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JEE Main levelOne or more correct optionsDifficulty 2 of 3sc136

Which statements about dialysis are correct?

  1. AThe membrane lets ions and small molecules pass but holds back colloidal particles
  2. BApplying an electric field across the membrane can speed it up
  3. CIt is the principle of the artificial kidney (haemodialysis)
  4. DThe membrane lets colloidal particles pass freely but holds back the ions

Answer: A, B, C

Dialysis uses a membrane with pores that pass small species but not colloidal particles. An applied field (electrodialysis) accelerates ion removal, and haemodialysis removes urea and salts from blood. The statement that colloids pass but ions do not is the reverse of the truth.
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