Chemistry
In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?

Copper
Iron
Titanium
Aluminium

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Chemistry
The main use of salt in the diet is to

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

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