Sulfuric acid's role in detergent production

Steps:

• Recall sulfuric acid (H2SO4) is a strong acid used in various industrial processes, especially sulfonation.
• Evaluate option A: Bleaches typically involve oxidizing agents like chlorine, not acids.
• Evaluate option B: Food preservatives are often weak acids like benzoic acid, not concentrated H2SO4.
• Evaluate option C: H2SO4 reacts with alkylbenzenes in sulfonation to form surfactants for detergents.
• Evaluate option D: V2O5 is a catalyst produced in the Contact process for making H2SO4, not vice versa.

Why C is correct:

• Sulfuric acid enables sulfonation of organic compounds, forming alkylbenzene sulfonates essential for detergent surfactants (e.g., H2SO4 + C6H5C12H25 → C6H4(SO3H)C12H25).

Why the others are wrong:

• A: Bleaches use hypochlorite or peroxide, not H2SO4, which is corrosive rather than whitening.
• B: H2SO4's corrosiveness makes it unsuitable for food; preservatives like sulfur dioxide are derived differently.
• D: H2SO4 production uses V2O5 as a catalyst in SO2 to SO3 oxidation, reversing the process.

Final answer: C