(i) When HCl is added to Shahabad stone effervescence of `CO_(2)` is formed.
(ii) The `CO_(2)` effervescence is formed slowly with the pieces of Shahabad tiles while at the faster speed with the powder.
(iii) This is because the rate of a reaction depends upon the size of the particles of the reactants taking part in the reaction.
(iv) Smaller the size of the reactant particles more is the surface area available for the reaction and higher is the rate of reaction.
(v) Hence, it takes time for pieces of Shahabad tiles to disappear in HCl, but its powder disappears rapidly.
