The chemical formula of white vitriol is

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${CuSO}_{4} . 5 H_{2} O$

${FeSO}_{4} . 7 H_{2} O$

${ZnSO}_{4} . 7 H_{2} O$

${MgSO}_{4} . 7 H_{2} O$

answer is B.

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Detailed Solution

Vitrols are the sulphate compounds of certain metals. White vitriol is the compound of Zinc (Zn) which is the element of d-block. It is chemically known as zinc sulphate but it exits in hydrated form as zinc sulphate heptahydrate. Its molecular weight when it is monohydrate is 179.47 g/mol. Its molecular weight in heptahydrate form is 287.53 g/mol.
White vitriol is a crystalline solid or a white powder when there are no water molecules present. It may dissolve in both alcohol and water. Anhydrous zincate, also known as heptahydrate zinc sulphate, is a crystalline, colourless solid. Because of its extremely high boiling point, this chemical is non-combustible.
The chemical formula of White vitriol is -

${ZnSO}_{4} . 7 H_{2} O$

Hence, option B is correct.

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