In part B of this experiment (reactions of metals with hydrochloric acid), how is reduction of H + detected?

Question

In part B of this experiment (reactions of metals with hydrochloric acid), how is reduction of H +  detected?

Answer

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

Answer

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

Answer

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

Answer

There is no way to detect reduction of H +  in this experiment.

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