Chemistry · Class 12 Science

Gujarat Gseb 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: 580
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

77 Q2026complete

77 Q2025complete

77 Q2024complete

—2023Paper not yet available

77 Q2022complete

—2021Exam cancelled (COVID-19)

68 Q2020complete

68 Q2019complete

—2018Paper not yet available

2023 — Paper not yet available: This year’s exam was held, but no verified question paper for this subject has been published by any source we check — the official GSEB archive and the public past-paper archives. We publish only a paper we can verify against a real printed original — this one will appear here once it is.

2021 — Exam cancelled (COVID-19): GSEB cancelled the Class-12 Higher Secondary Certificate (HSC) Examination in 2021 due to COVID-19; students were promoted via internal/alternative assessment. No exam was administered that year, so there is no genuine previous-year paper to publish.

2018 — Paper not yet available: This year’s exam was held, but no verified question paper for this subject has been published by any source we check — the official GSEB archive and the public past-paper archives. We publish only a paper we can verify against a real printed original — this one will appear here once it is.

GSEB Higher Secondary Certificate (HSC) Examination 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: 100
Questions: 68
Duration: 180 min
Sections: 4

The marks / questions / duration above are the official exam pattern. We currently have 77 of this paper’s questions (113% of the full paper), with 77 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
Part ASection Part A	mcq	50	1	50
Part B — Section ASection Part B — Section A	subjective	8	2	16
Part B — Section BSection Part B — Section B	subjective	6	3	18
Part B — Section CSection Part B — Section C	subjective	4	4	16
Total		68		100

The question paper

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

Board Examination

Chemistry

GSEB Higher Secondary Certificate (HSC) Examination 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 100

General Instructions

This question paper contains 68 questions divided into 4 sections — Part A, Part B — Section A, Part B — Section B, Part B — Section C.
Section Part A comprises 50 questions of 1 mark each (mcq).
Section Part B — Section A comprises 8 questions of 2 marks each (subjective).
Section Part B — Section B comprises 6 questions of 3 marks each (subjective).
Section Part B — Section C comprises 4 questions of 4 marks each (subjective).

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

Section A

Q1.

The system that forms maximum boiling azeotrope is

(a) acetone - chloroform
(b) ethanol - acetone
(c) n-hexane - n-heptane
(d) carbon disulphide - acetone

[1]

Q2.

3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?

(a) 80 torr
(b) 140 torr
(c) 72 torr
(d) 70 torr

[1]

Q3.

The elevation in boiling point of the solution prepared by dissolving 0.6 gram urea to 200 gram water is 0.50 C. What will be the molal elevation constant? (molecular weight of urea = 60 g/mol)

(a) 10 K kg mol
(b) 10 K kg mol^-1
(c) 1.0 K kg mol
(d) 100 K kg mol^-1

[1]

Q4.

What is the correct order of freezing points for the given solutions?

(i) 0.1 M CH3COOH(aq)
(ii) 0.1 M CH3COOH(C6H6)
(iii) 0.1 M CF3COOH(aq)
(iv) 0.1 M CH3COONa(aq)
(a)
(i) <
(iii) <
(iv) <
(ii)
(b)
(iv) >
(iii) >
(i) >
(ii)
(c)
(iii) <
(iv) <
(i) <
(ii)
(d)
(iv) <
(iii) <
(i) < (ii)

[1]

Q5.

The value of Henry's law constant for some gases at 293 K is given below. Arrange the gases in the increasing order of their solubility. (He: 144.97 kbar, H2: 69.16 kbar, N2: 76.48 kbar, O2: 34.86 kbar)

(a) He < N2 < H2 < O2
(b) O2 < H2 < N2 < He
(c) H2 < N2 < O2 < He
(d) He < O2 < N2 < H2

[1]

Q6.

Which of the following is an example of a solution where the solute and solvent both are solid?

(a) Copper dissolved in gold
(b) Amalgam of mercury with sodium
(c) Solution of hydrogen in palladium
(d) Camphor in nitrogen gas

[1]

Page 1 of 10

Q7.

If we use pentane as fuel in a fuel cell, what relationship will represent the change in Gibbs free energy? (E deg = 1.23 V) (a) delta G deg = -32F (1.23) (b) delta G deg = 8F/1.23 (c) delta G deg = -4F + 1.23 (d) delta G deg = -8F (1.23)

[1]

Q8.

