7. What substances studied are used as disinfecting agents?
8. What is meant by the statement that hydrochloric acid is one of the strongest acids?
9. What is the meaning of the phrase aqua regia?
10. Cl2O is the anhydride of what acid?
11. A solution of hydriodic acid on standing turns brown. How is this accounted for?
12. How can bromine vapor and nitrogen peroxide be distinguished from each other?
13. Write the equations for the reaction taking place when hydriodic acid is prepared from iodine, phosphorus, and water.
14. From their behavior toward sulphuric acid, to what class of agents do hydrobromic and hydriodic acids belong?
15. Give the derivation of the names of the elements of the chlorine family.
16. Write the names and formulas for the binary acids of the group in the order of the stability of the acids.