Chemistry
The presence of Cobalt in Vitamin B12 was established for the first time by

Sodium Nitroprusside test
Borax-Bead test
Hydrolysis test
Spectroscopy

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Chemistry
The main use of salt in the diet is to

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

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Chemistry
The mass number of a nucleus is

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

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