When dilute H2SO4 is electrolyzed between platinum electrodes, what will be the ratio of moles of gaseous products obtained at the cathode and anode respectively? (a) 1 : 3 (b) 2 : 3 (c) 2 : 1 (d) 3 : 2

[1]

Q9.

Which of the following cells functions in basic medium? (i) Dry cell (ii) Mercury cell (iii) Lead storage cell (iv) Ni-Cd cell (a) (i), (ii), (iii) (b) (ii) (iv) (c) (i) (iii) (d) only (ii)

[1]

Q10.

An electrochemical cell can behave like an electrolytic cell when __. (a) E cell = 0 (b) E cell > E ext (c) E ext > E cell (d) E cell = E ext

[1]

Q11.

Which of the following reaction is true at 25 C for given cell? Cell: Pt | Br^-(aq) | Br2(l) || Cl^-(aq) | Cl2(g) | Pt (a) 2Br^-(aq) + Cl2(aq) -> 2Cl^-(aq) + Br2(l) (b) Br2(l) + 2Cl^-(aq) -> Cl2(g) + 2Br^-(aq) (c) Br2(l) + Cl2(g) -> 2Br^-(aq) + 2Cl^-(aq) (d) 2Br^-(aq) + 2Cl^-(aq) -> Br2(l) + Cl2(g)

[1]

Q12.

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be? (a) 0.118 V (b) 1.18 V (c) 0.059 V (d) 0.59 V

[1]

Q13.

For a given reaction: KClO3 + 6FeSO4 + 3H2SO4 -> KCl + 3Fe2(SO4)3 + 3H2O The order of reaction is __. (a) First (b) Second (c) Zero (d) Pseudo First Order Reaction

[1]

Q14.

Reaction 3ClO^- -> ClO3^- + 2Cl^- occurs in following two steps. (i) ClO^- + ClO^- --K1--> ClO2^- + Cl^- (Slow step) (ii) ClO2^- + ClO^- --K2--> ClO3^- + Cl^- (Fast step) then the rate of given reaction = __. (a) K1[ClO^-]² (b) K1[ClO^-] (c) K2[ClO2^-][ClO^-] (d) K2[ClO^-]³

[1]

Q15.

Which of the following graphs represents exothermic reaction? [Three energy-profile diagrams (i), (ii), (iii), each with a Reactants -> Activated complex -> Products hump, shown in the original paper] (a) (i) only (b) (ii) only (c) (iii) only (d) (i) and (ii)

[1]

Page 2 of 10

Q16.

In a reaction 2HI -> H2 + I2, the concentration of HI decreases from 0.5 mol L^-1 to 0.4 mol L^-1 in 10 minutes. What is the rate of reaction during this interval? (a) 5 x 10^-3 M min^-1 (b) 2.5 x 10^-3 M min^-1 (c) 5 x 10^-2 M min^-1 (d) 2.5 x 10^-2 M min^-1

[1]

Q17.

Which of the following statements is not correct for the catalyst? (a) It catalyses the forward and backward reaction to the same extent. (b) It alters delta G of the reaction. (c) It is a substance that does not change the equilibrium constant of a reaction. (d) It provides an alternate mechanism by reducing activation energy between reactants and products.

[1]

Q18.

Which of the following ion has the maximum theoretical magnetic moment? [Fe (Z=26), Cr (Z=24), Ti (Z=22), Co (Z=27)] (a) Fe3+ (b) Cr3+ (c) Ti3+ (d) Co3+

[1]

Q19.

The second and third row elements of transition metals resemble each other much more than they resemble the first row because of (a) lanthanoid contraction which results in almost same radii of second and third row metals (b) diagonal relationship between second and third row elements (c) similar ionisation enthalpy of second and third row elements (d) similar oxidation states of second and third row metals.

[1]

Q20.

Which compound is manufactured by using TiCl4 with Al(CH3)3 (a) Ethanol (b) Polyethylene (c) Ethanal (d) Hydrogenation of fat

[1]

Q21.

What products of Mn are obtained by heating KMnO4 at 513 K? (a) K2MnO4, Mn2O3 (b) K2MnO4, MnO2 (c) Mn2O3, MnO (d) Mn3O4, MnO2

[1]

Q22.

The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl is: (a) 7 (b) 8 (c) 9 (d) 6

[1]

Q23.

