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The reaction Mg + 2HCl → MgCl₂ + H₂ shows magnesium:

The reaction Mg + 2HCl → MgCl₂ + H₂ shows magnesium:
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  • A Acting as catalyst
  • B Decomposing rapidly
  • C Forming oxygen gas
  • D Replacing hydrogen
Correct Answer: Option D
Explanation:
Magnesium is more reactive than hydrogen, so it replaces hydrogen from hydrochloric acid to form magnesium chloride and hydrogen gas.

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