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500 ml of a sample COD of water required...

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

Text Solution

Verified by Experts

The correct Answer is:
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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