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JKBOSE Class 12th Chemistry Guess Paper 2026: Most Important Questions

Comprehensive Exam Guide and High-Yield Questions for Session 2026

About JKBOSE Class 12th Chemistry Board Exam 2026

The Jammu and Kashmir State Board of School Education (JKBOSE) Class 12th Chemistry paper is designed to evaluate a student's conceptual clarity, analytical skills, and practical understanding of chemical principles. The syllabus is a balanced mix of Physical, Inorganic, and Organic Chemistry. To score a high percentage, students must be well-versed with numerical problems, chemical equations, mechanisms, and conceptual reasoning questions.

This curated Guess Paper for the 2026 Session contains 40 highly anticipated questions. These questions have been selected based on previous year trends, blueprint analysis, and weightage distribution. Practicing these topics will give students a strategic edge in their board exam preparation.

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Section A: Long Answer Type Questions (20 Questions)

[These questions carry maximum weightage. Focus on detailed explanations, derivations, and step-by-step chemical mechanisms.]

1. Define Raoult's law for a solution containing volatile liquids. Derive its mathematical expression and explain the reasons behind positive and negative deviations from ideal behavior.
2. What are colligative properties? Derive an expression to determine the molecular mass of a non-volatile solute using the elevation of boiling point method.
3. State and explain Kohlrausch's law of independent migration of ions. Discuss any two important applications of this law in detail.
4. Derive the integrated rate equation for a first-order chemical reaction. Show that the half-life period of a first-order reaction is independent of the initial concentration of reactants.
5. Explain the collision theory of chemical reaction rates. Discuss the significance of activation energy and the effect of temperature on the rate constant using the Arrhenius equation.
6. Discuss the principles and detailed step-by-step extraction of Extraction of Copper from copper pyrites, including the chemical reactions involved in the smelting and bessemerization processes.
7. Explain the manufacture of Ammonia by Haber's process. Discuss the optimum experimental conditions required to maximize the yield according to Le Chatelier's principle, along with a neat labeled diagram.
8. Describe the preparation, properties, and oxidizing behavior of Potassium Dichromate ($K_2Cr_2O_7$) or Potassium Permanganate ($KMnO_4$) with relevant ionic equations.
9. What is Lanthanoid Contraction? Discuss its causes and the significant consequences it has on the chemistry of post-lanthanoid elements.
10. On the basis of Crystal Field Theory (CFT), explain the splitting of d-orbitals in octahedral and tetrahedral coordination complexes. How does the value of $\Delta_o$ decide the spin state of a complex?
11. Explain $S_N1$ and $S_N2$ nucleophilic substitution reaction mechanisms in haloalkanes. Discuss the stereochemical aspects and factors affecting the reactivity of these mechanisms.
12. Describe the mechanism of acid-catalyzed dehydration of Ethanol to form Ethene. How can you distinguish between primary, secondary, and tertiary alcohols using the Lucas test?
13. Explain the mechanism of nucleophilic addition reaction in Aldehydes and Ketones. Why are aldehydes generally more reactive than ketones towards nucleophilic attack?
14. Describe the following named reactions with appropriate chemical equations: (a) Aldol Condensation, (b) Cannizzaro Reaction, (c) Clemmensen Reduction, and (d) Rosenmund Reduction.
15. Discuss the acidic nature of Carboxylic acids. Explain the mechanism of the Hoffmann Bromamide degradation reaction for the preparation of primary amines.
16. How are Primary, Secondary, and Tertiary Amines distinguished and separated using the Hinsberg reagent test? Write all relevant chemical equations.
17. What are Carbohydrates? How are they classified? Discuss the structure elucidation of Glucose, focusing on the chemical evidence that proves the presence of a straight chain and a carbonyl group.
18. Define Proteins. Discuss the primary, secondary, tertiary, and quaternary structures of proteins. What do you understand by the denaturation of proteins?
19. What is Nernst Equation? Derive the expression for the EMF of a standard electrochemical cell and explain how it can be used to calculate the equilibrium constant of a cell reaction.
20. Explain the following organic conversions with complete steps and conditions: (a) Benzene to Aniline, (b) Aniline to Phenol, (c) Acetone to Chloroform, and (d) Phenol to Salicylaldehyde.

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Section B: Short Answer Type Questions (10 Questions)

[These questions require precise concepts, structural formulas, or short reasoning explanations.]

21. State Henry's Law regarding the solubility of a gas in a liquid. Write its two important industrial or biological applications.
22. Define Fuel Cells. Briefly explain the working mechanism and advantages of the Hydrogen-Oxygen ($H_2-O_2$) fuel cell.
23. What is Pseudo-first-order reaction? Give one suitable chemical example to justify your answer.
24. Explain why Transition elements show variable oxidation states and have high tendencies to form interstitial compounds.
25. Define Ambidentate Ligands and Chelating Ligands. Give one example of each type along with their structures.
26. Explain Wurtz-Fittig reaction and Friedel-Crafts Alkylation of Chlorobenzene with chemical equations.
27. Why is Phenol more acidic than Ethanol? Explain the stability using the resonance structures of the phenoxide ion.
28. Explain the Kolbe's reaction and Reimer-Tiemann reaction with complete chemical equations.
29. What is Gabriel Phthalimide Synthesis? Why is this method preferred for the preparation of primary aliphatic amines but cannot be used for primary aromatic amines?
30. Distinguish between DNA and RNA based on their chemical composition, sugar components, and structural features.

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Section C: Very Short Answer Type Questions (10 Questions)

[Answer these questions in one or two sentences, focusing strictly on definitions, units, or direct core concepts.]

31. Define the term 'Van't Hoff factor' ($i$) and state its value for a solute that undergoes complete dimerization.
32. What is the effect of dilution on the specific conductivity and molar conductivity of a strong electrolyte?
33. Write the unit of the rate constant ($k$) for a zero-order and a second-order chemical reaction.
34. What is the role of Cryolite ($Na_3AlF_6$) in the electrometallurgy of Aluminum during the Hall-Heroult process?
35. Why are Fluorine molecules ($F_2$) stronger oxidizing agents than Chlorine ($Cl_2$), despite having lower electron gain enthalpy?
36. Write the IUPAC name and structure of the coordination complex: $[Co(NH_3)_5(CO_3)]Cl$.
37. Explain why Haloarenes are extremely less reactive towards nucleophilic substitution reactions compared to haloalkanes.
38. What is Zwitterion? Draw the zwitterionic structure of Glycine.
39. Identify the functional groups present in a Peptide Bond and write its general structural representation.
40. Name the deficiency disease caused by the lack of Vitamin C and Vitamin D in the human body.