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COD of a water sample is 8ppm the weight...

COD of a water sample is 8ppm the weight of acidified `K_(2)Cr_(2) O_(7)` required to oxidise the organie matter present in one litre of water sample is

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The COD value of a water sample is 40 ppm. Calculate the amount of acidified K_(2)Cr_(2)O_(7) required to oxidise the organic matter present in 500 ml of that water sample.

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