Wagner test is used for the screening of which of the following poisons?
Question and options
Wagner test is used for the screening of which of the following poisons?
- Cocaine
- Amphetamine
- Phencyclidine
- Barbiturates
Answer and explanation
Correct answer: A - Cocaine
Wagner's reagent (iodine in potassium iodide) is a general alkaloid precipitating reagent, used for screening alkaloids like cocaine (reddish-brown precipitate). Amphetamine, phencyclidine and barbiturates are synthetic drugs rather than plant alkaloids and are screened with other colour reagents.
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