MCQ Quiz on Separating Mixtures

What does it mean if two liquids are immiscible?

• They dissolve completely in each other

• They do not mix and form separate layers

• They form a uniform mixture

• They can only be separated by distillation

Which apparatus is used to separate immiscible liquids?

• Separating funnel

• Burette

• Condenser

• Pipette

What happens when oil is mixed with water?

• Oil dissolves in water

• Water dissolves in oil

• They form separate layers, with oil on top

• They form a uniform solution

Which of the following is an example of miscible liquids?

• Water and oil

• Water and ethanol

• Mercury and water

• Sand and water

What method is used to separate miscible liquids?

• Filtration

• Fractional distillation

• Evaporation

• Sublimation

Why does fractional distillation work for separating miscible liquids?

• Because different liquids have different densities

• Because different liquids have different boiling points

• Because some liquids are magnetic

• Because some liquids evaporate faster than others

What happens when a mixture of ethanol and water is heated during fractional distillation?

• Water evaporates first because it has a lower boiling point

• Ethanol evaporates first because it has a lower boiling point

• Both evaporate at the same time

• Ethanol remains in the distillation flask

What is the purpose of the fractionating column in fractional distillation?

• To filter impurities

• To increase the efficiency of separation

• To heat the liquid

• To cool the gas

At what temperature does ethanol boil?

• 50°C

• 78°C

• 100°C

• 120°C

What is one common industrial use of fractional distillation?

• Separating blood plasma

• Purifying drinking water

• Separating crude oil into useful products

• Filtering sea water