Chemistry Class 10 Guess Paper 2nd Annual / Supply Exams 2026 is prepared for students appearing in the Punjab Boards supplementary examinations. It covers important short questions, long questions, exercise questions, and Test Yourself questions from Chapters 9 to 16.

Students should prepare all the listed topics carefully, especially chemical equations, definitions, differences, examples, industrial processes, and environmental chemistry. This guess paper helps students prioritize their revision before the examination.

Chapter 9: Chemical Equilibrium

Important Topics

• Complete reaction with example.
• Chemical equilibrium.
• Static and dynamic equilibrium.
• Characteristics of forward and reverse reactions.
• Reactants and products.
• Large and small values of Kc.
• Reversible and irreversible reactions.
• Generalization about the direction of a chemical reaction.
• Equilibrium constant with an example.

Important Exercise Questions

Questions: 4, 5, 6, 7, 8, 9, 10, 11

Test Yourself:

• 9.2: Questions 1, 2, 3
• 9.3: Questions 1, 2, 3

Chapter 10: Acids, Bases and Salts

Important Topics

• Concepts of Humphry Davy and Lavoisier.
• Hyperacidity.
• Physical properties of acids and bases.
• Different concepts of acids and bases.
• Limitations of the Arrhenius concept.
• Conjugate acids and bases.
• Adduct with an example.
• Why is ammonia a Lewis base?
• Neutralization reaction.
• Two uses of nitric acid and acetic acid.
• Two uses of bases.
• pH, indicators, and universal indicators with examples.
• Salts and their characteristics.
• Types of salts: double, mixed, neutral, and complex salts.
• Two mineral acids.
• Why is water not a strong electrolyte?
• Uses of the following compounds:
  • Sodium carbonate (Na₂CO₃)
  • Washing soda (Na₂CO₃·10H₂O)
  • Calcium oxide (CaO)
  • Calcium chloride (CaCl₂)
  • Potassium nitrate (KNO₃)
• Exercise examples 10.2 and 10.4.

Important Exercise Questions

Questions: 5, 6, 7, 8, 13, 14, 16, 18, 20

Test Yourself:

• 10.1: Questions 3, 6, 7
• 10.2: Questions 2, 3, 6
• 10.4: Questions 1, 3

Chapter 11: Organic Chemistry

Important Topics

• Vital force theory.
• Four types of chemical formulae with examples.
• Aromatic compounds.
• Cyclic and acyclic compounds.
• Open-chain and closed-chain compounds.
• Homocyclic and heterocyclic compounds.
• Pitch.
• Isomerism and isomers of butane and pentane.
• Catenation with an example.
• Classification of coal.
• Sources and uses of organic compounds.
• Petroleum.
• Conditions necessary for catenation.
• Ester and carboxyl functional groups.
• Difference between aldehydes and ketones.
• Ammoniacal liquor.
• Coal tar.
• Important box on page 69.

Important Exercise Questions

Questions: 2, 3, 4, 6, 7, 8, 9, 12

Test Yourself:

• 11.1: Questions 1, 3, 4
• 11.2: Questions 3, 4, 5
• 11.3: Question 5
• 11.4: Question 4

Chapter 12: Hydrocarbons

Important Topics

• Physical properties and sources of alkanes and alkenes.
• Uses of methane and ethylene.
• Combustion under different conditions.
• Occurrence of alkenes.
• Difference between glycol and glyoxal.
• Uses of acetylene.
• Why are alkenes reactive?
• Why are bananas stored away from other fruits?
• Oxidation of alkynes with KMnO₄.
• Important box on page 87.

Important Exercise Questions

Questions: 1, 3, 4, 5, 6, 9, 10, 15

Chapter 13: Biochemistry

Important Topics

• Carbohydrates and their general formula.
• Definition of biochemistry.
• Monosaccharides and their properties.
• Oligosaccharides and their properties.
• Polysaccharides and their characteristics.
• Elements and sources of proteins.
• Essential and non-essential amino acids.
• Formulae of amino acids and triglycerides.
• How are amino acids the building blocks of proteins?
• Fatty acids with examples.
• Difference between oil and ghee.
• Why does rancid butter have a foul smell?
• Sources and uses of vitamins A and D.
• Hydrogenation.
• Significance of vitamins.
• Types of vitamins.

