Chemistry
If lime water is kept in the air, it turns milky due to presence of :

Sulphurdioxide
Carbondioxide
Nitrogen
Oxygen

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Chemistry
The main use of salt in the diet is to

increase the solubility of food particles in water
produce in small amounts the hydrochloric acid required for the digestion of food
ease the process of cooking
make the taste of food better

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Chemistry
The BOD values of water indicate the

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

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