Stoichiometric Equation and Reaction

A stoichiometric equation is a balanced chemical equation that represents the quantitative relationship between the amounts of reactants and products in a chemical reaction. It shows the ratio of moles or molecules of the substances involved.

Reaction Corresponding to Stoichiometric Equation

The reaction corresponding to a stoichiometric equation is the actual chemical process that occurs when the reactants combine to form the products indicated in the equation. It represents the specific rearrangement of atoms and bonds that leads to the formation of new substances.

Elementary and Non-elementary Reactions

- Elementary Reactions: These are simple and indivisible reactions that involve a single step. They represent the molecular level events and can be written as a single balanced equation. For example, the decomposition of hydrogen peroxide:
2H2O2 -> 2H2O + O2

- Non-elementary Reactions: These reactions involve multiple steps and are composed of a series of elementary reactions. They cannot be represented by a single balanced equation. Instead, a mechanism is used to describe the sequence of elementary steps that occur. Non-elementary reactions are more complex and require a deeper understanding of reaction kinetics.

Reaction Classification

- Heterogeneous Reactions: These reactions involve reactants and products in different phases. For example, the reaction between a solid metal and a gaseous substance:
Fe(s) + 2HCl(g) -> FeCl2(s) + H2(g)

- Homogeneous Reactions: These reactions involve reactants and products in the same phase. For example, the reaction between two aqueous solutions:
AgNO3(aq) + NaCl(aq) -> AgCl(s) + NaNO3(aq)

Conclusion

The reaction corresponding to a stoichiometric equation can be either elementary or non-elementary, depending on whether it can be represented by a single balanced equation or requires a mechanism. It can also be classified as a heterogeneous or homogeneous reaction based on the phase of the reactants and products. In the case of the given options, the correct answer is option 'B' - Elementary, as it refers to reactions that can be represented by a single balanced equation.