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500 ml of a sample `COD` of water required 19.6 mg of `K_(2)Cr_(2)O_(7)` of water sample is
A. 8 ppm
B. 6.4 ppm
C. 16.8 ppm
D. 4.9 ppm

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Correct Answer - 2
`19.6xx10^(-3) g K_(2)Cr_(2)O_(7) …… 500 ml` of `H_(2)O ?......... 10^(6) ml` of `H_(2)O`
`49g` of `K_(2)Cr_(2)O_(7)=8g` of `O_(2)`
`39.2 g` of `K_(2)Cr_(2)O_(7) =?`
`COD=6.4` ppm

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