Q. Baking soda or baking powder is

 1610  217 AIIMSAIIMS 2000The s-Block Elements Report Error

Solution:

Baking soda is sodium bicarbonate (NaHCO3 ). It is obtained as the intermediate product in the Solvay ammonia soda process. Normal carbonate can be changed to bicarbonate by passing CO2 through its saturated solution.
Na2CO3 + H2O + CO2 2NaHCO3