Question

The biochemical oxygen demand can be given by ___________

(a) (Dob – Dos)+dilution factor

(b) (Dob – Dos)-dilution factor

(c) (Dob – Dos)/dilution factor

(d) (Dob – Dos)*dilution factor

This question was addressed to me in unit test.

This interesting question is from Problems, Units and Formulae topic in portion Water of Applied Chemistry

Answer 1

The correct choice is (d) (Dob – Dos)*dilution factor

Explanation: The biochemical oxygen demand can be given by (Dob – Dos)*dilution factor where Dob = dissolved oxygen present in blank Dos = dissolved oxygen of sewage after incubation.