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Which of the following compounds dissolves in water to give an alkaline solution?

Chemistry
WAEC 2000

Which of the following compounds dissolves in water to give an alkaline solution?

  • A. Ammonium chloride
  • B. Sodium chloride
  • C. Sulphur (IV) oxide
  • D. Potassium oxide
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Correct Answer: Option D
Explanation

When potassium oxide (K2O) reacts with water (H2O), it produces potassium hydroxide (KOH):

  • Chemical equation: K2O + H2O → 2KOH
  • The reaction produces a hydroxide compound because the potassium ion balances the hydroxide ion and the solution is alkaline because of the high level of hydroxide ions, which gives it a high pH.   Therefore, the correct answer is option D
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