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The separation limit for a membrane is determined by the lowest ___________ that can be separated.

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The separation limit for a membrane is determined by the lowest ___________ that can be separated.

(a) Fractional weight

(b) Molecular weight

(c) Ion weight

(d) Mass

The question was posed to me in exam.

This question is from Membrane Filter topic in chapter Building Blocks of Dairy Processing of Dairy Engineering

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Right option is (b) Molecular weight

Easiest explanation: Membranes with a definite separation limit separate everything with a definitely lower molecular weight, while membranes with a diffuse limit let some material with a higher molecular weight through and stop some with a lower molecular weight.

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