Sulfur dioxide (SO$_2$) is produced when some fossil fuels are burned.
Which of the following statements is true?
Sulfur dioxide can be removed from waste gases in a power station by an acid-base reaction with calcium oxide.
2 )
Sulfur dioxide is insoluble in water.
3 )
Sulfur dioxide is a basic oxide.
4 )
Sulfur dioxide is an ionic compound.
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