Practice Test – 100 Questions

Take a full length practice exam of 100 randomly generated questions. Missed questions are reviewed at the end of the test.

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Distribution Question

Common method used to test water for chlorine residual

A
DPD
B
HTH
C
VOC
D
THM
Question 1 Explanation: 

The most common colorimetric method used today is called the DPD Colorimetric Method. In this method, N,N-diethyl-p-phenyldiamine (DPD) is the reagent added to the sample. Chlorine oxidizes this DPD to form a magenta colored compound known as Wurster Dye.

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