Which of the following statements about sulfur dioxide are correct? 1. Sulfur dioxide decolourises acidified potassium manganate(VII). 2. Sulfur dioxide is produced when acids react with carbonates. 3. Sulfur dioxide is used as a bleaching agent. 4. Sulfur dioxide can be used to treat acidic soil.
- A1 and 3
- B1 and 4
- C2 and 3
- D2 and 4