Question 2 It is observed that when dull, grey magnesium is placed in acid, bubbles stream from the metal and the temperature rises. In this process, the acid is a(n) oxidizing agent and the magnesium undergoes oxidation .    The oxidation number for magnesium changes from -2 to +2 .  Answer 1: oxidizing agent Answer 2: oxidation Answer 3: -2  Answer 4: +2

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