Colour of the solution when \( K I \) reacts with \( B r_{2} \) is:
pale yellow
reddish-brown
black
none of the above
Correct answer: pale yellow
Solution
When bromine reacts with potassium iodide, iodide ions are oxidized to iodine. In solution, iodine gives a pale yellow to brownish color depending on concentration, and here the expected observation is pale yellow.