Final answer:
The correct titrant for titrating a colorless solution of hydrogen peroxide is potassium permanganate (KMnO4), which serves as the oxidant in a redox reaction and indicates the endpoint when a faint permanent pink color appears.
Step-by-step explanation:
A colorless solution of hydrogen peroxide is usually titrated with potassium permanganate (KMnO4). When hydrogen peroxide is titrated, we are generally observing a redox reaction where the permanganate ion (MnO4-) in an acidic medium serves as the oxidant, turning from purple to colorless when reduced. In the given set of options, potassium permanganate is the correct titrant for the titration of hydrogen peroxide.
In these scenarios, one typically looks for a change in color that indicates the endpoint of the titration. With KMnO4 as the titrant, the endpoint is reached when a faint permanent pink color appears, indicating the presence of a slight excess of potassium permanganate.
This is supported by the information provided that illustrates the types of substances that potassium permanganate can oxidize, and also by how the endpoint is detected when using MnO4¯ as a titrant. Therefore, the answer to the question is c) Potassium permanganate (KMnO4).