Question

Ferrous sulphate is called as:
A.Green vitriol
B.White vitriol
C.Jewellers rouge
D.Glauber's salt

Answer 1

The molecular formula of ferrous sulphate is ${\text{FeS}}{{\text{O}}_{\text{4}}}$. It is crystalline in appearance. Ferrous sulphate is named after the colour of the crystals.

Complete step by step answer:
The crystals of ferrous sulphate are light green in colour.
Vitriol is a chemical name for the chemical substances containing sulphates of metals like iron or copper or zinc.
Thus, ferrous sulphate is called green vitriol.
Thus, the correct option is option (A).

Additional Information:
Uses of green vitriol are as follows:
-Green vitriol is used to treat and prevent the deficiency of iron known as anemia.
-Green vitriol is used as a stool softener for people suffering with constipation.
-Green vitriol is used in manufacturing of inks because of its bright colour.
-Green vitriol is also used for dyeing of wood.
-Green vitriol is used to lower soil pH, treat iron chlorosis, kill moss and lawn conditioner.
-Green vitriol is used in gold refining to precipitate gold from its solutions.
-Green vitriol is used in purification of water by the removal of phosphate and flocculation.
-Green vitriol is used in identification of mushrooms.

Note:
Zinc sulphate $\left( {{\text{ZnS}}{{\text{O}}_{\text{4}}}} \right)$ has white coloured crystals and thus, it is known as white vitriol. Ferric oxide $\left( {{\text{F}}{{\text{e}}_2}{{\text{O}}_3}} \right)$ is known as jewellers rouge. It is also known as red rouge or rouge. It is used for polishing jewellery. Sodium sulphate decahydrate $\left( {{\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \cdot {\text{10}}{{\text{H}}_{\text{2}}}{\text{O}}} \right)$ is known as Glauber's salt. It is used for the removal of paracetamol from the body.