Chemistry
The BOD values of water indicate the

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

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride is hygroscopic
Sodium chloride is deliquescent
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride contains some quantity of sodium iodide

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