(i) (1) When the temperature of the reactants is increased, the reactant molecules start moving with more velocity and their kinetic energy increases. As a result, the number collisions increases. Hence, the rate of chemical reaction increases.
(2) Lime stone on heating decomposes to give CO2, which turns 1ime water milky. On the other hand, the lime water does not turn milky before heating the lime stone: because of the zero rate of reaction. The above observation indicates that the rate of a reaction increases on increasing the temperature.
(ii) Solid CaCO3 does not decompose at room temperature when heated, it decomposes to give CaO and CO2 that means the rise in temperature increases the rate of reaction. CaCO3 room temperature No chemical reaction.
