The correct answer is [A] Sulphuric acid is prepared using the Contact Process.

• The Contact Process is an industrial method used to produce sulfuric acid on a large scale.
• It involves the oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3) using a catalyst, typically vanadium(V) oxide, and then the subsequent reaction of sulfur trioxide with water to produce sulfuric acid (H2SO4).
• This process is the major method for the production of sulfuric acid in the world today.

[B] Nitric acid is prepared by the Ostwald process, which is a different industrial method.

[C] Hydrochloric acid is prepared by the direct synthesis of hydrogen and chlorine

[D] Benzene is an organic compound, it is not prepared by the contact process

The correct answer is [A] Sulphuric acid