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Magnesium strip in beaker of dilute HCL?

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Place a magnesium strip in a beaker of dilute hydrochloric acid. Observations : Dirty grey magnesium strip turned into a silvery magnesium strip. Bubbling of colourless gas.

Questions : What is the dirty grey coating? Why did it react? What is the colourless gas?

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  1. The dirty grey coating may be the oxide.

    Mg2+ is located higher than H+ in the electrochemistry series, as Mg2+ is more electropositive than H+.

    The colourless gas may be hydrogen gas.

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