The characteristic properties of acids and bases — practice question

Sulfur dioxide is passed through water that contains litmus. Which row states, and gives the reason for, what happens to the litmus?

• Ait turns blue; sulfur dioxide is a basic oxide
• Bit turns blue; sulfur dioxide is an acidic oxide
• Cit turns red; sulfur dioxide is an acidic oxide
• Dit turns red; sulfur dioxide is a basic oxide