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What is the test for chlorine gas? A - OCR Gateway - GCSE Chemistry - Question 2 - 2023 - Paper 2

Question 2

What is the test for chlorine gas? A. Damp universal indicator paper turns red then white B. Decolourises bromine water C. Limewater turns milky D. Relights a glowin... show full transcript

Worked Solution & Example Answer:What is the test for chlorine gas? A - OCR Gateway - GCSE Chemistry - Question 2 - 2023 - Paper 2

Step 1

A. Damp universal indicator paper turns red then white

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Answer

This statement is incorrect. Chlorine gas turns damp litmus paper from blue to red due to its acidic nature, but the indicator does not turn white.

Step 2

B. Decolourises bromine water

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Answer

This is a correct statement. Chlorine gas reacts with bromine water, decolourising it due to the oxidation of bromide ions to bromine.

Step 3

C. Limewater turns milky

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Answer

This statement is incorrect. Limewater turning milky is a test for carbon dioxide, not chlorine gas.

Step 4

D. Relights a glowing splint

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Answer

This statement is incorrect for chlorine gas. A glowing splint is used to test for oxygen, as it reignites in the presence of oxygen.

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What is the test for chlorine gas? A - OCR Gateway - GCSE Chemistry - Question 2 - 2023 - Paper 2

Worked Solution & Example Answer:What is the test for chlorine gas? A - OCR Gateway - GCSE Chemistry - Question 2 - 2023 - Paper 2

A. Damp universal indicator paper turns red then white

B. Decolourises bromine water

C. Limewater turns milky

D. Relights a glowing splint

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