Final answer:
The most common method for removing sulfur dioxide from flue gas involves the use of a lime or limestone wet scrubber system. This method prevents the conversion of sulfur dioxide into sulfur trioxide and the subsequent formation of acid rain.
Step-by-step explanation:
The most common processes for the removal of sulfur dioxide (SO2) from flue gas typically involve the use of lime or limestone and are known as wet scrubber systems. The process works by first blowing calcium carbonate into the combustion chamber where it decomposes into calcium oxide (lime) and carbon dioxide. This lime then reacts with SO2 produced during combustion, forming calcium sulfite. Following this, a suspension of lime is injected to produce a slurry, which removes SO2 and any remaining unreacted sulfur dioxide from the flue gas. The scrubbing system prevents the conversion of SO2 to sulfur trioxide (SO3) and its subsequent reaction with rainwater, which would result in acid rain, a harmful environmental phenomenon.
Therefore, the correct option for the removal of sulfur dioxide from flue gas is: c. Involve the use of lime, limestone or sulfuric acid. While it is possible to also achieve the removal of sulfur trioxide, the production of a useful end product and the injection of limestone directly into the furnace are not inherent or required aspects of all SO2 removal processes.