Chemistry 9 Multiple Choice Questions

Multiple Choice Questions

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Chemistry 9 Multiple Choice Questions – Chapters 1 to 8

Chemistry is an essential subject that helps students understand matter’s composition, properties, and reactions. Multiple-choice questions (MCQs) are an effective way to test and reinforce key concepts in chemistry. Below are important MCQs from Chapters 1 to 8 of the 9th-grade chemistry curriculum.

Chapter 1: Nature of Science in Chemistry

Multiple Choice Questions (MCQs)

  1. Chemistry is the study of:
    a) Living organisms
    b) Matter and its changes ✅
    c) Planets and stars
    d) Computers

  2. The scientific method starts with:
    a) Experiment
    b) Observation ✅
    c) Hypothesis
    d) Theory

  3. Who is known as the father of modern chemistry?
    a) Dalton
    b) Lavoisier ✅
    c) Rutherford
    d) Einstein

  4. A hypothesis is:
    a) A proven fact
    b) A suggested explanation ✅
    c) A chemical reaction
    d) A measurement tool

  5. Which of the following is a qualitative observation?
    a) 5 grams of sugar
    b) 100°C boiling water
    c) Blue-colored solution ✅
    d) 10 ml of acid

Chapter 2: Matter

Multiple Choice Questions (MCQs)

  1. Matter is anything that:
    a) Has weight
    b) Occupies space
    c) Has mass and occupies space ✅
    d) Can be seen

  2. Which is a physical change?
    a) Rusting of iron
    b) Burning of wood
    c) Melting of ice ✅
    d) Cooking an egg

  3. An example of a homogeneous mixture is:
    a) Oil and water
    b) Sand and salt
    c) Sugar solution ✅
    d) Rice and beans

  4. Which state of matter has a definite shape and volume?
    a) Gas
    b) Liquid
    c) Plasma
    d) Solid ✅

  5. The smallest unit of an element is:
    a) Molecule
    b) Atom ✅
    c) Compound
    d) Proton

Chapter 3: Atomic Structure

Multiple Choice Questions (MCQs)

  1. The nucleus of an atom contains:
    a) Electrons only
    b) Protons and neutrons ✅
    c) Neutrons and electrons
    d) Protons and electrons

  2. The charge on an electron is:
    a) Positive
    b) Negative ✅
    c) Neutral
    d) Variable

  3. The atomic number of an element represents the number of:
    a) Neutrons
    b) Electrons
    c) Protons ✅
    d) Both protons and neutrons

  4. Who discovered the electron?
    a) Rutherford
    b) J.J. Thomson ✅
    c) Bohr
    d) Lavoisier

  5. Isotopes of an element differ in:
    a) Atomic number
    b) Number of protons
    c) Number of neutrons ✅
    d) Chemical properties

Chapter 4: Periodic Table and Periodicity of Properties

Multiple Choice Questions (MCQs)

  1. The modern periodic table is arranged based on:
    a) Atomic weight
    b) Atomic number ✅
    c) Density
    d) Mass number

  2. The elements in the same group have:
    a) The same atomic mass
    b) The same valence electrons ✅
    c) Different properties
    d) The same number of neutrons

  3. Which of the following is a noble gas?
    a) Oxygen
    b) Nitrogen
    c) Argon ✅
    d) Hydrogen

  4. Periods in the periodic table are:
    a) Vertical columns
    b) Horizontal rows ✅
    c) Groups of metals
    d) Groups of gases

  5. Alkali metals belong to:
    a) Group 1 ✅
    b) Group 2
    c) Group 7
    d) Group 18

Chapter 5: Chemical Bonding

Multiple Choice Questions (MCQs)

  1. An ionic bond is formed by:
    a) Sharing of electrons
    b) Transfer of electrons ✅
    c) Mixing of compounds
    d) Overlapping of orbitals

  2. Covalent bonds are formed between:
    a) Metal and non-metal
    b) Two metals
    c) Two non-metals ✅
    d) Metal and noble gas

  3. Which of the following bonds is the strongest?
    a) Covalent bond
    b) Hydrogen bond
    c) Ionic bond
    d) Metallic bond ✅

  4. In NaCl, sodium donates an electron to chlorine. This is an example of:
    a) Covalent bonding
    b) Ionic bonding ✅
    c) Metallic bonding
    d) Hydrogen bonding

  5. The bond in a water molecule (H₂O) is:
    a) Ionic
    b) Covalent ✅
    c) Metallic
    d) Polar ionic

Chapter 6: Stoichiometry

Multiple Choice Questions (MCQs)

  1. The mole represents:
    a) 6.022 × 10²³ particles ✅
    b) 3.14 × 10²⁰ particles
    c) The mass of a molecule
    d) 100 grams of a substance

  2. The law of conservation of mass states that:
    a) Mass is created
    b) Mass is destroyed
    c) Mass remains constant ✅
    d) Mass changes in a reaction

  3. The molecular weight of H₂O is:
    a) 10
    b) 18 ✅
    c) 16
    d) 14

Chapter 7: Electrochemistry

Multiple Choice Questions (MCQs)

  1. Electrochemistry is the study of:
    a) Heat and energy
    b) Chemical reactions involving electricity ✅
    c) Solid-state reactions
    d) Organic chemistry

  2. The substance that conducts electricity in solution is called:
    a) Metal
    b) Solvent
    c) Electrolyte ✅
    d) Non-metal

  3. The negative electrode in electrolysis is called:
    a) Anode
    b) Cathode ✅
    c) Neutral
    d) Positive terminal

Chapter 8: Energetics

Multiple Choice Questions (MCQs)

  1. An exothermic reaction:
    a) Absorbs heat
    b) Releases heat ✅
    c) Has no heat change
    d) Stores energy

  2. The energy required to start a chemical reaction is called:
    a) Activation energy ✅
    b) Kinetic energy
    c) Potential energy
    d) Thermal energy

  3. Which of the following is an example of an exothermic reaction?
    a) Melting ice
    b) Boiling water
    c) Burning fuel ✅
    d) Evaporating alcohol

These multiple-choice questions provide a quick way to review and test your understanding of chemistry concepts in 9th grade. By practicing these MCQs, students can strengthen their knowledge and prepare effectively for exams. 🚀 Happy learning!