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Class 10 Chemistry Chapter 14 Class Test 4 | Punjab Board 2027 Model Papers

Class 10 Chemistry Chapter 14 Topic 14.6 to 14.9 Model Papers

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Class 10 Chemistry Chapter 14 Class Test 4 – Punjab Board 2027

Chapter-Wise Chemistry Test | Topics 14.6 to 14.9 | 10th Class Model Papers

Prepare effectively for your upcoming Punjab Board Annual Examinations 2027 with Class 10 Chemistry Chapter 14 Class Test 4, available at 786Times.com. This chapter-wise Chemistry test is specially designed for 10th class students and covers important concepts from Chapter 14 – States of Matter and Phase Changes, including Topics 14.6 to 14.9. Students can use this Chemistry model paper to practise important MCQs, short questions and detailed questions according to their board examination preparation requirements.

📘 Class 10 Chemistry Chapter 14 – States of Matter and Phase Changes

Chapter 14 is an important part of the Class 10 Chemistry syllabus. This Class Test 4 focuses on selected topics from the chapter and provides students with an opportunity to strengthen their understanding of gas behaviour, kinetic molecular theory, diffusion and related chemical concepts.

📝 Topics Covered in Chemistry Class Test 4

  • Topic 14.6: Important concepts related to the chapter.
  • Topic 14.7: Gas behaviour and kinetic molecular theory.
  • Topic 14.8: Diffusion and its applications.
  • Topic 14.9: Important applications of diffusion in daily life and medicine.

🎯 MCQs, Short Questions and Long Questions

This Class 10 Chemistry Chapter 14 Test 4 includes multiple-choice questions (MCQs), short-answer questions and detailed questions. The objective section helps students check their conceptual knowledge, while the subjective section provides practice in writing clear and accurate Chemistry answers.

Important concepts include sublimation, Boyle’s Law, Avogadro’s Law, kinetic theory of gases, gas pressure, molecular collisions and the rate of diffusion. Students can also practise questions about the importance of medicine absorption and diffusion in the human body.

⭐ Why Should Students Attempt This Test?

  • Improve Chemistry subject knowledge.
  • Practise important board-style MCQs.
  • Prepare short and detailed questions.
  • Revise important concepts of Chapter 14.
  • Evaluate your examination preparation.
  • Improve time management and paper-attempting skills.

📚 Punjab Board Chemistry Model Papers 2027

If you are preparing for the 10th Class Chemistry Board Examination 2027, regular practice is essential. Attempt this chapter-wise test to identify your weak areas and improve your understanding of important Chemistry topics. These Punjab Board 2027 Model Papers are useful for students preparing for their Matric annual examinations.

📥 Access Class Test 4

Visit the following page to view and practise Class 10 Chemistry Chapter 14 Class Test 4.

📖 VIEW CHEMISTRY CLASS TEST 4

🌐 Visit 786Times.com for More Educational Updates

786Times.com provides educational resources for Pakistani students, including Class 9 and Class 10 model papers, chapter-wise test series, solved MCQs, important short questions, pairing schemes, smart syllabus updates and board examination preparation material. Stay connected with us for the latest Punjab Board educational updates and useful study resources for the 2027 annual examinations.

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Prepare for your exams with the Class 10 Chemistry Chapter 14 Class Test 4, covering States of Matter and Phase Changes, Topics 14.6 to 14.9. These Punjab Board 2027 Model Papers help students revise important chemistry concepts, practise chapter-wise test questions, and improve their exam preparation. Use this Class 10 Chemistry test for effective revision, self-assessment, and preparation for the Punjab Board Annual Examinations 2027.

