plumiFormulae of ionic compounds: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 2.1.2.1 Formulae of ionic compounds, 2016–2025, with mark schemes and examiner’s reports where available.
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Q2(a)(iii)
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All 8 questions on Formulae of ionic compounds, as a list
- June 2024, AS Paper 2, Q2(a)(iii) (2 marks): Mg forms 2+ ions but Cl usually forms 1– ions in their reactions. Explain why. [2]
- June 2023, Paper 3, Q4(a) (1 mark): Predict the formula of a Tutton’s salt containing different ions from (NH4)2Cu(SO4)2 • 6H2O. [1]
- June 2022, Paper 1, Q6 (1 mark): Prussian blue, C18Fe7N18, is a deep blue pigment containing Fe2+, Fe3+ and CN− ions. 6 What are the numbers of Fe2+ and Fe3+ ions in one formula unit of C18Fe7N
- November 2020, AS Paper 1, Q2 (1 mark): What is the formula of silver carbonate? A AgCO3 B Ag(CO3)2 C Ag2CO3 D Ag3CO3 Your answer [1]
- June 2019, AS Paper 1, Q8 (1 mark): 3−. 8 A phosphate(V) ion has the formula PO4 What is the formula for copper(I) phosphate(V)? A Cu(PO4)5 B Cu5PO4 C Cu(PO4)3 D Cu3PO4 Your answer [1]
- June 2018, Paper 1, Q6 (1 mark): In the Periodic Table, element X is in Group 2 and element Y is in Group 15 (5). What is the likely formula of an ionic compound of X and Y? A X2Y5 B X2Y3 C X3Y
- June 2018, AS Paper 1, Q1 (1 mark): The electron configuration of element X is: 1s22s22p63s23p4 1 What is the formula of a compound formed when sodium reacts with element X? A NaX B NaX2 C Na2X D
- June 2016, AS Paper 1, Q2 (1 mark): What is the formula of ammonium sulfide? A NH4S B NH4SO4 C (NH4)2S D (NH4)2SO4 Your answer [1]
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