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Chemistry 5070 · Cambridge (CAIE) O Level

Gas Tests

8 past-paper questions on Gas Tests · examined 2021–2025.

20251 question

5070/21 · M/J · Q1(c) [1]Sign up to mark my answer →

State which salt reacts with warm aqueous sodium hydroxide and aluminium foil to give a gas that turns damp red litmus paper blue.

20233 questions

5070/32 · O/N · Q2(a) [4]Sign up to mark my answer →

You are provided with solid Y and solution Z. Do the following tests on each substance, recording all of your observations at each stage. Tests on solid Y (a) Put the sample of Y in a boiling tube and use a measuring cylinder to add 8 cm3 of dilute nitric acid. Record your observations. Test the gas given off. Describe the test and its result. Identify the gas.

5070/32 · O/N · Q2(e) [3]Sign up to mark my answer →

Tests on solution Z (e) Put 1 cm depth of Z into a boiling tube. Add 1 cm depth of aqueous sodium hydroxide. Gently warm the mixture. Test the gas given off. Describe the test and its result. Identify the gas.

5070/42 · M/J · Q3(b)(i) [3]Sign up to mark my answer →

Predict the identity of the gas produced in test 1. Describe how the student tests the gas to confirm its identity.

20223 questions

5070/42 · O/N · Q2(c) [2]Sign up to mark my answer →

Describe the test used to identify oxygen gas.

5070/42 · O/N · Q3(c)(i) [2]Sign up to mark my answer →

Describe the test used to identify hydrogen.

5070/42 · M/J · Q4(b)(ii) [4]Sign up to mark my answer →

Describe tests used to identify the gases produced.

20211 question

5070/22 · O/N · Q2(b) [2]Sign up to mark my answer →

Describe a test for carbon dioxide.

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