Chapter Wise Class Test
T-4
Chapter-14
States of Matter and Phase Changes
1.1 Choose the correct Answer. (Time: 7 Minutes) (Total Marks: 8)
1. The scented substance in a solid air freshener changes directly into:
(a) liquid
(b) solid
(c) vapour
(d) ice
Answer: (c) vapour (sublimation)
2. During sublimation printing, the ink changes from:
(a) solid to liquid
(b) liquid to gas
(c) solid to vapour
(d) vapour to solid
Answer: (c) solid to vapour
3. Doubling the number of collisions of gas molecules with the container walls will result in:
(a) Decrease in pressure
(b) No change in pressure
(c) Doubling of pressure
(d) Complete loss of pressure
Answer: (c) Doubling of pressure
4. If the amount of gas in a container is increased while temperature remains constant, the pressure will:
(a) Decrease
(b) Remain constant
(c) Increase
(d) Become zero
Answer: (c) Increase
5. When the pressure on the trapped air was doubled, its volume became:
(a) Double the original volume
(b) One-fourth of the original volume
(c) Half of the original volume
(d) Unchanged
Answer: (c) Half of the original volume (P × V = constant)
6. According to kinetic theory, at constant temperature all gas molecules have the same:
(a) speed
(b) density
(c) average kinetic energy
(d) volume
Answer: (c) average kinetic energy
7. The diffusion of medicines between the stomach and intestine controls:
(a) drug elimination
(b) drug breakdown
(c) speed of absorption into blood
(d) storage of drugs
Answer: (c) speed of absorption into blood
8. Diffusion in drug delivery ensures that medicines:
(a) remain in the stomach
(b) reach target locations quickly
(c) are excreted immediately
(d) lose their effectiveness
Answer: (b) reach target locations quickly
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Chapter Wise Class Test
T-4
Chapter-14
States of Matter and Phase Changes
Total Marks: 17 (Subjective Type) Time: 33 Minutes
2. Write short answers to any six (6) questions. [6 × 2 = 12]
(i) What is sublimation printing?
Answer: Sublimation printing is a printing method in which solid dye or ink is heated so that it changes directly into vapour (without melting). The vapour enters the surface of the material (such as polyester fabric, mugs or tiles) and turns back into a solid, giving a printed design.
(ii) Why sublimation printing produces permanent designs.
Answer: In sublimation printing the ink turns into a gas and penetrates into the fibres or coating of the material, where it solidifies again. The dye becomes part of the material instead of lying on top of it, so the design does not peel, crack or fade easily on washing or rubbing.
(iii) Why the pressure of a gas increases when its volume is decreased at constant temperature?
Answer: When the volume decreases, the same number of gas particles move in a smaller space. They hit the container walls more often (more collisions per second), while their average kinetic energy stays the same because the temperature is constant. More frequent collisions per unit area mean greater pressure.
(iv) How does kinetic theory explain the upward movement of the piston when a gas is heated?
Answer: On heating, the gas particles gain kinetic energy and move faster. They collide with the piston and walls more often and with greater force, so the pressure inside increases. This pushes the piston upward until the pressure inside equals the external pressure, so the volume of the gas increases.
(v) How kinetic theory supports Avogadro’s law?
Answer: Avogadro’s law states that equal volumes of all gases at the same temperature and pressure contain the same number of particles. According to kinetic theory, at the same temperature all gas particles have the same average kinetic energy and they exert the same pressure through collisions. Hence the same pressure in the same volume needs the same number of particles, whatever the gas.
(vi) How does Boyle’s experiment verify Boyle’s law?
Answer: A fixed amount of air is trapped in a closed tube above mercury (or in a syringe) at constant temperature. When the pressure is increased in steps (for example doubled), the volume of the trapped air is measured each time. The volume is found to decrease in the same proportion (it becomes half when the pressure is doubled). The product P × V remains constant, which verifies Boyle’s law.
(vii) How does temperature affect the rate of diffusion of gases?
Answer: Raising the temperature increases the average kinetic energy of gas particles, so they move faster and spread out more quickly. Therefore the rate of diffusion increases with temperature, and it decreases when the temperature is lowered.
(viii) How does diffusion affect the absorption of orally taken medicines?
Answer: After a medicine is swallowed it dissolves in the stomach and intestine and moves by diffusion from the region of high concentration (the gut) across the intestinal wall into the blood. The faster the diffusion, the faster the medicine is absorbed and starts working; slower diffusion delays its effect.
(ix) According to kinetic theory of gases, why ammonia gas diffuse faster than hydrochloric acid?
Answer: At the same temperature, gas particles have the same average kinetic energy. Ammonia (NH₃, molar mass about 17) is lighter than hydrogen chloride (HCl, about 36.5), so its particles move with greater average speed. Therefore ammonia diffuses faster than hydrochloric acid (HCl) gas.
Note: Attempt any one question. [5 × 1 = 5]
3. Explain Boyle’s Law according to the kinetic particle theory. Write its mathematical equation.
Answer: Boyle’s law: At constant temperature, the volume of a fixed mass of a gas is inversely proportional to its pressure.
  • Gas pressure is caused by collisions of gas particles with the walls of the container.
  • At constant temperature the average kinetic energy and speed of the particles do not change.
  • If the pressure is increased, the volume decreases; the same particles are in a smaller space and hit the walls more frequently, so the pressure rises. If the volume is increased, the particles hit the walls less often and the pressure falls.
  • Doubling the pressure halves the volume, and halving the pressure doubles the volume.
Mathematical equation: V ∝ 1/P (at constant T and n), so P × V = constant, or P₁V₁ = P₂V₂.
4. What do you know about the importance of rate of diffusion of medicines in human body?
Answer: Diffusion is the spreading of particles from a region of higher concentration to a region of lower concentration. The rate at which a medicine diffuses decides how quickly it reaches its target, so it is very important in the human body:
  • Speed of absorption: a medicine moves by diffusion from the stomach and intestine into the blood. Faster diffusion means quicker absorption and quicker relief.
  • Reaching the target: diffusion carries the medicine from the blood to the tissues and organs where it is needed.
  • Correct dose and timing: doctors and pharmacists design tablets, syrups, injections and patches according to the rate of diffusion to control how fast or slowly the drug is released.
  • Effectiveness and safety: if diffusion is too slow the drug acts late or may not reach an effective level; if it is too fast, too much may enter the blood at once and cause side effects.
  • Affected by factors: temperature, concentration difference and the size of the drug molecules affect the rate.
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