question_answer

  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. [NCERT Exemplar]

Answer:

                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