Class 9 Chemistry – Full Book MCQs Guess
Based on ALP 2025–26 (Punjab Boards)
Chapter 1: States of Matter and Phase Changes
1. Which branch of chemistry deals with the study of carbon compounds?
· a) Physical Chemistry
· b) Inorganic Chemistry
· c) Organic Chemistry ✓
· d) Biochemistry
2. A solution in which no more solute can be dissolved at a given temperature is called:
· a) Unsaturated solution
· b) Saturated solution ✓
· c) Supersaturated solution
· d) Colloidal solution
3. Which of the following is a homogeneous mixture?
· a) Salt solution ✓
· b) Chalk powder in water
· c) Muddy water
· d) Rock
4. The branch of chemistry that studies the chemical processes in living organisms is:
· a) Environmental Chemistry
· b) Biochemistry ✓
· c) Geochemistry
· d) Nuclear Chemistry
5. Which state of matter has the strongest intermolecular forces?
· a) Solid ✓
· b) Liquid
· c) Gas
· d) Plasma
Chapter 2: Atomic Structure
6. The number of electrons in the M shell of an atom can be at most:
· a) 8
· b) 18 ✓
· c) 32
· d) 2
7. Which particle was discovered by Goldstein in the discharge tube experiment?
· a) Electron
· b) Proton ✓
· c) Neutron
· d) Nucleus
8. Why is an atom electrically neutral?
· a) Number of protons = number of neutrons
· b) Number of protons = number of electrons ✓
· c) Number of electrons = number of neutrons
· d) All of these
9. The atomic number of an element is the number of:
· a) Protons in its nucleus ✓
· b) Neutrons in its nucleus
· c) Electrons in its outermost shell
· d) Protons and neutrons
10. Isotopes of an element have the same number of:
· a) Neutrons
· b) Protons ✓
· c) Nucleons
· d) All of these
11. The mass number of an atom is the sum of:
· a) Protons and electrons
· b) Protons and neutrons ✓
· c) Neutrons and electrons
· d) Only protons
Chapter 3: Chemical Bonding
12. Which of the following compounds contains both ionic and covalent bonds?
· a) NaCl
· b) MgCl₂
· c) NH₄Cl ✓
· d) CaO
13. Graphite is a good conductor of electricity because:
· a) It has strong covalent bonds
· b) It has layered structure
· c) It has free mobile electrons between layers ✓
· d) It is a metal
14. Which property of metals makes them malleable and ductile?
· a) Ionic bonding
· b) Metallic bonding ✓
· c) Covalent bonding
· d) Hydrogen bonding
15. A covalent bond is formed by:
· a) Transfer of electrons
· b) Sharing of electrons ✓
· c) Attraction between opposite charges
· d) Sea of electrons
16. Which of the following is an example of a polar covalent bond?
· a) H₂
· b) Cl₂
· c) HCl ✓
· d) N₂
Chapter 4: Stoichiometry
17. How many atoms are present in one mole of any substance?
· a) 6.022 * 10^{22}
· b) 6.022 *10^{23} ✓
· c) 6.022 *10^{24}
· d) 6.022 * 10^{21}
18. The empirical formula of benzene (C₆H₆) is:
· a) C₆H₆
· b) C₃H₃
· c) CH ✓
· d) C₂H₂
19. The molar mass of water (H₂O) is:
· a) 16 g/mol
· b) 17 g/mol
· c) 18 g/mol ✓
· d) 20 g/mol
20. How many moles are present in 36 g of water?
· a) 1 mole
· b) 2 moles ✓
· c) 3 moles
· d) 4 moles
21. The chemical formula of calcium phosphide is:
· a) CaP
· b) CaP₂
· c) Ca₂P₃
· d) Ca₃P₂ ✓
Chapter 5: Energetics
22. Breaking of a chemical bond is:
· a) Endothermic process ✓
· b) Exothermic process
· c) Both a and b
· d) Neither
23. The minimum energy required to start a chemical reaction is called:
· a) Enthalpy change
· b) Bond energy
· c) Activation energy ✓
· d) Heat of reaction
24. Which of the following is an example of an endothermic reaction?
· a) Burning of natural gas
· b) Respiration
· c) Photosynthesis ✓
· d) Neutralization
25. In an exothermic reaction, the energy of the products is:
· a) Greater than reactants
· b) Less than reactants ✓
· c) Equal to reactants
· d) Unrelated to reactants
26. The total heat content of a system at constant pressure is called:
· a) Enthalpy ✓
· b) Activation energy
· c) Internal energy
· d) Bond energy
Chapter 6: Equilibria
27. A reaction that can proceed in both forward and backward directions under the same conditions is called:
· a) Reversible reaction ✓
· b) Irreversible reaction
· c) Displacement reaction
· d) Double displacement reaction
