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Which of the following is not a surface active solute?

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in Fermentation Technology by (72.1k points)
Which of the following is not a surface active solute?

(a) Alcohol sulfates

(b) Alkylbenzene sulfonates

(c) Phosphoric acid esters

(d) Halogen salts

This question was addressed to me during an online exam.

My question is taken from Aeration and Agitation in chapter Aeration and Agitation of Fermentation Technology

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The correct answer is (d) Halogen salts

The explanation: Surface active solutes or surfactants are the substances that are used to lower the surface tension of the medium in which it gets dissolved. They also do not allow the gas bubbles to coalesce and therefore increases the interfacial area. This leads to an increase in KLa. Examples are alcohol sulfates, phosphoric acid salts, etc.

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