Chemistry
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

1.568 x 103
4.84 x 1017
6.023 x 1023
6.023 x 1019

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Chemistry
The BOD values of water indicate the

Amount of organic debris
Amount of oxygen used for biochemical reduction
Amount of ozone used for biochemical oxidation
Amount of oxygen used for biochemical oxidation

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