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.
