plumiInorganic chemistry and the periodic table: OCR A‑Level Chemistry B questions
Every OCR A-Level Chemistry B exam question on OZ Inorganic chemistry and the periodic table (specification points OZ(i)), 2016–2025, with its mark scheme and examiner’s report.
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Q2(a)
The whole paper ↗![June 2024 AS Paper 2, question 2(a): The concentration of ozone in part of the atmosphere is 0.000 021%. Calculate this concentration of ozone in ppm. concentration = ppm [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-02-a-qp.webp?v=3)
Q5(f)
The whole paper ↗![June 2022 Paper 2, question 5(f): Calculate the ppm by mass of fluorine in pure fluoroapatite, Ca5(PO4)3F. ppm by mass = [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun22-05-f-qp.webp?v=3)
Q22(a)(ii)
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Q3(g)(i)
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All 11 questions on Inorganic chemistry and the periodic table, as a list
- June 2025, Paper 1, Q21 (1 mark): A gaseous mixture contains 3.803 × 10–5 moles of Cl 2 molecules per dm3. 1.00 dm3 of the mixture has a mass of 1.35 g. What is the concentration of Cl 2 molecul
- June 2024, Paper 1, Q13 (1 mark): The Table shows the concentrations of some noble gases in the atmosphere. Gas Concentration by volume He 5 ppm 2 parts in 105 Ne Kr 0.0001% 1 part in 107 Xe Whi
- June 2024, AS Paper 1, Q13 (1 mark): The table shows the tropospheric abundance and greenhouse factors for carbon dioxide and methane. The greenhouse factor measures the relative contribution to th
- June 2024, AS Paper 2, Q2(a) (1 mark): The concentration of ozone in part of the atmosphere is 0.000 021%. Calculate this concentration of ozone in ppm. concentration = ppm [1]
- June 2023, AS Paper 1, Q5 (1 mark): A student looks up the concentrations of two gases in a sample. The concentration of gas Y is given as 0.0001% and the concentration of gas Z is given as 1 ppm.
- June 2022, Paper 2, Q5(f) (2 marks): Calculate the ppm by mass of fluorine in pure fluoroapatite, Ca5(PO4)3F. ppm by mass = [2]
- June 2022, AS Paper 1, Q22(a)(ii) (1 mark): According to the EPA, exposure to 0.07 ppm of ozone for 8 or more hours is dangerous. A scientist measures the ozone concentration in the air of a town as 1.0 ×
- November 2021, AS Paper 1, Q19 (1 mark): A sample of air contains 0.0367% CO2 and 1.8 ppm of CH4. What is the correct ratio of CO2 to CH4 in the sample of air (to 1 significant figure)? A 0.005:1 B 0.0
- June 2019, Paper 1, Q10 (1 mark): The abundance of various gases in the air is shown in the table. Gas Abundance (by volume) N2 78% 3.7 × 10–2% CO2 CH4 1.8 ppm Which statement about the table is
- June 2018, Paper 1, Q21 (1 mark): The methane concentration in the atmosphere has increased from 0.722 ppm in pre-industrial times to 1.80 × 10–4 % now. What is the % increase in methane concent
- June 2018, AS Paper 2, Q3(g)(i) (1 mark): The ozone percentage concentration in the stratosphere is 0.000021% by volume. Calculate the concentration of ozone in ppm (parts per million). ozone concentrat
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