Question

Green vitriol is
A.${\text{CuS}}{{\text{O}}_{\text{4}}}$
B. ${\text{CuS}}{{\text{O}}_{\text{4}}}.7{{\text{H}}_2}{\text{O}}$
C. ${\text{CuS}}{{\text{O}}_{\text{4}}}.5{{\text{H}}_2}{\text{O}}$
D. ${\text{FeS}}{{\text{O}}_{\text{4}}}.7{{\text{H}}_2}{\text{O}}$

Answer 1

Vitriol is the chemical name for a class of compounds mainly sulfates of certain metals which are iron or copper. The hydrated sulphate of metal is known as vitriol. Green vitriol is the hydrated sulphate of iron metal.

Complete answer:
Certain chemical compounds that are hydrated sulphates or sulphuric acid of metals are known as vitriol. Vitriols are found in the form of crystals.
As the vitriols are hydrated sulphate so, option (A) is incorrect.
The hydrated copper (II) sulphate is known as blue vitriol. The blue vitriol is also known as Roman vitriol.so, options (B) and (C) are incorrect.
The green vitriol has iron metal. So, the green vitriol is the hydrated sulphate of iron (II) metal. The green vitriol is found as copperas in nature. The common name of green vitriol is Hara Kasis.
The formula of green vitriol is ${\text{FeS}}{{\text{O}}_{\text{4}}}.7{{\text{H}}_2}{\text{O}}$.

So, the option (D) is correct.

Additional Information: Sulphuric acid is known as oil of vitriol which is corrosive.
Heptahydrate zinc sulphate is known as white vitriol.
Heptahydrate cobalt sulphate is known as red vitriol.
Black vitriol is a mixture of cobalt, manganese, iron etc.
Aluminium sulphate is known as the vitriols of clay.
Diethyl ether is known as the sweet oil of vitriol.
Vitriols are used to produce sulphates, fertilizers, to clean metal surfaces. To dehydrate alcohols to corresponding alkanes.

Note: The metal in vitriol is identified by the colour of the vitriol. Iron (II) sulphate is known as vitriol of mars. The green vitriol is used in iron deficiency in medicine. The green vitriol is formed by evaporating the water saturated with iron sulphate.