28. The state in which the rate of forward reaction equals the rate of backward reaction is called:
· a) Static equilibrium
· b) Dynamic equilibrium ✓
· c) Chemical imbalance
· d) Completion
29. Which of the following is an example of a physical reversible change?
· a) Burning of wood
· b) Melting of ice ✓
· c) Rusting of iron
· d) Digestion of food
30. For a reversible reaction, equilibrium can only be attained in:
· a) An open container
· b) A closed container ✓
· c) Any container
· d) No container
31. The symbol \rightleftharpoons indicates:
· a) Irreversible reaction
· b) Reversible reaction ✓
· c) No reaction
· d) Endothermic reaction
Chapter 7: Acid Base Chemistry
32. According to Arrhenius concept, an acid is a substance that gives which ion in water?
· a) H⁺ ✓
· b) OH⁻
· c) Na⁺
· d) Cl⁻
33. Which of the following is a strong acid?
· a) Acetic acid
· b) Carbonic acid
· c) Hydrochloric acid ✓
· d) Citric acid
34. How many hydroxide ions (OH⁻) are released by Ca(OH)₂ in water?
· a) One
· b) Two ✓
· c) Three
· d) Zero
35. The reaction between an acid and a base to form salt and water is called:
· a) Combustion
· b) Oxidation
· c) Neutralization ✓
· d) Decomposition
36. Which gas is evolved when dilute HCl reacts with zinc granules?
· a) Oxygen
· b) Hydrogen ✓
· c) Carbon dioxide
· d) Chlorine
Chapter 8: Periodic Table and Periodicity
37. The modern periodic table arranges elements in increasing order of:
· a) Atomic mass
· b) Atomic number ✓
· c) Mass number
· d) Atomic volume
38. The vertical columns in the periodic table are called:
· a) Groups ✓
· b) Periods
· c) Blocks
· d) Series
39. Which element has the highest electronegativity?
· a) Chlorine
· b) Oxygen
· c) Fluorine ✓
· d) Nitrogen
40. As we move from left to right in a period, the atomic radius:
· a) Decreases ✓
· b) Increases
· c) Remains constant
· d) First increases then decreases
41. Ionization energy decreases down a group because:
· a) Nuclear charge increases
· b) Atomic size increases ✓
· c) Number of electrons decreases
· d) All of these
Chapter 9: Group Properties and Elements
42. Alkali metals are stored under oil because they are:
· a) Soft
· b) Highly reactive with air and water ✓
· c) Dense
· d) Good conductors
43. Which halogen is a liquid at room temperature?
· a) Fluorine
· b) Chlorine
· c) Bromine ✓
· d) Iodine
44. The reactivity of halogens down the group:
· a) Increases
· b) Decreases ✓
· c) Remains same
· d) First increases then decreases
45. Which of the following is a transition metal used as a catalyst in Haber's process?
· a) Copper
· b) Nickel
· c) Iron ✓
· d) Platinum
46. Noble gases are unreactive because they have:
· a) One valence electron
· b) Seven valence electrons
· c) Complete outermost shell (octet) ✓
· d) No electrons
Chapter 10: Environmental Chemistry
47. The percentage of nitrogen in clean dry air is approximately:
· a) 21%
· b) 78% ✓
· c) 0.04%
· d) 1%
48. Which gas is mainly responsible for acid rain?
· a) CO₂
· b) O₂
· c) SO₂ ✓
· d) N₂
49. Carbon monoxide (CO) is harmful because it:
· a) Causes acid rain
· b) Binds with hemoglobin and reduces oxygen supply ✓
· c) Destroys the ozone layer
· d) Causes global warming
50. The pH of acid rain is usually between:
· a) 5.6 – 6.5
· b) 4.2 – 4.4 ✓
· c) 7.0 – 8.0
· d) 8.5 – 9.5
51. Which of the following is a major source of sulfur dioxide (SO₂) in air?
· a) Complete combustion of methane
· b) Burning of coal containing sulfur ✓
· c) Respiration in animals
· d) Photosynthesis in plants
Chapter 11: Hydrocarbons
52. Hydrocarbons are compounds containing only:
· a) Carbon and oxygen
· b) Hydrogen and oxygen
· c) Carbon and hydrogen ✓
· d) Carbon, hydrogen and oxygen
53. The general formula of alkanes is:
· a) CₙH₂ₙ
· b) CₙH₂ₙ₊₂ ✓
· c) CₙH₂ₙ₋₂
· d) CₙHₙ
54. Which of the following is an unsaturated hydrocarbon?
· a) Methane
· b) Ethane
· c) Ethene ✓
· d) Propane
55. The simplest alkene is:
· a) Methane
· b) Ethene ✓
· c) Ethane
· d) Propyne
56. Which type of hydrocarbon contains at least one double bond?
· a) Alkane
· b) Alkene ✓
· c) Alkyne
· d) Cycloalkane
