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
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
K2O + H2O → 2KOH
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