Which of the following pairs of liquids are miscible in all proportions?
Question 3 options:
ethanol and oil
ethanol and water
gasoline and water
All of the above
The pair of liquids that are miscible in all proportions is ethanol and water.
To determine which pairs of liquids are miscible in all proportions, we need to understand the concept of miscibility. Miscibility refers to the ability of two substances to mix and form a homogeneous solution.
To answer this question, we can examine the nature of each pair of liquids:
1. Ethanol and oil: Ethanol is soluble in most oils, meaning it can mix with them in certain proportions. However, this mixture is not miscible in all proportions, as there are limits to the amount of ethanol that can dissolve in oil.
2. Ethanol and water: Ethanol and water are miscible in all proportions. They can mix freely and form a homogeneous solution regardless of the amounts of each liquid present. This is why ethanol is commonly used as a solvent in various water-based products.
3. Gasoline and water: Gasoline and water are immiscible. They do not mix easily and form separate layers instead. This is due to the difference in polarity between gasoline (which is nonpolar) and water (which is polar).
Based on the explanations above, only the pair "ethanol and water" is miscible in all proportions. Therefore, the correct answer is option 2: ethanol and water.