SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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squeaky pop test
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damp litmus paper turns red then decolourises
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lit splint test
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None of the above
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Detailed explanation-1: -To test for chlorine, use damp blue litmus paper. The blue colour will turn to red and then to white. Chlorine gas reacts with water to produce an acidic solution which is also an effective bleach. This explains how the test for chlorine works.
Detailed explanation-2: -Chlorine reacts with HCl in the moist litmus paper to form hydrochloric acid. This acid turns the litmus paper red. However, chlorine is a powerful bleach and it bleaches the litmus paper, making it colourless.
Detailed explanation-3: -The test for chlorine can use either type of litmus paper, but blue litmus paper is used most commonly. The litmus paper must be damp-the water dissolves some of the chlorine so that it can react with the indicator on the litmus paper. This test shows that chlorine is a powerful bleach.