Orthotolidine test is used for determination of
A. Dissolved oxygen
B. Residual chlorine
C. Biochemical oxygen demand
D. Dose of coagulant
Answer: Option B
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Orthotolodine test measure only total chlorine by color change to yellow. It doesn't measure free chlorine.
Only color wheel test and digital meter only measures free chlorine.but in the option instead of residual chlorine there should be total chlorine