When a test solution is acidified with excess dilute nitric acid and then a few drops of aqueous silver nitrate added. If an iodide ion is present, then:
A white solution would be formed.
A pale-yellow or cream precipitate would be formed.
A white precipitate would be formed.
A yellow precipitate would be formed.
Group 17 elements are called halogens because:
They are unreactive.
The are diatomic molecules.
They combine indirectly with most metals to form salts.
They combine directly with most metals to form salts.
