A small amount of hot, concentrated sulfuric acid is added separately to solid samples of potassium halides, $\text{KX}$. Which of the potassium halides reacts to form a mixture of products that includes a halogen, $\text{X}_2$?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct