Q.

Which of the following is known as blue vitriol?

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a

FeSO47H2O

b

CuSO45H2O

c

ZnSO47H2O

d

FeSO45H2O

answer is C.

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Detailed Solution

CuSO4 changes from a white solid to a crystalline form with the chemical formula CuSO45H2O when water is introduced. The Pentahydrate is hence blue. Blue Vitriol, also known as hydrated copper sulphate, is a frequent name.

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