Important Exercise Questions

Questions: 1, 3, 6, 7, 11, 13, 14, 18, 20

Test Yourself:

• 13.4: Questions 2, 3, 6

Chapter 14: The Atmosphere

Important Topics

• Pollutants.
• Composition of dry air.
• Four natural systems.
• Layers of the atmosphere with their heights and temperatures.
• How does CO₂ contribute to the greenhouse effect?
• Greenhouse effect and global warming.
• Two effects of acid rain.
• Two effects of ozone depletion.
• Two effects of global warming and SO₂.
• Ozone and ozone hole.
• Incineration.
• Benefits of ozone.
• Difference between pollutants and contaminants.

Important Exercise Questions

Questions: 2, 3, 4, 5, 8, 10

Test Yourself:

• 14.1: Questions 2, 3, 4, 6
• 14.2: Questions 2, 4, 5
• 14.3: Questions 1, 2, 3, 4

Chapter 15: Water

Important Topics

• Occurrence of water.
• Properties of water.
• Why is water polar and a universal solvent?
• Soft and hard water.
• Clark’s method of water softening.
• Boiling method.
• Boiler scales and scum.
• Water pollution and the leaching process.
• Swimming pool chlorination.
• Why are fertilizers and pesticides used?
• Prevention of waterborne diseases.
• Important box on page 144.
• Disadvantages of hard water.
• Effects of water pollution.

Important Exercise Questions

Questions: 1, 3, 4, 7, 9, 10, 13

Test Yourself:

• 15.1: Questions 1, 2, 3
• 15.2: Questions 1, 5
• 15.3: Questions 1, 3
• 15.4: All questions

Chapter 16: Chemical Industries

Important Topics

• Minerals, ores, and their chemical formulae.
• Gangue.
• Metallurgy.
• Gravity separation and froth flotation.
• Smelting process.
• Electromagnetic separation.
• Raw materials and advantages of the Solvay process.
• Manufacturing of urea.
• Haber process.
• Importance of urea.
• Principle of fractional distillation.
• Name of a urea fertilizer manufacturing unit.

Important Exercise Questions

Questions: 3, 6, 8, 9, 11, 13, 14, 16

Test Yourself:

• 16.1: Questions 5, 7, 9
• 16.2: Questions 1, 3
• 16.3: Question 3
• 16.4: Questions 1, 2, 4

Most Important Long Questions for Class 10 Chemistry 2026

Prepare the following long questions thoroughly for the 2nd Annual / Supply Examinations.

Section 1: Acids, Bases, Salts and Organic Chemistry

1. Explain the Arrhenius, Brønsted–Lowry, and Lewis concepts of acids and bases.
2. Write the uses of acids and bases.
3. Explain the chemical properties of acids.
4. Describe the methods for preparing soluble and insoluble salts.
5. Write at least five uses of salts.
6. Explain the classification of organic compounds.
7. Describe any five characteristics of organic compounds.
8. Write a detailed note on catenation.
9. Explain the destructive distillation of coal.
10. Define a homologous series and describe its characteristics.

Section 2: Hydrocarbons and Biochemistry

1. Explain the halogenation of alkanes.
2. Describe the methods for preparing alkenes.
3. Write the uses of alkanes, alkenes, and alkynes.
4. Explain the physical properties of alkanes, alkenes, and alkynes.
5. Describe the sources of alkanes.
6. Explain the sources and uses of carbohydrates.
7. Describe the sources and uses of proteins.
8. Explain the sources and uses of lipids.
9. Describe the types of vitamins based on solubility and explain their significance.

Section 3: Environmental Chemistry and Chemical Industries

1. Explain the effects of acid rain.
2. Describe the effects of global warming.
3. Explain the effects of ozone depletion.
4. Describe the greenhouse effect.
5. Write detailed notes on the troposphere and stratosphere.
6. Explain the Solvay process.
7. Describe the manufacturing of urea.
8. Explain Bessemerization.
9. Describe the fractions of petroleum and their uses.
10. Explain the refining of metals.

Preparation Tips for Chemistry Supply Exams 2026

• Prepare all important long questions with headings, diagrams, and chemical equations where required.
• Memorize definitions, differences, examples, and uses of important compounds.
• Practice the listed exercise and Test Yourself questions from your prescribed textbook.
• Revise chemical formulae, reaction conditions, and industrial processes.
• Prepare the important textbook boxes mentioned on pages 69, 87, and 144.
• Do not skip any chapter, as this guess paper is a revision aid rather than a guarantee of examination questions.

Note: This Chemistry Class 10 Guess Paper 2026 is intended to help students prepare for the Punjab Boards 2nd Annual / Supply Examinations. Students should also review their complete syllabus and past papers.

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