What is the role of sulphuric acid in the synthesis of Nitro benzene?

Sulfuric acid acts as a catalyst in the synthesis of nitrobenzene by nitrating benzene. It facilitates the nitration reaction by protonating the nitric acid, making it a better electrophile for attacking the benzene ring. Sulfuric acid also helps in generating the nitronium ion, which is the active species involved in the nitration process.