (a) Cellulose (b) Sucrose (c) Raffinose (d) Glucose
[1]
Q23.
An example of fibrous protein is (a) Keratin (b) Myosin (c) Both (A) and (B) (d) None of these
[1]
Q24.
alpha-helix structure is found in (a) DNA (b) RNA (c) Lipid (d) Protein
[1]
Q25.
Vitamin C is (a) Water soluble (b) Fat soluble (c) Soluble in both (d) None of these
[1]
Page 3 of 7
Section B

Q1.
Define mole fraction.
[1]
Q2.
Calculate the half-life period of a first order reaction whose rate constant is 200 s^-1.
[1]
Q3.
Why is Zn not considered as transition element? (Z = 30)
[1]
Q4.
Draw the structure of geometrical isomers of [Co(NH3)4Cl2].
[1]
Q5.
Identify X and Y in the following reaction: cyclohexyl bromide + Mg --(dry ether)--> X --(H2O)--> Y + Mg(OH)Br
[1]
Q6.
Alcohols are more soluble in water than hydrocarbons of comparable molecular masses. Why?
[1]
Q7.
Write the IUPAC name of (CH3)2CHNH2.
[1]
Q8.
Name the reaction in which aldehydes with no alpha-hydrogen atom undergo self-oxidation and reduction reaction in presence of conc. alkali.
[1]
Q9.
Write the name of any one source of vitamin A.
[1]
Page 4 of 7
Q10.
State Kohlrausch's law. Calculate lambda-degreem for Cl- ion from the data given below: lambda-degreem MgCl2 = 258.6 S cm² mol^-1; lambda-degreem Mg²+ = 106.0 S cm² mol^-1.
[3]
Q11.
Calculate the magnetic moment of the following ions: a) Ti²+ (Z = 22) b) Zn²+ (Z = 30) c) Cr²+ (Z = 24)
[3]
Q12.
Write the steps for the preparation of potassium dichromate (K2Cr2O7) from chromite ore.
[3]
Q13.
Write the formulae of the following coordination compounds: a) Tetraammineaquachloridocobalt(III) chloride b) Potassium trioxalatoaluminate(III) c) Tetrahydroxozincate(II)
[3]
Q14.
Predict the product: a) [benzene ring with -OH substituent (phenol)] --Zn dust / heat--> b) [benzene ring with -OCH3 substituent (anisole)] + conc. HNO3 --conc. H2SO4--> c) CH3COOH --(i) red P / Cl2 (ii) H2O-->
[3]
Q15.
How will you bring about the following conversions? a) Butan-2-ol to Butan-2-one b) Chloromethane to ethane c) Benzoyl chloride to benzaldehyde
[3]
Q16.
Write the hydrolysis products of the following: a) lactose b) sucrose c) maltose
[3]
Page 5 of 7
Q17.
Write the IUPAC names of the following: a) Ph-CH=CH-CHO b) CH3-C(CH3)2-CH2Br c) [a benzene ring bearing a -COCH3 group and, on the adjacent (ortho) carbon, an -OH group]
[3]
Q18.
Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.540 g ml^-1?
[5]
Q19.
Define electromotive force (EMF). Calculate the emf of the following cell: Zn(s) | Zn²+(0.1 M) || Ag+(0.01 M) | Ag(s). Given: E-degree Zn2+/Zn = -0.76 V, E-degree Ag+/Ag = +0.80 V.
[5]
Q20.
a) Differentiate between order and molecularity. b) Mention the factors that affect the rate of the chemical reactions.
[5]
Q21.
[Fe(H2O)6]³+ is strongly paramagnetic whereas [Fe(CN)6]³- is weakly paramagnetic. Explain.
[5]
Page 6 of 7
Q22.
Draw the structures of the following compounds: a) 3-bromo-2-methyl propene b) m-nitrobenzoic acid c) 4-bromoanisole d) 3-chloro-4-phenyl pentanoic acid e) Picric acid
[5]
Q23.
Write short notes on the following: a) Sandmeyer's reaction b) Reimer-Tiemann reaction c) Finkelstein reaction.
[5]
Page 7 of 7