Which options are examples of non-oxidizing corrosion inhibitors?

Non-oxidizing corrosion inhibitors are substances that help prevent corrosion without undergoing oxidation themselves. They work by forming a protective film on the metal surface or by neutralizing corrosive agents in the environment.

The selection of Tungstate and Phosphate falls into the category of non-oxidizing corrosion inhibitors. Tungstate ions contribute to corrosion protection by adsorbing on metal surfaces and forming a passivating layer, which can reduce the rate of corrosion. Similarly, phosphates can effectively inhibit corrosion by forming a protective layer that shields the underlying metal from external corrosive elements.

In contrast, the other choices include compounds that are either oxidizing or do not function primarily as non-oxidizing inhibitors. Understanding how each of these substances interacts with metals and their environments is crucial in determining their effectiveness as corrosion inhibitors.