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