AIIMS 2018 Physics Lens Formula MCQ Question

Option C is correct because it accurately reflects the principle of conservation of mass in a chemical reaction, where the total mass of reactants equals the total mass of products. In contrast, options A, B, and D may misrepresent this principle by suggesting that mass is lost or gained during the reaction, which contradicts the law of conservation of mass. Understanding this concept is crucial for analyzing chemical equations, such as the reaction between H₂O and CO₂, where the mass before and after the reaction remains constant.