How are the reactions classified on the basis of rates of reactions? Give examples.

Question: What are the three classifications of reactions based on their rates, and provide an example for each classification. Answer: The three classifications of reactions based on their rates are: 1. Fast reactions: These occur rapidly, often within fractions of a second, and usually release large amounts of energy. For example, the combustion of hydrogen in air: \[2H_2(g) + O_2(g) \rightarrow 2H_2O(g)\] 2. Moderate reactions: These reactions take place at a noticeable but not extremely rapid pace, lasting from a few seconds to several minutes. For example, the precipitation of silver chloride from its soluble components: \[AgNO_3(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_3(aq)\] 3. Slow reactions: These reactions take a considerable amount of time to occur, from a few hours to days, months, or even years. For example, the formation of rust on iron in the presence of water and oxygen: \[4Fe(s) + 3O_2(g) + 6H_2O(l) \rightarrow 4Fe(OH)_3(s)\]