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A few drops of bromine water are added to two test tubes. In one tube the orange colour fades, in the other it stays unchanged. What does the fading tube indicate?
AAn unsaturated compound is present
BA saturated compound is present
CAn alkane is present
DA metal salt is present
Answer & Solution
Correct answer: A. An unsaturated compound is present
1. Bromine water is used to test for unsaturation.
2. An unsaturated compound decolourises bromine water, while a saturated compound does not.
3. The tube where the orange colour fades therefore contains an unsaturated compound; alkanes are saturated, so that option is wrong.
4. Hence the fading tube indicates an unsaturated compound.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.165_
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