Answer :

a) CO2 gas is formed here.

Carbonates on reaction with dilute HCl produces metal chloride, water, and CO2 gas.


b) (i) By increase the concentration- According to collision theory on increasing the concentration, the number of reactant molecules per unit volume increases and the number of molecules undergoing effective collisions also increases. So the reactant molecules will react and form product easily. Hence the rate of reaction will increase.


(ii) By increase the surface area- If solids are made into small pieces or powder then their surface area increases and the number of molecules undergoing effective collisions also increases. So reactant molecules will react and form product easily. So the rate of reaction will increase.


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