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SS 1 AIC Chemistry Exam Questions - 3rd 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) Nitrogen and oxygen
B) Carbon and oxygen
C) Sulphur and oxygen
D) Oxygen and hydrogen
  • 2. A hydrocarbon containing 88.9% carbon has the empirical formula ..........[H=1, C=12]
A) CH
B) C2H3
C) C2H5
D) CH2
  • 3. 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) X3Y2
B) X2Y3
C) XY2
D) X2Y
  • 4. 13. In the equation above, the value p and x respectively are .......
A) 8 and 2
B) 6 and 2
C) 1 and 3
D) 2 and 3
  • 5. The IUPAC system uses -------- in naming compounds.
A) No of moles
B) Molar mass
C) Atomic mass
D) Oxidation numbers
  • 6. What is the oxidation number of manganese in KMNO4?
A) +7
B) -5
C) +8
D) -7
  • 7. 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) Evaporation
C) Sublimation
D) Melting
  • 8. A mixture of kerosene and water can be separated by:
A) Sublimation
B) Distillation
C) Separating funnel
D) Crystallisation
  • 9. What is the mass number of an element if its atom contains 10 protons, 10 electrons, and 12 neutrons?
A) 22
B) 20
C) 32
D) 10
  • 10. What is the percentage by mass of sodium in sodium hydroxide? (Na = 23, O = 16, H = 1)
A) 73.0%
B) 57.5%
C) 40.4%
D) 42.5%
  • 11. What is the percentage by mass of sulphur in aluminium tetraoxosulphate (VI), Al2(SO4)_3. ( Al = 27, S = 32, O = 16)
A) 42.66%
B) 28.07%
C) 14.71%
D) 21.33%
  • 12. Calculate the formula mass of tri lead tetraoxide Pb3O4 (Pb= 207, O = 16)
A) 685
B) 865
C) 586
D) 621
  • 13. What is the molecular mass of calcium trioxonitrate (V) 2Ca (NO3)_2 (Ca = 40, N = 14, O = 16)
A) 160
B) 346
C) 164
D) 328
  • 14. Hydrogen bonds are formed between hydrogen and:
A) Nitrogen
B) Helium
C) Oxygen
D) Carbon
  • 15. Which of the following compounds exhibits hydrogen bonding?
A) Ethanol (C2H5OH)
B) Ammonia (NH3)
C) Methane (CH4)
D) Carbon dioxide (CO2)
  • 16. Vander Waal's forces are:
A) Strong electrostatic attractions between ions
B) Weak intermolecular forces between molecules
C) Strong covalent bonds between atoms
D) Weak intramolecular forces within molecules
  • 17. Which of the following substances is primarily held together by Vander Waal's forces?
A) Ethanol (C2H5OH)
B) Methane (CH4)
C) Hydrogen peroxide (H2O2)
D) Sodium chloride (NaCl)
  • 18. The kinetic theory of gases explains the behavior of gases based on:
A) The chemical reactions occurring within a gas
B) The density of particles within a gas
C) The motion of particles within a gas
D) The arrangement of particles within a gas
  • 19. According to the kinetic model, solids:
A) Have particles that are far apart and moving randomly
B) Have particles that are closely packed together and vibrate in fixed positions
C) Have particles that are highly compressed and free to move
D) Have particles that are highly compressed and far apart
  • 20. Which of the following is an example of a physical change?
A) Melting of ice
B) Digestion of food
C) Burning of wood
D) Rusting of iron
  • 21. Charles's law describes the relationship between:
A) Pressure and volume of a gas
B) Volume and number of moles of a gas
C) Temperature and volume of a gas
D) Pressure and temperature of a gas
  • 22. The general gas equation combines which of the following laws?
A) Boyle's law and Avogadro's law
B) Boyle's law, Charles's law, and Avogadro's law
C) Boyle's law and Charles's law
D) Charles's law and Avogadro's law
  • 23. The ideal gas equation is given by:
A) P = V/nRT
B) PV = nRT
C) PV = nT
D) PV = RT
  • 24. Graham's law of diffusion states that the rate of diffusion of a gas is inversely proportional to its:
A) Square root of its molar mass
B) Pressure
C) Temperature
D) Volume
  • 25. Gay-Lussac's law relates the pressure and temperature of a gas at constant:
A) Number of moles
B) Volume
C) Atomic mass
D) Density
  • 26. The molar volume of a gas at standard temperature and pressure (STP) is approximately:
A) 0.224 L/mol
B) 2.24 L/mol
C) 224 L/mol
D) 22.4 L/mol
  • 27. The percentage composition of a compound is determined by:
A) Nuclear magnetic resonance
B) Infrared spectroscopy
C) Mass spectrometry
D) Analyzing the mass of each element in the compound
  • 28. In which zone of a Bunsen flame is incomplete combustion likely to occur?
A) Inner cone
B) Outer cone
C) Luminous zone
D) Non-luminous zone
  • 29. Concentrated acids have:
A) A pH less than 7
B) A pH greater than 7
C) A low concentration of solute in a given volume of solvent
D) A high concentration of solute in a given volume of solvent
  • 30. Which of the following is an example of a weak acid?
A) Acetic acid (CH3COOH)
B) Hydrochloric acid (HCl)
C) Sulfuric acid (H2SO4)
D) Nitric acid (HNO3)
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