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# The formulae of Blue vitriol is

$(a)\;CuSO_4.H_2O \\(b)\;2CuSO_4.2H_2O \\(c)\; CuSO_3.H_3O \\(d)\;CuSO_4.H_2O_2$

The formulae of Blue vitriol is $CuSO_4.H_2O$
Hence a is the correct answer.