Question

a compound A is used as antacid and in fire extinguishers and it small amount is used in making bakery items identify the compound and also explain the reason for the above mentioned use of the compound A

Answer 1

Compound A is sodium hydrogencarbonate-NaHCO3
(i) It is used in fire extinguishers because it produces CO2 gas on reaction with acid.
  H2SO4 + 2NaHCO3 ----> Na2SO4 + 2H2O + 2CO2                                                              

(ii) It is used as an antacid because it neutralises excess acid (HCl) present in stomach.
      HCI + NaHCO3 ----> NaCl + H2O + CO2
(iii) It is used in making bakery items because on reaction with acid it produces CO2 gas which makes bread, cakes, etc., soft and spongy.
  NaHCO3 + H+ ------> H2O + CO2 + Na-salt of acid