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Which of the following is also known as a chemically active extraction?

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in Food Processing Unit Operations by (110k points)
Which of the following is also known as a chemically active extraction?

(a) Liquid/ liquid

(b) Liquid/ soild

(c) acid/base

(d) Gas/gas

The question was asked in a job interview.

I would like to ask this question from Contact Equilibrium Separation Process topic in section Contact Equilibrium Separation Process of Food Processing Unit Operations

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Right option is (c) acid/base

To explain I would say: There are three types of extractions; i. Liquid in liquid, ii. Liquid in solid, and iii. Acid in base Acid in base type of extraction is also called as chemically active extraction.

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