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Punjab (PTB) · 10th Class Chemistry paper scheme (Punjab boards) · Free

10th Class Chemistry Board Pattern Paper 2026

60 marks · About 2 hours (objective and subjective) · 39 questions. Covers: 13 chapters (CHAP 14: STATES OF MATTER AND PHASE CHANGES to CHAP 26: POLYMERS).

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10th Class Chemistry Board Pattern Paper 2026

10th Class · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 60Time: About 2 hours (objective and subjective)

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. What is the first step in identifying a limiting reactant?

    1. Balance the chemical equation

    2. Calculate the number of moles of the reactants

    3. Measure the room temperature

    4. Discard the excess reactant

  2. According to the solubility rules, which of these groups of salt are always soluble in water?

    1. All sodium, potassium, and ammonium salts

    2. Barium and lead sulfates

    3. Silver and lead chlorides

    4. All

  3. Gasoline has range of carbon atoms:

    1. 1–4

    2. 5–6

    3. 6–10

    4. 10–14

  4. Which catalyst is commonly used in the porous carbon electrodes of a fuel cell?

    1. Copper

    2. Zinc

    3. Platinum

    4. Iron

  5. Which two elements are specifically known to increase the risk of certain cancers?

    1. Lead and Mercury

    2. Arsenic and Cadmium

    3. Chromium and Copper

    4. Nitrogen and Phosphorus

  6. To obtain sulphuric acid of desired concentration, oleum is mixed with an appropriate amount of:

    1. Water

    2. Oxygen

    3. Hydrochloric acid

    4. Alcohol

  7. What happens to the movement of particles when a gas is cooled?

    1. They repel each other more

    2. They disappear

    3. They move faster

    4. Their kinetic energy decreases

  8. Which of the following is NOT one of the first four aliphatic alcohols used as fuel?

    1. Methanol

    2. Ethanol

    3. Propanol

    4. Pentanol

  9. Once bound with the reactant molecule, the particular chemical bonds in the reactant molecule are:

    1. Strengthened

    2. Broken completely into ions

    3. Sufficiently weakened

    4. Replaced by metallic bonds

  10. What serves as the basic building blocks for most lipids?

    1. Amino acids

    2. Glucose molecules

    3. Fatty acids

    4. Glycerol

  11. Hydrocarbons containing at least one double or triple bond are called:

    1. Saturated hydrocarbons

    2. Unsaturated hydrocarbons

    3. Alkanes

    4. Monosaccharides

  12. Which monomer is polymerized to produce polypropylene?

    1. Propylene

    2. Ethylene

    3. Styrene

    4. Vinyl Chloride

Q2. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. If 10 g of salt is dissolved in 0.5dm3 of water, what will be its concentration in g/dm3?

  2. How does the frequency of collisions change with an increase in reactant particles per unit volume?

  3. Why is fluorine always assigned a -1 oxidation number in binary compounds?

  4. What is the impact of heat on the internal energy of a system?

  5. Which reactants are used to prepare soluble potassium nitrate?

  6. Does the size of gas molecules affect the molar volume? Why or why not?

  7. Why does a test tube feel cold when ammonium chloride is dissolved in water?

  8. Define oxidation in terms of oxygen addition and give one example.

Q3. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. What information does the "Root" provide in IUPAC nomenclature? Give an example.

  2. Define the reactivity series of metals.

  3. How does potassium fertilizer make plants physically strong?

  4. Why is acetylene gas used for welding and cutting purposes?

  5. By what percentage can ethanol reduce greenhouse gas emissions compared to petrol?

  6. What is the difference between saturated and unsaturated hydrocarbons?

  7. How do group 1 metals (Na, K) react with cold water?

  8. Which minerals are typically found in tap water?

Q4. Short questions (Attempt any 5 of 8 · 5 × 2 = 10)

  1. What is HCG and when is it produced in the body?

  2. How can chemists change the specific properties of a polymer?

  3. How does acetic acid react with Mg and MgCO3?

  4. Which commercial products are obtained from oils and fats?

  5. What is the role of catalyst in addition polymerization?

  6. What is the chemical name and formula of the salt obtained by reacting ethanoic acid with marble chips?

  7. How do vitamins differ from carbohydrates, lipids, and proteins regarding energy provision?

  8. Distinguish between natural and man-made polymers.

Q5. Long questions (Attempt any 2 of 3 · 2 × 9 = 18)

  1. Differentiate between addition and condensation polymerizations.

  2. Describe which salts are soluble in water and which are insoluble.

  3. Write names, boiling range, composition and use of fractions of petroleum.