Exam (elaborations)
ACTUAL OCR 2024 OCR AS Level CHEMISTRY A May-June 2024 Question Paper 1 WITH MARK SCHEME
ACTUAL OCR 2024 OCR AS Level CHEMISTRY A May-June 2024 Question Paper 1 WITH MARK SCHEME
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SECTION A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 Which diagram shows a p‑orbital?
A
B
C
D
Your answer [1]
2 Which row shows the atomic structure of 25Mg2+?
Protons Neutrons Electrons
A 10 12 13
B 10 15 12
C 12 13 10
D 12 13 14
Your answer [1]
© OCR 2024
, 3
3 A nitrogen oxide contains 36.84% of nitrogen by mass.
What is the empirical formula of the nitrogen oxide?
A NO
B NO2
C N2O
D N2O3
Your answer [1]
4 Carbon monoxide reacts with oxygen to form carbon dioxide:
2CO(g) + O2(g) 2CO2(g)
Which volumes of CO(g) and O2(g) produce the largest volume of CO2(g)?
All gas volumes are measured at RTP.
A 1.00 dm3 CO and 4.00 dm3 O2
B 2.00 dm3 CO and 3.00 dm3 O2
C 3.00 dm3 CO and 2.00 dm3 O2
D 4.00 dm3 CO and 1.00 dm3 O2
Your answer [1]
5 Which reaction produces a product with linear molecules?
A 2B + 3F2
B C + O2
C 2H2 + O2
D N2 + 3H2
Your answer [1]
© OCR 2024 Turn over
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