10 minutes maximum

An IB Periodic Table is required.

1. Which two species are the Brønsted-Lowry bases in the ionization of methylamine in water, as shown below?

CH3NH2 + H2O ⇌ CH3NH3+ + OH-

  • A.   CH3NH2 and OH-
  • B.   CH3NH3+ and OH-
  • C.   CH3NH2 and H2O
  • D.   H2O and CH3NH3+
2. What is the conjugate base of HCO3- ?
  • A.   CO2
  • B.   CO3-
  • C.   CO32-
  • D.   H2CO3
3. Consider the following reaction in a phosphate buffer:

H2PO4- + H2O ⇌ HPO42- + H3O+

Which of the following statements is correct?

  • A.   H2PO4- is a conjugate acid of HPO42- .
  • B.   H3O+ is a conjugate base of H2O.
  • C.   H2PO4- and H2O are a conjugate acid-base pair.
  • D.   Water acts as a Brønsted-Lowry acid in the forward reaction.
4. Which two species in the following equation act as Brønsted-Lowry acids?

H2SO4 + HNO3 ⇌ HSO4- + H2NO3+

  • A.   H2SO4 and HNO3
  • B.   HNO3 and H2NO3+
  • C.   H2SO4 and HSO4-
  • D.   H2SO4 and H2NO3+
5. Which of the following word equations are correct for forming potassium chloride salt?

I. potassium + hydrochloric acid  potassium chloride + oxygen
II. potassium hydroxide + hydrochloric acid  potassium chloride + water
III. potassium hydrogencarbonate + hydrochloric acid  potassium chloride + carbon dioxide + water

  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
6. Which of the following word equations is correct for making ammonium nitrate salt?


  • A. ammonia + nitric acid  ammonium nitrate
  • B. ammonia + nitric acid  ammonium nitrate + water
  • C. ammonium hydroxide + nitric acid  ammonium nitrate + hydrogen + water
  • D. ammonium hydroxide + sodium nitrate  ammonium nitrate + sodium hydroxide
7. Which of the following statements about acids is true?
  • A.   All metals can react with acids to form salt and hydrogen.
  • B.   Acids are substances which all contain oxygen.
  • C.   Acids always have a pH of more than 7 in aqueous solutions.
  • D.   An acid reacts with a base to form salt and water.
8. Which combination of compounds below can react to form sodium sulphate(VI) salt?
  • A.   Na and H2S
  • B.   Na and SO2
  • C.   NaOH and H2SO4
  • D.   NaHCO3 and H2SO3
9. Which of the following species is not amphiprotic?
  • A.   H2O
  • B.   HCO3-
  • C.   HSO3-
  • D.   SO42-
10. In the dissociation of sulphuric acid in water, as shown by the equations below, which species is amphiprotic?

H2SO4 + H2O  HSO4- + H3O+

HSO4- + H2O ⇌ SO42- + H3O+

  • A.   H2O
  • B.   SO42-
  • C.   HSO4-
  • D.   H2SO4