Chemistry
The main use of salt in the diet is to

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

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Chemistry
The lustre of the metals is because of

Absorption of light due to the presence of cavities
Reflection of light due to the presence of free electrons
High polish
High density, due to closed packing of atoms

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