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Answer: Ferrous sulphate is the chemical name used in science for green vitriol. It is crystalline and solid. It has a blue-green hue to it.
The heptahydrate of ferrous sulphate is green vitriol. Thus, its chemical is FeSO4.7H2O as it is mostly found in hydrated form only where the number of water molecules can change depending on the amount of temperature and pressure.
Green vitriol is used on vines, fruit trees, berries, decorative plants, and other plants to prevent and treat iron chlorosis.
