JEE Main levelSingle correct optionDifficulty 2 of 3sc130
Which statement about electrodialysis is correct?
AIt is used mainly to remove non-ionic impurities such as sugar
BAn electric field applied across the membrane speeds up the removal of ionic impurities from a sol
CThe electric field forces the colloidal particles through the membrane pores
DIt does not require any membrane
Answer: B
In electrodialysis, electrodes are placed on either side of the dialysis bag. The field drives the ions of the electrolyte impurities out faster than simple diffusion. It needs a membrane and is useful only for ionic impurities.