Which of the following pair is an example of linkage isomerism? (a) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2 . H2O (b) [Co(NH3)6]3+ [Cr(CN)6]3- and [Cr(NH3)6]3+ [Co(CN)6]3- (c) [Co(NH3)5(NO3)]Cl2 and [Co(NH3)5Cl](NO3)2 (d) [Co(NO2)(NH3)5]Cl2 and [Co(ONO)(NH3)5]Cl2

[1]

Q24.

The crystal field splitting energy for octahedral (delta o) and tetrahedral (delta t) complexes is related as (a) delta t = 1/2 delta o (b) delta t = 4/9 delta o (c) delta t = 3/9 delta o (d) delta t = 3/2 delta o

[1]

Q25.

What is the hybridisation involved in [Co(C2O4)3]³-? [Co (Z=27)] (a) sp3d2 (b) sp3d3 (c) dsp3 (d) d2sp3

[1]

Page 3 of 10

Q26.

Among the following select the most stable complex (a) [Fe(H2O)6]3+ (b) [Fe(C2O4)3]3- (c) [Fe(NH3)6]3+ (d) [FeCl6]3-

[1]

Q27.

Which of the following compounds, when released into the atmosphere, is responsible for depletion of the ozone layer? (a) CHCl3 (b) CH2Cl2 (c) CCl4 (d) CHI3

[1]

Q28.

For the following compounds, what is the correct increasing order of reactivity towards SN1 displacement? (I) 2-Bromo-2-methylbutane (II) 1-Bromopentane (III) 2-Bromopentane (a) I < III < II (b) II < III < I (c) III < II < I (d) I < II < III

[1]

Q29.

Which is the IUPAC name of final product of Kolbe's reaction? (a) 2-Hydroxybenzaldehyde (b) 2-Hydroxybenzoic acid (c) Aspirin (d) Salicylic acid

[1]

Q30.

Compound A, on reaction with CH3MgBr followed by hydrolysis, gives a secondary (2 deg) alcohol. Compound A is: (a) HCHO (b) CH3COCH3 (c) CH3COOH (d) CH3CHO

[1]

Q31.

Which of the following ethers can be prepared efficiently by Williamson ether synthesis? (a) tert-Butyl methyl ether using tert-butyl bromide (b) Di-tert-butyl ether using tert-butoxide and tert-Butyl bromide (c) Diphenyl ether using phenoxide and chlorobenzene (d) tert-Butyl ethyl ether using tert-butoxide and ethyl bromide

[1]

Q32.

Which is the major product Z in the following reaction? [benzene ring]-CH2-CH=CH2 + HBr --Peroxide--> Z (a) [benzene ring]-CH2-CH2-CH2-Br (b) benzene ring with -CH2-CH2-CH3 and ring -Br (ortho, as drawn) (c) [benzene ring]-CH2-CH(Br)-CH3 (d) benzene ring with -CH2-CH=CH2 and ring -Br (non-adjacent position, as drawn)

[1]

Q33.

Mark the correct order of decreasing acid strength of the following compounds. (a) Phenol (b) 4-Nitrophenol (NO2 para to OH) (c) 3-Methoxyphenol (OCH3 meta to OH) (d) 3-Nitrophenol (NO2 meta to OH) (e) 4-Methoxyphenol (OCH3 para to OH) (a) (e) > (d) > (b) > (a) > (c) (b) (b) > (d) > (a) > (c) > (e) (c) (d) > (e) > (c) > (b) > (a) (d) (e) > (d) > (c) > (b) > (a)

[1]

Q34.

In CH3-O-CH3, the bond angle in C-O-C and hybridization of carbon atom is __ and __ respectively. (a) 109 deg, sp2 (b) 111.7 deg, sp2 (c) 108.9 deg, sp3 (d) 111.7 deg, sp3

[1]

Q35.

Which compound is used in the manufacture of nylon-6,6? (a) Malonic acid (b) Succinic acid (c) Adipic acid (d) Glutaric acid

[1]

Page 4 of 10

Q36.

How many H and O atoms are present in vanillin respectively? (a) 8 and 4 (b) 9 and 3 (c) 9 and 4 (d) 8 and 3

[1]

Q37.

The major product formed when propanoic acid reacts with Red P + Br2 followed by hydrolysis is: (a) 3-Bromopropanoic acid (b) 2-Bromopropanoic acid (c) Bromobenzene (d) Propanal

[1]

Q38.

Which acid has lowest pKa? (a) C6H5COOH (b) HCOOH (c) C6H5CH2COOH (d) CH3CH2COOH

[1]

Q39.

