Question

Molecular formula for green vitriol is

• A. $CuSO_{4}\cdot H_{2}O$
• B. $CuSO_{4}\cdot 7H_{2}O$
• C. $FeSO_{4}\cdot 7H_{2}O$
• D. $FeSO_{4}\cdot H_{2}O$

Hint:

Green = Iron (Ferrous); Blue = Copper (Cupric).

Answer 1

The Correct Option is C

Step 1: Concept
"Vitriol" is an archaic name for various sulfate minerals or chemical compounds.

Step 2: Meaning
Green vitriol is the common name for the heptahydrate form of ferrous sulfate.

Step 3: Analysis
The chemical formula for ferrous sulfate heptahydrate is $FeSO_{4}\cdot 7H_{2}O$. In contrast, $CuSO_{4}\cdot 5H_{2}O$ is known as blue vitriol.

Step 4: Conclusion
Therefore, $FeSO_{4}\cdot 7H_{2}O$ is the correct molecular formula for green vitriol.

Final Answer: (C)