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When magnesium reacts with dilute acid, it produces hydrogen gas as a product of the reaction. The sound produced during this reaction is a result of the rapid release of this hydrogen gas. The reaction can be vigorous, especially with more concentrated acids, which can lead to a significant amount of gas being released quickly.

This results in a noticeable sound, often described as a "big pop." The pop is not a small or muted sound because the volume of gas that escapes can create a sharp, loud noise. The quick expansion and compression of the gases contribute to the intensity of the sound, making it more pronounced compared to quieter reactions.

Understanding the nature of the reaction and the properties of the gases involved clarifies why this particular sound is associated with the reaction of magnesium and dilute acid.