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Varied Topic Questions, Exercises of Chemistry

Chemistry

Varied Topic Questions Great for Practice in OCR

Typology: Exercises

2025/2026

Uploaded on 06/17/2026

ari-hg9
ari-hg9 🇬🇧

8 documents

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OCR A Level Chemistry A
Topic Test – Gas Tests
Time allowed: 20 minutes
Total marks: 20
Answer all questions.
Question 1 – Identifying Gases (4 marks)
Complete the table below.
Gas
Tes
t
Positive
Result
Hydrogen
Oxygen
Carbon dioxide
Ammonia
(4 marks)
Question 2 – Hydrogen (4 marks)
Hydrogen gas can be produced when magnesium reacts with dilute hydrochloric acid.
(a)
Write the equation for the reaction between magnesium and hydrochloric acid.
(2 marks)
(b)
pf3

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OCR A Level Chemistry A

Topic Test – Gas Tests

Time allowed: 20 minutes Total marks: 20 Answer all questions.

Question 1 – Identifying Gases (4 marks)

Complete the table below. Gas Tes t Positive Result Hydrogen Oxygen Carbon dioxide Ammonia (4 marks)

Question 2 – Hydrogen (4 marks)

Hydrogen gas can be produced when magnesium reacts with dilute hydrochloric acid.

(a)

Write the equation for the reaction between magnesium and hydrochloric acid. (2 marks)

(b)

Describe the test for hydrogen gas and the expected observation. (2 marks)

Question 3 – Oxygen (4 marks)

Oxygen gas can be produced during the decomposition of hydrogen peroxide.

(a)

Describe the test for oxygen gas. (2 marks)

(b)

Explain why the glowing splint relights. (2 marks)

Question 4 – Carbon Dioxide (4 marks)

Carbon dioxide gas is produced when calcium carbonate reacts with dilute hydrochloric acid.

(a)

Write the equation for this reaction. (2 marks)

(b)

Describe the test for carbon dioxide and the observation. (2 marks)