Question

Give reason for the following:

The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌} 
between the reactants and products, formed in the chemical reaction.

Answer 1

The reaction is reversible shown by the double arrow.

The Equation of Oxidation of sulphur dioxide to sulphur trioxide is as follows:

\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2 SO3 + \triangle}\]
                    [Vanadium pentoxide (V₂O₅) - catalyst]