Answer:
Compound 'A' is sodium hydrogen carbonate -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 neutralizes
excess acid (HCl) present in stomach.
HCl + NaHCO3 NaCI + 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
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