Chemical oxygen demand is determined by ...

Chemical oxygen demand is determined by using

Methyl organe

`K_2Cr_2O_7 + 50 % H_2SO_4`

`CaOCl_2 + 50 %H_2SO_4`

`Alum +CaO`

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The correct Answer is:

`K_(2)Cr_(2)O_7 + 50 % H_(2)SO_(4)`

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