Question

A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dil H₂SO₄, but gives no precipitate with NaCl. The metal salt solution will consist of
(a) PbCO₃
(b) BaCO₃
(c) MgCO₃
(d) CaCO₃

Answer 1

Answer: Barium carbonate

BaCO3+2CH3COOH⟶Ba(CH3COO)2+CO2+H2OBaCO3+2CH3COOH⟶Ba(CH3COO)2+CO2+H2O

Ba(CH3COO)2+K2CrO4⟶BaCrO4↓(Yellow ppt.)+2KOOCCH3Ba(CH3COO)2+K2CrO4⟶BaCrO4↓(Yellow ppt.)+2KOOCCH3

BaCO3+H2SO4⟶BaSO4↓(White ppt.)+2CO2+2H2O