In the process of desulfurization of flue gas,

is passed through an absorber containing slaked lime in the presence of

The final product is​

Correct option is C

​Current awareness of the effects of environmental pollution has been instrumental in the development of desulfurization processes. This includes desulfurization of fossil fuels and flue gases from a variety of sources.

The aim in a flue gas desulfurization process is to optimize the removal of SO₂ from emissions into the atmosphere. One important method of desulfurization in commercial operation throughout the world is based upon the neutralization reactions between Ca(OH)₂ or CaCO₃ and sulfuric acid. General equations for the neutralization reactions are:

The reactions shown below remove >90% of the SO₂ produced at a power station.

is non-toxic and is not a waste product. It has a number of commercial applications, for example in the production of plaster of Paris and cement.