IB Chemistry Practice Test sample questions

These starter questions help you launch a chemistry mock test quickly. Swap them with your own worksheet, notebook, or textbook questions any time.

1. What is the shape of a molecule with 4 bonding pairs and 0 lone pairs?
A) Linear  B) Trigonal planar  C) Tetrahedral  D) Bent
2. State Le Chatelier's principle.
A) Equilibrium favours the forward reaction at high temperature  B) A system at equilibrium shifts to oppose any imposed change  C) Pressure only affects gaseous equilibria  D) Kc increases with temperature
3. Calculate the pH of 0.01 mol/dm³ HCl.
A) 1  B) 2  C) 3  D) 4
4. Which compound has the highest boiling point?
A) CH₄  B) NH₃  C) SiH₄  D) PH₃
5. A buffer solution resists change in:
A) temperature  B) concentration  C) pH  D) pressure
6. The standard enthalpy of formation of an element in its standard state is:
A) positive  B) negative  C) zero  D) undefined
7. Which type of reaction forms an ester from an alcohol and carboxylic acid?
A) Addition  B) Substitution  C) Condensation  D) Elimination
8. What is the hybridisation of carbon atoms in ethene (C₂H₄)?
A) sp³  B) sp²  C) sp  D) unhybridised
9. For a reaction with Kc = 0.001 at 298 K, the equilibrium:
A) strongly favours products  B) slightly favours products  C) strongly favours reactants  D) is perfectly balanced
10. What colour are copper(II) ions in aqueous solution?
A) Yellow  B) Green  C) Blue  D) Colourless