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Which of the aqueous solutions with the pH values below will liberate hydrogen when it...

Chemistry
JAMB 1997

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

  • A. 13.0
  • B. 7.0
  • C. 6.5
  • D. 3.0
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Correct Answer: Option D
Explanation

pH 13 is strongly basic, pH 7 is neutral, pH 6.5 is slightly acidic but not as strong enough to react vigorously with Mg. However, a pH of 3.0 is sufficiently acidic to react with magnesium and produce hydrogen gas.

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