In part A of this experiment (corrosion), how is reduction of oxygen (O 2 ) detected?

Question

In part A of this experiment (corrosion), how is reduction of oxygen (O 2 ) detected?

Answer

A blue colour in the test tube indicates a site where reduction of O 2  is occurring.

Answer

A pink colour in the test tube indicates a site where reduction of O 2  is occurring.

Answer

The presence of bubbles in the test tube indicates a site where reduction of O 2  is occurring.

Answer

There is no way to detect reduction of O 2  in this experiment.

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