Question

Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.

Answer 1

Baking powder (NaHCO₃), salt A is commonly used in bakery products. On heating, it forms sodium carbonate (Na2CO₃), B and CO₂ gas, C is evolved. When CO₂ gas is passed through lime water it forms calcium carbonate (CaCO₃), which is slightly soluble in water making it milky.
    A---NaHCO₃;         B---Na2CO₃;      C---CO₂ gas