Discussion
Potassium ferricyanide reagents is used for the detection of which compound of urine ?
Answer: A
Potassium ferricyanide is used to detect creatinine in urine.
Hexacyanoferrate(III), that is potassium ferricyanide, is a recognised reagent for measuring creatinine in urine and blood, and a published patent names it as the preferred creatinine reagent because urea, protein and sugar interfere with it less than with older methods. Creatinine is a normal urinary constituent, which is why it is tested for in urine.
No ferricyanide test was found for the other options: ammonia and urea are detected by other reagents, and THG, tetrahydrogestrinone, is a designer anabolic steroid identified by chromatography and mass spectrometry. The full chemistry of the particular test the paper means could not be confirmed, so the answer rests on this use of the reagent and on the key.
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