Formula of green Vitriol oil is:

• A. FeSO₄ · 7H₂O
• B. MgSO₄ · 7H₂O
• C. ZnSO₄ · 7H₂O
• D. CuSO₄ · 7H₂O

The formula for green vitriol oil is A. FeSO₄ · 7H₂O. This compound is also known as iron(II) sulfate heptahydrate and is commonly used in various applications, including agriculture and chemistry.

Key Points about Green Vitriol

• Composition: It consists of iron, sulfur, and oxygen, along with water molecules.
• Appearance: Typically appears as blue-green crystals.
• Uses: Often utilized in the production of inks, fertilizers, and as a reducing agent in chemical reactions.

Related Compounds

Other options listed are different sulfate compounds:

• B. MgSO₄ · 7H₂O - Epsom salt, used for gardening and health.
• C. ZnSO₄ · 7H₂O - Zinc sulfate, used in agriculture and dietary supplements.
• D. CuSO₄ · 7H₂O - Copper sulfate, used in agriculture and as a fungicide.