Which statement is true about miscible liquids in general?

Which statement is true about miscible liquids in general?

• A. They always separate into layers.
• B. They form a single homogeneous phase when mixed.
• C. They react to form a new chemical compound.
• D. They evaporate immediately.

Answer: (B)

When two liquids are miscible, they can mix in any proportion to form one uniform, single phase. This means there’s no distinct boundary between the liquids after mixing—the mixture behaves as a single solution. For example, water and ethanol mix completely to give a homogeneous liquid whose properties vary smoothly with composition. This focuses on a physical property: the liquids dissolve in each other rather than separating into layers. They do not need to react chemically to form a new compound just because they mix. So the idea that they always separate into layers is incorrect for miscible pairs, nor is it about immediate evaporation—evaporation depends on vapor pressures and temperatures, not on miscibility.

When two liquids are miscible, they can mix in any proportion to form one uniform, single phase. This means there’s no distinct boundary between the liquids after mixing—the mixture behaves as a single solution. For example, water and ethanol mix completely to give a homogeneous liquid whose properties vary smoothly with composition.

This focuses on a physical property: the liquids dissolve in each other rather than separating into layers. They do not need to react chemically to form a new compound just because they mix. So the idea that they always separate into layers is incorrect for miscible pairs, nor is it about immediate evaporation—evaporation depends on vapor pressures and temperatures, not on miscibility.