The scrubbers in coal-burning power plants use _____ to trap SO₂. A) NO₂ B) ZnO C) CaCO₃ D) CaSO₄ E) CaO

Question

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The most commonly used scrubber in coal-burning power plants is limestone or CaO. When the sulfur dioxide (SO2) in the flue gas reacts with the CaO, it forms calcium sulfite (CaSO3) and water. The calcium sulfite is then oxidized further to form calcium sulfate (CaSO4), which is a solid that can be disposed of easily.

The Scrubbers in Coal-Burning Power Plants Use _____ to Trap