Total removal of the pollutant sulfur dioxide, SO2, is difficult, both for economic and technical reasons. The quantities emitted from furnace...

Total removal of the pollutant sulfur dioxide, SO2, is difficult, both for economic and technical

reasons. The quantities emitted from furnace chimneys can be lowered by using desulfurisation

plants. The gases are scrubbed (washed) with calcium hydroxide to remove the SO2.

What is the main product formed initially?