___is used to separate a mixture containing water and benzene.

Step 1 Explanation:

• A separating funnel is a funnel used to separate liquids that are immiscible.
• Immiscible liquids are those that do not mix with one another.
• A separating funnel is used to separate two immiscible liquids, for example: oil and water.

Step 2 conclusion:

• Water is a polar and benzene is a non-polar are also immiscible to each other, as like dissolves like.
• A separating funnel is used to separate a mixture containing water and benzene.