Which is the major product X in the following reaction? H3C-C(=O)-CH2-CH2-CH(Cl)-CH3 --(i) NH2NH2 (ii) KOH/ethylene glycol, heat--> X (a) H3C-CH(OH)-CH2-CH2-CH(OH)-CH3 (b) H3C-CH2-CH2-CH2-CH(Cl)-CH3 (c) H3C-CH2-CH2-CH=CH-CH3 (d) H3C-CH2-CH2-CH2-CH(OH)-CH3

[1]

Q40.

The increasing order of reactivity towards nucleophilic addition is: (a) Acetophenone < Benzaldehyde < p-Tolualdehyde < p-Nitrobenzaldehyde (b) Benzaldehyde < Acetophenone < p-Nitrobenzaldehyde < p-Tolualdehyde (c) p-Tolualdehyde < Benzaldehyde < p-Nitrobenzaldehyde < Acetophenone (d) Acetophenone < p-Tolualdehyde < Benzaldehyde < p-Nitrobenzaldehyde

[1]

Q41.

Which of the following shows the correct increasing order of basic strength in aqueous solution? (a) NH3 < C2H5NH2 < (C2H5)2NH < (C2H5)3N < Aniline (b) Aniline < NH3 < (C2H5)3N < C2H5NH2 < (C2H5)2NH (c) Aniline < NH3 < C2H5NH2 < (C2H5)3N < (C2H5)2NH (d) NH3 < (C2H5)2NH < C2H5NH2 < (C2H5)3N < Aniline

[1]

Q42.

Benzene diazonium chloride is water __ and __ at room temperature. (a) Insoluble, Unstable (b) Soluble, Stable (c) Insoluble, Stable (d) Soluble, Unstable

[1]

Q43.

Which reagent can be used to distinguish between aniline and benzylamine? (a) CHCl3 / KOH (b) NaNO2 + HCl (c) C6H5SO2Cl (d) CH3COCl / Base

[1]

Q44.

Identify compounds A and B, and the reducing agent respectively used in the reaction. [benzene ring]-N2+ Cl- --CH3CH2OH--> A + B (a) A = C6H6, B = CH3COOH, CH3COOH (b) A = C6H6, B = CH3CHO, CH3CH2OH (c) A = C6H6, B = CH3CHO, C6H6 (d) A = C6H5OH, B = CH3, CHO, C6H5OH

[1]

Q45.

Which order of boiling points of the following compounds is correct? (a) (C2H5)2NH < (C2H5)3N < C2H5NH2 (b) C2H5NH2 < (C2H5)2NH < (C2H5)3N (c) (C2H5)3N < C2H5NH2 < (C2H5)2NH (d) (C2H5)3N < (C2H5)2NH < C2H5NH2

[1]

Page 5 of 10

Q46.

By which linkage are nucleotides joined together between 5' and 3' carbon atoms of pentose sugar? (a) Glycosidic (b) Polypeptide (c) Phosphodiester (d) Hydrogen bond

[1]

Q47.

[benzene ring]-NH2 --HNO3/H2SO4, 288K--> __ is a major product. (a) para-Nitroaniline (NH2, NO2 para) (b) ortho-Nitroaniline (NH2, NO2 ortho) (c) meta-Nitroaniline (NH2, NO2 meta) (d) 1,3-Dinitrobenzene (two NO2 groups meta, no NH2 shown)

[1]

Q48.

Insulin is a protein hormone consisting of: (a) 21 amino acids (b) 30 amino acids (c) 51 amino acids (d) 100 amino acids

[1]

Q49.

Which reagent does not react with glucose? (a) HCN (b) NaHSO3 (c) NH2OH (d) (CH3CO)2O

[1]

Q50.

Which of the following two hormones together regulate the glucose level in the blood? (a) Insulin, Androgen (b) Insulin, Glucagon (c) Glucagon, Androgen (d) Androgen, Estrogen

[1]

Section B

Q1.

Explain the nature of bonding in metal carbonyls.

[2]

Q2.

Give one example of each for Swarts reaction and Finkelstein reaction of alkyl halide.

[2]

Q3.

Write the mechanism of acid dehydration of ethanol to yield ethene.

[2]

Page 6 of 10

Q4.

A solution of Ni(NO3)2 is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode? (Atomic mass of Ni = 58.7u)

[2]

Q5.

