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Class 9 Chemistry Chapter 1 States of Matter and Phase Changes: Important MCQs and Tips

States of Matter and Phase Changes is the first chapter of the new Class 9 Chemistry book. It introduces solids, liquids, gases and plasma, the particle model, the branches of chemistry, and the ideas of elements, compounds and mixtures. It is the foundation for everything that follows in Matric Chemistry, and because the concepts are simple, the board examiner can test them in many tricky ways.

In this post you will find the key topics to revise, quick exam tips, and eight practice MCQs taken from our 150-MCQ chapter test. Try them honestly before looking at the answers.

Key topics to revise

  • Branches of chemistry and what each studies.
  • States of matter: solid, liquid, gas and plasma, with everyday examples (such as plasma in neon signs).
  • Particle arrangement and motion in each state.
  • Elements, compounds and mixtures, and how they differ.
  • Homogeneous and heterogeneous mixtures, solutions, colloids and suspensions.
  • Allotropes and crystal forms of the same element.

Exam tips

  1. Link every property to particle spacing and energy; this one idea answers many questions.
  2. Make a three-column table of element, compound and mixture with two examples each.
  3. Learn the examples given in the textbook (plasma, noble gases, allotropes); MCQs are often built on them.
  4. Read all four options before choosing; two often look correct.

Practice MCQs

Q1. Matter is present in neon signs in the state of:

  • (a) Liquid crystal
  • (b) Gas
  • (c) Plasma
  • (d) Supercritical fluid

Q2. The crystals of which substance has rhombic shape?

  • (a) Graphite
  • (b) Bronze
  • (c) Brass
  • (d) Sulphur

Q3. When the tiny visible particles of a substance are dispersed through a medium, the mixture is named as:

  • (a) True solution
  • (b) Suspension
  • (c) Saturated solution
  • (d) Colloid

Q4. Understanding the causes, effects and solutions of different types of pollution is helped by:

  • (a) Polymer Chemistry
  • (b) Nuclear Chemistry
  • (c) Environmental Chemistry
  • (d) Astrochemistry

Q5. How many states of matter do we observe in everyday life according to the book?

  • (a) Two
  • (b) Three
  • (c) Six
  • (d) Four

Q6. Noble gases such as helium and argon exist as:

  • (a) Triatomic molecules
  • (b) Monoatomic molecules
  • (c) Diatomic molecules
  • (d) Network structures

Q7. An element cannot be broken down into simpler substances by:

  • (a) Weighing it
  • (b) Looking at it
  • (c) Measuring its volume
  • (d) Ordinary chemical reactions

Q8. The main branches of chemistry according to the key points are physical, inorganic and:

  • (a) Medicinal chemistry
  • (b) Geochemistry
  • (c) Organic chemistry
  • (d) Astrochemistry

Answers

  1. (c) Plasma
  2. (d) Sulphur
  3. (b) Suspension
  4. (c) Environmental Chemistry
  5. (d) Four
  6. (b) Monoatomic molecules
  7. (d) Ordinary chemical reactions
  8. (c) Organic chemistry

How to use these MCQs

Do not just read the answers. Cover them, attempt all eight questions within eight minutes, then check. For every wrong answer, open your textbook and read that paragraph again. Students who practise this way usually find that the same mistakes do not repeat in the board exam. Once you are comfortable with these, move on to a full timed test so that you can judge your preparation for the whole chapter of States of Matter and Phase Changes, not just a few questions.

Practise the full chapter

These questions are only a small part of our complete States of Matter and Phase Changes test. The full test has 150 MCQs, starting with all exercise MCQs from the textbook followed by carefully checked questions covering every topic of the chapter. You get an instant score, a full answer review, a printable result and up to three attempts in seven days.

Good luck with your preparation, from the Student Hub Pakistan team.