Which one of the following impurities present | vedclass

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(C) Electrodialysis involves the movement of ions towards oppositely charged electrodes under the influence of an electric field.Urea $(NH_2CONH_2)$ i

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Urea

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(C) Electrodialysis involves the movement of ions towards oppositely charged electrodes under the influence of an electric field.Urea $(NH_2CONH_2)$ is a covalent compound and does not dissociate into ions in an aqueous solution.Since it does not form ions,it cannot be moved by an electric field and thus cannot be removed by electrodialysis.In contrast,$NaCl$,$K_2SO_4$,and $CaCl_2$ are ionic compounds that dissociate into ions ($Na^+$,$Cl^-$,$K^+$,$SO_4^{2-}$,$Ca^{2+}$) and can be easily removed by this process.

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

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