What is meant by pseudo first order reaction? Explain giving example.

[2]

Q6.

What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

[2]

Q7.

Predict which of the following will be coloured in aqueous solution? Give reasons for each. Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and Co2+. [Ti (Z=22), V (Z=23), Cu (Z=29), Sc (Z=21), Mn (Z=25), Fe (Z=26), Co (Z=27)]

[2]

Q8.

Draw all the isomers (geometrical and optical) of [CoCl2(en)2]+

[2]

Q9.

Arrange each set of compounds in order of increasing boiling points. (i) Bromomethane, Bromoform, Chloromethane, Dibromomethane. (ii) 1-Chloropropane, Isopropyl chloride, 1-Chlorobutane.

[2]

Q10.

Predict the products formed when cyclohexanecarbaldehyde reacts with following reagents. (i) PhMgBr and then H3O+ (ii) Tollens' reagent

[2]

Q11.

The melting points and solubility in water of amino acids are generally higher than that of the corresponding halo acids. Explain.

[2]

Page 7 of 10

Q12.

How are vitamins classified? Name the vitamin responsible for the coagulation of blood.

[2]

Section C

Q1.

Write Van't Hoff law of osmotic pressure and explain its mathematical formation and also derive the formula to calculate osmotic pressure.

[3]

Q2.

Write the Nernst equation and calculate potential of the following cell at 298 K. Mg(s) | Mg2+ (0.001 M) || Cu2+ (0.0001 M) | Cu(s) [E deg Mg2+/Mg = -2.36 V and E deg Cu2+/Cu = +0.34 V]

[3]

Q3.

Derive the formula of first order reaction for, (i) Rate constant K, (ii) Half life period t(1/2) (graph is not required)

[3]

Q4.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

[3]

Q5.

How the following conversions can be carried out? (i) Isopropyl alcohol to Iodoform (ii) Benzyl alcohol to 2-phenylethanoic acid (iii) Chlorobenzene to p-nitrophenol

[3]

Page 8 of 10

Q6.

Write the major product of the following reactions: (a) CH3-CH=CH2 --H2O/H+--> (b) CH3-CH2-CH(CH3)-CHO --NaBH4--> (c) [benzene ring]-OC2H5 --Conc. H2SO4 / Conc. HNO3-->

[3]

Q7.

Write structural formulas and names of four possible aldol condensation products from propanal and butanal.

[3]

Q8.

How will you convert 4-nitrotoluene to 2-bromobenzoic acid?

[3]

Q9.

Write only chemical equations of the following reactions (i) Carbylamine reaction (ii) Hoffmann's bromamide reaction (iii) Coupling reaction

[3]

Section D

Q1.

0.6 mL of CH3COOH having density 1.06 g mL^-1 is dissolved in 1 litre of water. The depression in freezing point observed for this strength of acid was 0.0205 C. Calculate the Van't Hoff factor and the dissociation constant of acid. (Kf = 1.86 K kg mol^-1 and molecular mass of CH3COOH = 60 g mol^-1)

[4]

Q2.

Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

[4]

Page 9 of 10

Q3.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the value of A is 4 x 10¹0 s^-1, calculate the rate constant at 318 K and Ea, assuming Ea does not change with temperature.

[4]

Q4.

Answer the following questions for co-ordination complex K[Cr(H2O)2(C2O4)2] . 3H2O (i) Give IUPAC name of complex (ii) Give oxidation number coordination number of central metal ion (iii) Give d-orbital electronic configuration as per CFT (iv) Give the shape of complex and calculate its magnetic moment [Cr (Z=24)]

[4]

Q5.

Give equations of the following reactions: (i) Oxidation of propan-1-ol with alkaline KMnO4 solution. (ii) Bromine in CS2 with phenol. (iii) Dilute HNO3 with phenol. (iv) Treating phenol with chloroform in presence of aqueous NaOH.

[4]

Q6.

An organic compound with the molecular formula C6H10O forms 2,4-DNP derivative, reduces Tollens' reagent and undergoes Cannizzaro reaction. On vigorous oxidation it gives 1,2-benzenedicarboxylic acid. Identify the compound and write down its above chemical reactions. [the molecular-formula subscript was faint/blurred in the scan; transcribed as best-faith reading C6H10O, but the described chemistry (an aromatic aldehyde oxidising to 1,2-benzenedicarboxylic acid) suggests it may actually be C8H8O — see report]

[4]

Page 10 of 10