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5 . What is the principle of cross - current extraction? - A . The same solvent is used in each stage, with fresh solvent

5. What is the principle of cross-current extraction?
- A. The same solvent is used in each stage, with fresh solvent for each new stage.
- B. The feed moves in the opposite direction to the solvent.
- C. The feed and solvent are mixed together in a single container.
- D. The solvent is recycled in each stage.
6. What is the main advantage of co-current extraction?
- A. Higher purity of the final extract
- B. Lower solvent usage
- C. Easier phase separation
- D. Faster equilibrium attainment
7. In counter-current extraction, what is the direction of solvent flow compared to the feed?
- A. The same direction
- B. The opposite direction
- C. Perpendicular
- D. No specific direction
8. What is the main benefit of using a multistage extraction process over a single-stage process?
- A. It requires less solvent.
- B. It achieves higher purity of the extract.
- C. It is faster.
- D. It requires less energy.

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