How does lime reduce sulfur dioxide emissions from the burning of coal?
A)It reacts with the sulfur dioxide to form calcium sulfite solid that can be precipitated.
B)It reduces the sulfur dioxide to elemental sulfur that is harmless to the environment.
C)It oxidizes the sulfur dioxide to tetrathionate that is highly water soluble so it can be scrubbed from the emission gases.
D)It catalyzes the conversion of sulfur dioxide to sulfur trioxide which is much less volatile and can be removed by condensation.
E)It converts S to solid, elemental sulfur.

Question

How does lime reduce sulfur dioxide emissions from the burning of coal?
A)It reacts with the sulfur dioxide to form calcium sulfite solid that can be precipitated. 
B)It reduces the sulfur dioxide to elemental sulfur that is harmless to the environment. 
C)It oxidizes the sulfur dioxide to tetrathionate that is highly water soluble so it can be scrubbed from the emission gases. 
D)It catalyzes the conversion of sulfur dioxide to sulfur trioxide which is much less volatile and can be removed by condensation. 
E)It converts S to solid, elemental sulfur.

Quizplus · Accepted Answer

Lime (calcium oxide) reacts with sulfur dioxide (SO2) in the flue gas of coal-fired power plants to form calcium sulfite (CaSO3) solid, which can be precipitated and removed from the emissions. This process is known as flue gas desulfurization (FGD) and is a common method to reduce SO2 emissions from coal combustion. The calcium sulfite can also be oxidized further to form calcium sulfate (CaSO4), which is gypsum, a useful by-product that can be used in construction materials.

How Does Lime Reduce Sulfur Dioxide Emissions from the Burning