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AIC SS1 Chemistry 3rd C.A 2nd Term
  • 1. The diagram above represents the arrangement of valence electrons in the molecule AB2. Which of the following pairs of electrons could be A and B respectively?
A) Sulphur and oxygen
B) Oxygen and hydrogen
C) Nitrogen and oxygen
D) Carbon and oxygen
  • 2. If an element X with atomic number 13 combines with an element Y whose atomic number is 8, the most likely formula of the compound formed between X and Y is .....
A) XY2
B) X2Y3
C) X3Y2
D) X2Y
  • 3. 13. In the equation above, the value p and x respectively are .......
A) 2 and 3
B) 8 and 2
C) 6 and 2
D) 1 and 3
  • 4. When a solid substance changes directly to a gas on heating without passing through the liquid state, the substance is said to have undergone:
A) Crystallisation
B) Melting
C) Evaporation
D) Sublimation
  • 5. Which of the following compounds exhibits coordinate bonding?
A) H2O
B) CO2
C) NH3
D) NaCl
  • 6. Which of the following is an example of a metallic compound?
A) Carbon dioxide
B) Iron
C) Sodium chloride
D) Water
  • 7. Which of the following compounds exhibits hydrogen bonding?
A) Ammonia (NH3)
B) Carbon dioxide (CO2)
C) Ethanol (C2H5OH)
D) Methane (CH4)
  • 8. According to the kinetic model of matter, particles in a gas:
A) Are closely packed together
B) Have fixed positions in a lattice structure
C) Have strong intermolecular forces of attraction
D) Have negligible volume compared to the space they occupy
  • 9. According to the kinetic model, solids:
A) Have particles that are highly compressed and far apart
B) Have particles that are highly compressed and free to move
C) Have particles that are closely packed together and vibrate in fixed positions
D) Have particles that are far apart and moving randomly
  • 10. Which of the following is an example of a physical change?
A) Melting of ice
B) Burning of wood
C) Digestion of food
D) Rusting of iron
  • 11. The general gas equation combines which of the following laws?
A) Charles's law and Avogadro's law
B) Boyle's law and Avogadro's law
C) Boyle's law, Charles's law, and Avogadro's law
D) Boyle's law and Charles's law
  • 12. The ideal gas equation is given by:
A) PV = RT
B) PV = nRT
C) P = V/nRT
D) PV = nT
  • 13. Gay-Lussac's law relates the pressure and temperature of a gas at constant:
A) Atomic mass
B) Number of moles
C) Density
D) Volume
  • 14. Which element is most likely to form a metallic bond?
A) Helium
B) Oxygen
C) Chlorine
D) Sodium
  • 15. According to the kinetic theory, which statement is true about gas particles?
A) They attract each other strongly
B) They are constantly in motion.
C) They have specific shapes.
D) They occupy a significant volume.
  • 16. When wood burns, it reacts with oxygen to form carbon dioxide and water vapor. According to the law of conservation of mass, the total mass of the:
A) wood and oxygen is less than the mass of the products.
B) wood and oxygen is equal to the mass of the carbon dioxide and water vapor.
C) wood and oxygen is greater than the mass of the products.
D) wood decreases, while the mass of the products remains constant.
  • 17. Which of the following statements does NOT support the law of definite proportions?
A) The color of a compound can vary depending on its source.
B) All samples of table salt (NaCl) have the same ratio of sodium to chlorine.
C) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass.
D) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin.
  • 18. If element X combines with element Y to form two different compounds, XY₂ and XY₃, the ratio of the masses of Y in these compounds will be:
A) 1:2
B) 2:3
C) 1:3/2
D) Cannot be determined without additional information.
  • 19. The equation 2H₂ + O₂ -> 2H₂O tells us that:
A) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water.
B) 2 grams of hydrogen react with 1 gram of oxygen to produce water.
C) Hydrogen and oxygen react explosively to form water.
D) Water can decompose into hydrogen and oxygen under specific conditions.
  • 20. If 5 moles of methane (CH₄) react completely, how many moles of carbon dioxide (CO₂) are produced according to the balanced equation: CH₄ + 2O₂ -> CO₂ + 2H₂O?
A) 5 moles
B) Cannot be determined without additional information.
C) 2.5 moles
D) 10 moles
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