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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The formula of blue vitriol is;
A
CuSO4.2H20
B
CuCO4.5H2O
C
MgSO4.2H2O
D
Na2SO4.3H2O
Explanation: 

Detailed explanation-1: -The chemical formula of blue vitriol or Cu (II) sulphate pentahydrate is CuSO4. 5H2O. Blue vitriol is a very useful compound. It is used as an analytical reagent, herbicide, or fungicide, and even as battery electrolytes.

Detailed explanation-2: -Copper sulfate pentahydrate | CuSO4. 5H2O-PubChem.

Detailed explanation-3: -What is Copper Sulfate Pentahydrate (CuSO4-5H2O)? Copper Sulfate Pentahydrate is an odorless blue crystal that readily dissolves in water. It is also soluble in methanol, glycerol and slightly soluble in ethanol.

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