AIIMS 2019 Chemistry Reaction Mechanisms MCQ Question

Option B is correct because it accurately represents the stoichiometry of the chemical reaction, balancing the number of atoms of each element on both sides of the equation. In contrast, options A, C, and D either misrepresent the reactants or products, leading to an imbalance in the conservation of mass, which is a fundamental principle in chemical reactions. For example, if option A shows an incorrect number of H₂O molecules, it fails to maintain the required hydrogen and oxygen balance, while options C and D may misrepresent the formation of byproducts such as CO₂ or other species. Understanding the correct stoichiometric coefficients is essential for predicting the quantities of reactants and products involved in a chemical reaction.