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B
ZnSO4⋅4H2O
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C
ZnSO4⋅6H2O
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D
ZnSO4⋅7H2O
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Solution
The correct option is DZnSO4⋅7H2O
Option (D) is correct.
White vitriol is ZnSO4.7H2O.
Zinc sulfate heptahydrate, the mineral goslarite, was historically known as "white vitriol" and can be prepared by reacting zinc with aqueous sulfuric acid. Zinc sulfate heptahydrate is used in making lithopone, as a mordant in dyeing, as a preservative for skins and leather and in medicine as an astringent and emetic.