Question

which contain 7 molecule of crystallization ​

Answer 1

Answer:

ferrous sulphate

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Answer 2

it's your ans-

Crystals of ferrous sulphate contains 7(seven) water molecules. Because of it the chemical formula of ferrous sulphate is FeSO4 . 7 H2. Since ferrous sulphate contains seven (7) water molecules, thus it is also called ferrous sulphate heptahydrate.

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