Question

why blue vitriol is a compound​

Answer 1

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Cupric sulfate, CuSO4, commonly known as blue vitriol, is the most important salt of copper. It usually crystallizes as CuSO4 · 5H2O and has a bright blue colour. It is prepared by the treatment of copper oxides with sulfuric acid. While readily soluble in water.

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Answer 2

Answer:

it is the crystallization form of cu so4.so it is a compound.