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Blue vitriol is the common name of which hydrated salt?
AIron (II) sulphate heptahydrate
BMagnesium sulphate heptahydrate
CCalcium sulphate dihydrate
DCopper (II) sulphate pentahydrate
Answer & Solution
Correct answer: D. Copper (II) sulphate pentahydrate
1. Blue vitriol is a blue crystalline hydrated salt.
2. Its IUPAC name is copper (II) sulphate pentahydrate with formula CuSO4.5H2O.
3. Green vitriol is iron (II) sulphate heptahydrate and gypsum is calcium sulphate dihydrate, so those are different salts.
4. Therefore blue vitriol is copper (II) sulphate pentahydrate.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 9 Solutions "Hydrated salts", p.137_
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