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21. A gaseous mixture of H, and Co, gas ...

21. A gaseous mixture of H, and Co, gas contains 66 mass of Co, The vapour density of the mixture is: (a) 6,1 (b) 5.4 (c) 2.7 (d) 108 A certain public water supply contains 0.10 ppb (part per billion) of chloroform (CHCI). How many molecules of CHCI, would be obtained in 0.478 ml. drop of this water? (assumed d=1/ml) 22.

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