Question

Starch iodide paper is used to test for the presence of :

• A. iodine
• B. iodide ion
• C. oxidising agent
• D. reducing agent

Answer 1

Answer: (C)

oxidising agent

This test paper allows the quick and easy detection of strong oxidizers such as nitrite and free chlorine.
Potassium iodide starch paper is also used to control diazotization reactions. Nitrite or free chlorine oxidize potassium iodide to form elemental iodine which reacts with starch to a blue-violet complex. Potassium iodide starch paper may be used by dipping it into the sample or by applying drops of the sample onto the paper.