Chemistry
The mass number of a nucleus is

the sum of the number of protons and neutrons present in the nucleus
always less than its atomic number
always more than the atomic weight
a fraction

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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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Chemistry
Peptization is a process of

Dispersing precipitates into colloidal solution
Precipitation of colloidal particles
Protection of colloidal solution
Purification of colloids

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