AQA A‑Level Chemistry questions by topic

June 2025 Paper 1, question 03.1: Deduce the number of unpaired electrons in a Cu2+ ion. [1 mark]

June 2025 Paper 1, question 03.2: Describe how water acts as a ligand in the formation of [Cu(H2O)6]2+ [1 mark]

June 2025 Paper 1, question 03.3: A solution of sodium carbonate is added to a blue solution containing [Cu(H2O)6]2+ ions. State what is observed. Give an equation for the reaction. [2 marks] Ob

June 2025 Paper 1, question 03.4: When a solution containing [Cu(H2O)6]2+ ions reacts with an excess of concentrated hydrochloric acid, a ligand exchange reaction occurs. [Cu(H2O)6]2+(aq) + 4 Cl

June 2025 Paper 1, question 03.5: An excess of water, followed by an excess of concentrated aqueous ammonia, is added to a solution containing [CuCl4]2– ions. State what is observed. Give an equ

June 2025 Paper 1, question 03.6: Give an equation for the reaction between C2O42– ions and MnO4– ions in acidic solution. [1 mark]

June 2025 Paper 1, question 03.7: Calculate the mean titre from the student’s results. [1 mark] cm3

June 2025 Paper 1, question 03.8: Calculate the Mr of M2[Cu(C2O4)2(H2O)2] Identify M. [7 marks] Mr of M2[Cu(C2O4)2(H2O)2] Identity of M

June 2025 Paper 1, question 03.9: Draw the structure of two stereoisomers of the complex ion in M2[Cu(C2O4)2(H2O)2] and include the charge on each structure. [2 marks] Structure 1 Structure 2