Which concentrated acid oxidises sulphur directly to sulphuric acid? Write the equation for the same. What is the name of the process by which sulphuric acid is manufactured? Name the catalyst used in the process.
Concentrated nitric acid directly oxidises sulphur to sulphuric acid as shown below:
S + 6HNO3 H2SO4 + 6NO2 + 2H2O
Sulphuric acid is manufactured by the contact process. Platinum or vanadium pentaoxide is commonly used as the catalyst in this process.