Valid industrial uses of sulfuric acid

Steps:

• Evaluate use 1: Sulfuric acid digests lignin in wood pulp but does not act as a bleach, which requires oxidative agents like chlorine dioxide.
• Evaluate use 2: Sulfuric acid is corrosive and toxic, unsuitable as a food preservative in tinned foods, where safer agents like salt or citric acid are used.
• Evaluate use 3: Sulfuric acid serves as a sulfonating agent in detergent production, reacting with alkylbenzenes to form sulfonates.
• Evaluate use 4: No information provided on use 4, but options confirm it is not a correct use.

Why D is correct:

• Sulfuric acid is used in the sulfonation reaction (ArH + H2SO4 → ArSO3H) to produce surfactants for detergents.

Why the others are wrong:

• A includes incorrect use 1 (not a bleach) and correct 3, but overall invalid.
• B includes incorrect uses 2 (not a food preservative) and 4 (undefined but wrong).
• C includes only incorrect use 2.

Final answer: D