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Give a chemical explanation for each of the following: (a) When calcium metal is added to a sulfuric acid solution, hydrogen gas is generated. After a few minutes, the reaction slows down and eventually stops even though none of the reactants is used up. Explain (b) In the activity series, aluminum is above hydrogen, yet the metal appears to be unreactive toward hydrochloric add. Why? (Hint: Al forms an oxide.
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