Discussion
Following color test is applied for the detection of opiates :
Answer: D
All three colour tests are applied for the detection of opiates, so the answer is option D. Marquis reagent, formaldehyde in sulphuric acid, gives a purple colour with morphine and its relatives, Mecke reagent, selenious acid in sulphuric acid, gives a green colour, and Froehde reagent, molybdic acid in sulphuric acid, gives a purple to green colour. Since each of A, B and C is a test for opiates, the combined option is correct.
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