Discussion
Urea nitrate crystal test is used to identify :
Answer: B
The urea nitrate crystal test identifies urine.
Urine contains urea in high concentration. When an extract of a suspected urine stain is treated with concentrated nitric acid, urea nitrate forms and crystallises as characteristic flat, rhombic or hexagonal plates that can be seen under the microscope. The test is a presumptive one, and urine is also recognised by its odour and by creatinine tests.
Semen is identified by acid phosphatase, sperm and prostate-specific antigen, saliva by amylase, and sweat has no simple specific test. None is identified by urea nitrate crystals.
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