Question

question 9
mark this question
the presence of which of the following in the urine is an indication of a bacterial infection?
no
no₃⁻
n2
no₂⁻

Explanation:

Nitrite ($NO_2^-$) in urine is an indicator of bacterial infection. Some bacteria can convert nitrate ($NO_3^-$) to nitrite. This is the principle behind many urine dipstick tests for urinary tract infections.

Answer:

$NO_2^-$