<prompt> Ferric chloride test is positive in -Penicillin overdoseSalicylate overdoseDhatura poisoningCannabis poisoning  <response>: Ans. is b i.e., Salicylate overdose Ferric Chloride testo Is used to diagnose cases of Carbolic acid phenol and salicylate overdose.o Adding few drops of 10 ferric chloride solution to 1 ml of sample produces a blue color indicating a positive test. 