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Home Objective Questions Question Answer
EXAM PREPARATION

Objective Question & Answer

QUESTION

Objective Question

Q.1
The indicator used in C.O.D. test is
A
starch
B
phenolphthalein
C
ferrous ammonium sulphate
D

ferroin
Answer ( Option D)

ferroin

Solution
Indicator used in COD test of waste water is ferroin
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