What is the number of water molecules present in a Ferrous Sulphate crystal

Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are

Which of the following is present in maximum amount in acid rain?

Nature of calcium phosphate present in tooth enamel is :

Which one of the following salts does not possess water of crystallization?

The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by–