Answer: C.
Explanation: Alcohol floats on oil and water sinks in oil. Water, alcohol, and oil layer well because of their densities, but also because the oil layer does not dissolve in either liquid. The oil keeps the water and alcohol separated so that they do not dissolve in one another. ... Water sinks because it is more dense than oil.
Answer
Sounds travel slowest in gasses so it would be air
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Hydroxide ion is a strong and would react with H+ to form water
OH-+H+---->H2O
