A-Level Chemistry (AQA): Free Mock Test & Practice Questions

A-Level Chemistry (AQA)

Physical, inorganic and organic chemistry. AQA board.

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Q1. What is the relative charge and relative mass of a proton?

A. Charge +1, relative mass 1
B. Charge -1, relative mass 1
C. Charge +1, relative mass 1/1836
D. Charge 0, relative mass 1

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✓ Answer: A. Charge +1, relative mass 1

A proton has a relative charge of +1 and a relative mass of 1 (approximately 1.67 x 10^-27 kg, the reference mass unit). The electron has the tiny mass of 1/1836, not the proton, which is a common mix-up.

Q2. Which statement about bond enthalpies used in Hess's law calculations is correct?

A. Mean bond enthalpies are averaged over many different molecules, so calculations using them give only approximate values
B. Bond enthalpies are always exact for every molecule containing that bond type
C. Bond breaking is exothermic and bond forming is endothermic
D. Bond enthalpy calculations give more reliable values than using enthalpies of formation

Show answer & explanation

✓ Answer: A. Mean bond enthalpies are averaged over many different molecules, so calculations using them give only approximate values

Mean bond enthalpies are averages taken across a range of different compounds, so the specific bonding environment in a molecule causes the calculated ΔH to differ from the experimental value. Bond breaking actually requires energy (endothermic) while bond forming releases energy (exothermic) — the reverse of option C.

Q3. 25.0 cm3 of a solution of Fe2+ required 22.50 cm3 of 0.0200 mol dm-3 acidified KMnO4 for complete oxidation, following MnO4- + 5Fe2+ + 8H+ → Mn2+ + 5Fe3+ + 4H2O. What is the concentration of the Fe2+ solution in mol dm-3?

A. 0.0180 mol dm-3
B. 0.0900 mol dm-3
C. 0.0225 mol dm-3
D. 0.1125 mol dm-3

Show answer & explanation

✓ Answer: B. 0.0900 mol dm-3

Moles MnO4- = 0.02250 dm3 × 0.0200 mol dm-3 = 4.50 × 10-4 mol; moles Fe2+ = 5 × 4.50 × 10-4 = 2.25 × 10-3 mol; concentration = 2.25 × 10-3 / 0.0250 = 0.0900 mol dm-3. Forgetting to multiply by the 1:5 mole ratio gives the incorrect answer of 0.0180 mol dm-3.

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A-Level Chemistry (AQA) — common questions

Frequently asked

How many questions are in the A-Level Chemistry (AQA)?

The exam has 40 questions. Every Revision Robin mock uses the same 40-question format so your practice matches the real thing.

What is the pass mark for the A-Level Chemistry (AQA)?

You need 24 out of 40 correct to pass, which is about 60%. Our mocks mark you against this exact threshold.

How long do you get?

The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.

Are these the real exam questions?

No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with AQA.