Discussion
Heroin is easily differentiated from its cutting agents by
Answer: B
Heroin is easily told apart from its cutting agents such as caffeine, paracetamol and sugars by thin layer chromatography, because each substance travels a different distance and gives a different Rf value on the plate.
Colour and spot tests are only presumptive and give the same reaction for many opiates. UV-Vis spectra of mixtures overlap, and IR of a mixture shows the sum of the components, which makes it hard to separate heroin from the diluents.
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