plumiElectronegativity and bond polarity: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 2.2.2.4 Electronegativity and bond polarity, 2016–2025, with mark schemes and examiner’s reports where available.
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All 15 questions on Electronegativity and bond polarity, as a list
- June 2025, AS Paper 1, Q10 (1 mark): Which molecule is polar? A H2S B CO2 C CCl4 D C2F4 Your answer [1]
- June 2024, Paper 1, Q18(b)(ii) (2 marks): Explain why both SO2 and SO3 have polar bonds, but only SO2 has polar molecules. [2]
- June 2024, AS Paper 2, Q1(a) (2 marks): Hydrogen and oxygen have different electronegativities. What is meant by the term electronegativity? [2]
- June 2024, AS Paper 2, Q1(b)(ii) (1 mark): Explain why molecules of H2O are polar. [1]
- June 2023, Paper 1, Q5 (1 mark): Which compound has polar molecules? A HCN B BCl3 C CO2 D C2F4 Your answer [1]
- June 2022, Paper 1, Q14 (1 mark): The three reactions below each form one product only. Which reaction(s) form(s) a product with non-polar molecules? 1 2CO + O2 2 Si + 2Cl 2 3 S + 3F2 A 1, 2 and
- June 2022, AS Paper 1, Q2 (1 mark): What is the meaning of the term electronegativity? A The ability of an atom to attract the electrons in a covalent bond. B The ability of an atom to gain an ele
- November 2021, Paper 1, Q1 (1 mark): Which statement describes electronegativity? A A measure of the reactivity of an element. B The ability of an atom to attract an electron to become a 1– ion. C
- November 2021, Paper 1, Q14 (1 mark): Which statement(s) about a molecule of Cl–N=O is/are correct? 1: It is a polar molecule. 2: It contains 6 lone pairs of electrons. 3: It has a bond angle of 180
- November 2021, AS Paper 1, Q2 (1 mark): Pauling electronegativity values for the halogens F to I and some elements in period 2 of the periodic table are shown below. B C N O F 2.04 2.55 3.04 3.44 3.98
- November 2021, AS Paper 2, Q1(d)(ii) (1 mark): Suggest why SF6 is unreactive. [1]
- November 2020, AS Paper 1, Q1 (1 mark): Which substance contains polar molecules? A C2H4 B CO2 C NCl 3 D SF6 Your answer [1]
- June 2019, Paper 3, Q1(a) (2 marks): Explain why a CF4 molecule has polar bonds but does not have an overall dipole. [2]
- June 2017, AS Paper 1, Q7 (1 mark): Which compound has polar molecules? A OCl2 B BCl3 C CCl4 D SCl6 Your answer [1]
- June 2016, AS Paper 1, Q15 (1 mark): Which compound has non-polar molecules? A E-1,2-dichlorobut-2-ene B E-2,3-dichlorobut-2-ene C Z-2,3-dichlorobut-2-ene D Z-1,4-dichlorobut-2-ene Your answer [1]
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