<Li> Carbonates give a brisk effervescence with dilute H SO due to the release of CO, a colorless gas which turns limewater milky due to formation of CaCO (carbonatation). The milkiness disappears on passing an excess of the gas through the lime water, due to formation of Ca (HCO). </Li> <Li> Acetates give the vinegar - like smell of CH COOH when treated as with dilute H SO . A blood red colouration is produced upon addition of yellow FeCl, due to formation of iron (III) acetate . </Li> <Li> Sulfides give the rotten egg smell of H S when treated with dilute H SO . The presence of sulfide is confirmed by adding lead (II) acetate paper, which turns black due to the formation of PbS . Sulfides also turn solutions of red sodium nitroprusside purple . </Li> <Li> Sulfites produce SO gas, which smells of burning sulfur, when treated with dilute acid . They turn acidified K Cr O from orange to green . </Li>

Qualitative analysis of inorganic salt mixture containing four radicals