Multiple choice Which of the following combinations of ‘common name : chemical formula’ is not correct? Cementite : Fe3C Glauber’s salt : Na2SO4·10H2O Fool’s gold : CuFeS2 Green vitriol : CuSO4.5H2O Lunar caustic : AgNO3 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Green vitrio l: FeSO4.7H2O Blue Vitriol : CuSO4.5H2O