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Which one of the following impurities pr...

Which one of the following impurities present in colloidal solution cannot be removed by electrodialysis?

A

Sodium chloride

B

Potassium sulphate

C

Urea

D

Calcium chloride

Text Solution

Verified by Experts

The correct Answer is:
C
Electrodialysis involves movement of ions towards oppositely charged electrodes.
Urea being a covalent compound does not dissociate to give ions and hence it cannot be removed by electrodialysis. However all the other given compounds are ionic which can undergo dissociation to give oppositely charged ions and thus can be separated.
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