Chemistry
The manufacture of iron from iron ore involves the process of

Fractional distillation
Oxidation
Reduction
Electrolysis

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Chemistry
Table salt gets moist during rainy season because

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

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Chemistry
The main use of salt in the diet is to

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

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